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I O N M A N U A L

1M INTERFACE

I N S T R U C T

EF-

tems.

2002 Clear-Com Intercom SystemsAll Rights Reserved

Part Number 810282 Rev. A

Clear-Com Intercom Systems 4065 Hollis StreetEmeryville, CA 94608-3505U.S.A

Clear-Com is a registered trademark of Clear-Com Intercom Systems.The Clear-Com Logo is a registered trademark of Clear-Com Intercom SysMatrix Plus is a registered trademark of Clear-Com Intercom Systems. RTS is a registered trademark of Telex Communications, Inc.Fiber Options is a registered trademark of Fiber Options, Inc.

i

1-1

2-12-1

el to a Matrix Frame Port 2-1el to 4-Wire Audio 2-3

2-7rs 2-9

3-13-1

atrix Port 3-1odem 3-2-TW Equipment 3-5

3-53-6

E F - 1 M I N T E R F A C E

CONTENTSQUICK START

OPERATIONDescription

Connecting a Party-Line ChannConverting a Party-Line Chann

Front Panel ControlsRear Panel Settings and Connecto

INSTALLATIONConnecting the EF-1M Interface

Connecting the EF-1M to a MConnecting the EF-1M to a MConnecting the EF-1M to RTSOther Connections

Levels


Nulling 3-73-8

ng 3-93-10

4-14-14-24-4

5-15-15-65-75-8

6-1

7-1

i i

Adjusting the NullTroubleshooting Tips for Nulli

Internal Adjustments

TRANSMISSION METHODSDirect ConnectionFiber-OpticOther Methods

MAINTENANCETroubleshooting TipsBlock DiagramComponent LayoutBill of Materials

GLOSSARY

SPECIFICATIONS

i i i

8-18-28-38-3


CLEAR-COM LIMITED WARRANTYFactory ServiceWarranty RepairNon-Warranty Repair

i v

1 - 1

r any damage that may have occurred during

el to a convenient surface, such as the bottom of the

a Clear-Com Matrix (MX+3, MX+2) frame port, RJ-45 connector on the EF-1M rear panel to the

DB-15 connector on the EF-1M’s rear panel to the optic, direct connection to another EF-1M, etc.). n assignments, including selection of Clear-Com or

anufacturer’s recommendations for cable type.

ccording to Table 1 in Chapter 2.

systems at each location to the 3-pin XLR on each

nnection, or if the Matrix Direct mode switch is on, it’s front panel will illuminate steadily.


QUICK START1. Unpack the unit(s) and inspect fo

shipping.2. Attach the connection diagram lab

EF-1M unit. 3. To connect the EF-1M directly to

connect an RJ-45 cable from the Matrix port. For all other connections, wire theother interfaces being used (fiber-Take care to wire to the correct piRTS-type operation. Follow the m

4. Set the rear-panel mode switches a5. Repeat for each location. 6. Connect the respective party-line

EF-1M’s back panel. 7. If there is a proper RS-422 data co

the amber LED on the EF-1M un

Follow these instructions

to quickly get the

system up and running.

1

1 - 2

8. Plug in the test earpiece and set the null for each location using the procedure n Chapter 3. Adjust the null on other stations and

ach location as described in “Levels” in Chapter 3.


described in “Adjusing the Null” ibeltpacks if required.

9. Adjust send and receive levels at e

2 - 1

m Intercom Systems product.

Interface is a flexible and powerful tool for stations together over various 4-wire transmission onnect a 2-wire intercom system directly to a me port.

etter understand the EF-1M Interface. For , contact your dealer, distributor, or Clear-Com service people are ready to help.

NEL TO A MATRIX FRAME PORTnnel of standard or TW party line directly to a me port, allowing the party-line intercom to be


OPERATION

Thank you for choosing this Clear-Co

The EF-1M 4-Wire and Matrix Directconnecting 2-wire intercom systems ormedia. The EF-1M Interface can also cClear-Com Matrix (MX+3, MX+2) fra

Please read this manual completely to bquestions not addressed in this manualdirectly. Our applications support and

DESCRIPTION

CONNECTING A PARTY-LINE CHANAn EF-1M Interface can connect a chaClear-Com Matrix (MX+3, MX+2) fra

EF-1M units connect

2-wire intercom stations

or systems together

over various

transmission media.

2


located at quite a long distance from the Matrix frame. At the same time, the EF-1M 20-kHz call signal to the Matrix.

rix as a Clear-Com CCI-22 Interface. It provides the ce with the following exceptions:

nnel.

Hz call signal protocol.

nd does not require an interface frame.

from the party-line connection.

party-line channel to a Matrix intercom

Intercom EF-1M

3 RJ-45

RJ-45

Matrix

2 - 2

interfaces a DC-voltage call signal or

The EF-1M is recognized by the Matsame function as the CCI-22 Interfa

• the EF-1M supports only one cha

• the EF-1M also supports the 20-k

• the EF-1M is a stand-alone unit a

NOTE: The EF-1M must be powered

Figure 1: Connecting a

3

3

= Male 3-Pin XLR

= Female 3-Pin XLR

Party-Line

3 3

3

2 - 3

EL TO 4-WIRE AUDIO of standard or TW party line to 4-wire audio ltage call signal or 20-kHz call signal to RS-422 can then be sent to a fiber-optic converter d-pair (UTP) cable such as Category 3, 5, or llent stand alone 2-wire to 4-wire converter. In sed in pairs, because once the signal is converted m, it must be reconverted to 2-wire mode to or station at the other end of the line. The from the local party-line connection on pin 2 of onducted between EF-1M units, so each EF-1M shown in Figure 2.

Each EF-1M unit must be powered by an intercom line

3

3

= Male 3-Pin XLR

= Female 3-Pin XLR

EF-1Mer Modems Party-Line Intercom

at 3 or Cat 5wisted Pair

3DB15 3 3


CONVERTING A PARTY-LINE CHANNThe EF-1M Interface converts a channeland, at the same time, converts a DC-vodata. This 4-wire audio and RS-422 data(modem); over copper, unshielded twisteabove; or it can simply be used as an excemost cases though, EF-1M units will be uto go over the chosen transmission mediuproperly connect to the party-line systemEF-1M obtains its DC operating currentthe XLR connector. This current is not cmust be powered by an intercom line as

Figure 2:

Party-Line Intercom EF-1M Fib

CT

3 DB153 3

3

The EF-1M converts standard or TW party line to 4-wire audio and, at the same time, converts a DC-voltage call signal or 20-kHz call signal to RS-422 data.


Call signaling can serve as more than simply a visual indicator. A call signal can activate connected Clear-Com equipment. The Clear-Com d KB-212 Speaker Station use this feature. Imagine a fiber-optic system over a 1-kilometer fiber as shown ber there is another EF-1M unit and PL system with W-40 Interface. The EF-1M allows the people on ith the people on the walkie-talkies over a kilometer ing transmit or receive operation.

3: Interfacing two party-line systems over a kilometer of fiber

interface all refer to devices that convert one type of different type of signal.

EF-1Modems TW-40PK-5

BaseWalkieTalkie

RemoteWalkieTalkies

3DB15 3 3 3 DB9

2 - 4

relays and trigger functions in other TW-40 Two-Way Radio Interface anparty-line (PL) system connected to ain Figure 3. At the other end of the fiwalkie-talkies interfaced through a Tthe first PL system to communicate wof fiber, with the call signal determin

Figure

NOTE: The terms modem, codec, andsignal for transmission or reception to a

3

3

= Male 3-Pin XLR

= Female 3-Pin XLR

Party-Line Intercom EF-1M Fiber M

3 3

3

3 DB15

Call signaling can serve

as more than merely a

visual indicator.

2 - 5

Because of the EF-1M’s low profile and compact size, it can function either as a nted on utility rack shelves. Up to three units will fit of space and will offer sufficient vertical clearance to methods. While the EF-1M may be used as a erface with excellent results, it is uniquely equipped h of the discussion in this manual address the issues

y of the EF-1M, more than a single pair of EF-1M tions to a single channel.

scenario: The three Channel A ports of an MS-232 n EF-1M. (For an illustration, see Figure 4.)

ted to a fiber-optic modem and sent through fiber to unit, and party-line system at the three remote ow sharing the same channel, linked through fiber, nel. While the nature of 2-wire to 4-wire hybrids

external 2-wire party lines that can be combined, six properly nulled, should generally provide a stable

a wide variety of third-party systems and devices, it bles of setups and transmission methods. The key


stand-alone device, or it can be mouhorizontally in one-rack unit (1RU) accommodate a variety of mountingsingle-ended 4-wire-to-party-line intto work in point-to-point pairs. Mucof operation in this latter mode.

Due to the superior nulling capabilitunits can be used to link various loca

As an example consider the followingmain station are each connected to a

Each of those three is in turn connecanother fiber-optic modem, EF-1M destinations. All four locations are nwith a total of six “nulls” on the chanmay limit the maximum number of EF-1M units on a common channel,system.

Because the EF-1M will be used withis not possible to address all the varia

Because of the EF-1M’s

low profile and compact

size, it can function as a

stand-alone device, or it

can be mounted on

utility rack shelves.


point is that the modem, multiplexer, or converter for the transmission medium (the e DB-15) must accept line-level (-15 dBV to +4 sired, RS-422 data.

ink various locations to a single channel

EF-1MPK-5

3DB15 3 3

EF-1MPK-5

3DB15 3 3

EF-1M

3DB15

3

3

Party-Line Intercom

3

2 - 6

system that the EF-1M connects to via thdBV) 4-wire audio and, if call signal is de

Figure 4: Six EF-1M units l

EF-1M

3 DB15

EF-1M

3 DB15

3

3

= Male 3-Pin XLR

= Female 3-Pin XLR

Party-Line Intercom EF-1M Fiber Modems

3 3 3 DB153

2 - 7

S

Figure 5: Front panel of an EF-1M unit

level from the local 2-wire intercom (the system io out of the 4-wire I/O. This control has a range of

al level from the audio in of the 4-wire I/O to the as a range of ±12 dB.


FRONT PANEL CONTROL

Local Send controls the audio signalconnected to this EF-1M) to the aud±12 dB.

Local Receive controls the audio signlocal 2-wire intercom. This control h

M

You adjust sidetone and

volume “listen levels”

with the EF-1M’s front

panel controls.


Sidetone Null Adjustment This set of three trimpots includes R=Resistance, These compensate for each component of the line ossible. To prevent damage to the level control and past their stop points.

minate when the EF-1M is receiving power from pin

r modes. The first three relate to call signal data. has been established with a remote EF-1M unit, or selected at the local EF-1M unit. at the local EF-1M unit. nection at the local EF-1M unit, but a “break” n the modems used, this can indicate a problem at

eadphone has been plugged into the test tone jack at est tone is on.

he LED is steadily illuminated. Audio is still

2 - 8

L=Inductance, and C=Capacitance. impedance, providing the best null pnulling trimpots, do not force them

Power LED This green LED will illu2 of the party-line XLR connection.

Data LED This amber LED has fou1. ON- Either a successful data link

the Matrix Direct mode has been 2. OFF- There is no data connection3. RAPID BLINK- There is data con

condition is present. Depending othe remote end.

4. SLOW BLINK- A test earbud or hthe local EF-1M and the nulling t

Call signals will not transmit unless ttransceived by a connected unit.

2 - 9

AND CONNECTORS

Figure 6: Rear panel of an EF-1M unit

f the EF-1M work independently of each other. tor settings for use with either 4-wire fiber (the ON FF position).

tor intercom levels for use with either Clear-Com S-TW equipment (the ON position). Table 1 .

Intercom

Call Via RS-422 Data

4-WireAudio


REAR PANEL SETTINGS

Mode-Switch Settings

The two switches on the rear panel oSwitch 1 adjusts the EF-1M’s connecposition) or a matrix intercom (the O

Switch 2 adjusts the EF-1M’s connecequipment (the OFF position) or RTsummarizes the mode switch settings

CC/TWMatrix Direct

Matrix


Table 1: EF-1M’s mode-switch settings

O)

’s back panel connects to the 2-wire party line. se a high quality “Y” cable like the Clear-Com

st have one, but only one, termination. (See Figure

e (OFF), the DB-15 connects to additional -1M). Two pins each are dedicated to audio in,

LT) ON

nects to er

RJ-45 connects to Matrix directly

ds/receives all, C-C evel

DB-15 sends/receives 20-kHz Call, RTS-TW Intercom Level

2 - 1 0

3-Pin XLR Connector (Party Line I/

The female 3-pin XLR jack on the EF-1MIf a loop-through connection is needed, uSP-3.

NOTE: Each (local) party-line channel mu7 on page 3-4.)

DB-15 Connector When mode-switch 1 is set to 4-wire modinterfaces or converters (or to another EFaudio out, data in, and data out.

OFF (DEFAU

MODE-SWITCH 1 RJ-45 con4-Wire/Fib

MODE-SWITCH 2 DB-15 senC-C DC CIntercom L

2 - 1 1

Shorting pins 8 and 15 together, or setting mode-switch 2 to ON adjusts the unit to of DC voltage and adjusts audio levels for

and data shields if present in the wiring.

x Direct mode (ON), the RJ-45 connects to the


respond to 20-kHz call signal insteadconnection to RTS TW lines. There are also connections for audio

RJ-45 ConnectorWhen mode-switch 1 is set to MatriMatrix frame.


INTERFACE

MATRIX PORTClear-Com Matrix (MX+3, MX+2) frame port:

ode-switch 1 to the ON position.except when the unit is being nulled.

e cable from the RJ-45 Matrix connector on the rt (RJ-45) on the Matrix frame. 2-wire intercom line. When the EF-1M is receiving t as a CCI-22 Two-Wire Interface.

efer to the PGM-WIN Configuration Program

3 - 1

INSTALLATION

CONNECTING THE EF-1M

CONNECTING THE EF-1M TO A To connect the EF-1M directly to a

1. On the EF-1M’s back panel, set mThe Data LED will remain ON,

2. Connect a CAT-3, CAT-5, or abovback panel of the EF-1M to a poThe EF-1M is powered from the power, the Matrix will recognize i

3. Program the Matrix frame port. RManual for instructions.

You can connect an

EF-1M unit directly to a

Clear-Com Matrix

frame port.

3

3 - 2

Note that when the EF-1M is set to Matrix Direct mode (mode-switch 1 ON), the fect. The transmission rate is automatically set to the ix communication.

1M’s rear panel to the ON position, the 20-kHz call adjusted for connection to RTS-TW lines. If you set the DC voltage call signal is selected and line levels

connector on the EF-1M’s back panel will also st audio levels for connecting to RTS-TW lines. ode-switch 2 to the OFF position.

MODEM M to a fiber-optic modem is to wire the DB-15 jack

hat modem.

minal blocks, XLR jacks, or co-axial connectors. air cable may be required. Check the operations ed, twisted-pair cable (UTP), Category 3, 5, or e distance limitations specified by the modem’s


internal baud rate jumpers have no ef19.2 kilobaud rate required for Matr

If you set mode-switch 2 on the EF-signal is selected and audio levels are mode-switch 2 to the OFF position,are optimized for Clear-Com.

Shorting pins 8 and 15 of the DB-15select the 20-kHz call signal and adjuWhen you short pins 8 and 15, set m

CONNECTING THE EF-1M TO A The first step in connecting the EF-1to the appropriate connector(s) for t

The modem’s connectors may be terFour-pair twisted cable or shielded-pmanual for the modem. For unshieldhigher is acceptable if used within thmanufacturer for this application.


The four pairs of cable used for full operation include one each for audio in and audio out data out.

5 pins correctly. For added reference, the illustration out configuration. A stick-on label with the pinout e user’s convenience. Attach this in a convenient

priate connectors, follow these steps to connect the

el to the EF-1M’s rear-panel 3-pin XLR connector. eiving power by checking the green Power LED (the F-1M properly connected at the other end of the LED should also illuminate within a second or two. dshake” between the two units. t is received at the distant intercom system. levels as required. in the system.

3 - 3

and one each for RS-422 data in and

Take care to wire the DB-15 or RJ-4on page 3-4 (Figure 7) shows the pinassignments has been included for thlocation.

After wiring the DB-15 to the approEF-1M to a modem: 1. Connect the local party-line chann2. Check to see that the EF-1M is rec

“on” light). If there is a powered Etransmission line, the amber DataThis confirms a proper data “han

3. Send a call signal and check that i4. Adjust nulls, and then check audio5. Repeat as necessary for each EF-1M

3 - 4

Figure 7: Connector Pinout Configurations

12

9

3

10

4

11

5

12

6

13

7

14

8

15

- RS-422 Local Receive- RS-422 Local Transmit+ RS-422 Local Receive+ RS-422 Local Transmit

RS-422 Receive ShieldRS-422 Transmit Shield

4-Wire Audio Input Shield4-Wire Audio Output Shield

- 4-Wire Audio Input to Party Line- 4-Wire Audio Output from Party Line

+ 4-Wire Audio Input to Party Line+ 4-Wire Audio Output from Party Line

(Not Used)

Jump for TWOpen for C-C

4-Wire Audio / Data


+ 30 VDC Power

Intercom GroundIntercom Line

XLR-F

1

3

2

Intercom LineMatrix RJ-45

+ Matrix RS-422 from EF-1M

1 2 3 4 5 6 7 8

- Matrix RS-422 from EF-1M+ Matrix Audio from Party Line

+ Matrix Audio to Party Line

- Matrix Audio to Party Line- Matrix Audio from Party Line

+ Matrix RS-422 to EF-1M

- Matrix RS-422 to EF-1M


S-TW EQUIPMENTuipment you can either set the mode switch to the vious chapter, or you can wire the DB-15 connector

y RTS-TW equipment, whichever audio channel is onnector will connect t through the DB-15. (Older nnels; therefore a pin/channel reversal would result . The audio channel carried on pin 2 of a TW line nected through the EF-1M; however, it will not be

riety of interface situations. Even if the call signal cellent 4-wire to party-line interface for use with uipment in the following situations:

nation to party line or wireless intercom

quires two EF-1M units (could be different types of

3 - 5

CONNECTING THE EF-1M TO RTTo use the EF-1M with RTS-TW eq“RTS” setting as discussed in the prespecifically for that purpose.

When used with all but the very earlwired to pin 3 of the EF-1M’s XLR cunits do not offer power on both chain no power supplied to the EF-1M)(Clear-Com or RTS) will not be connegatively affected.

OTHER CONNECTIONS An EF-1M may be used in a wide vatranslation is not required, it is an exmany types of intercom and audio eq

• Any 4-wire audio source and desti

• PL system direct to PL system. RePL on each end)

• PL system to PC sound card

3 - 6

e following “listen levels”: the sidetone and volume receive level of the local EF-1M; and the send level of

as appropriate for the external PL system and ill typically be between 10 o’clock and 2 o’clock, wire interface. If different intercom brands are used units (RTS and Clear-Com for example), the tside of the normal range. Otherwise, more extreme ewhere in the system.

e EF-1M is used with RTS-TW intercoms, as the are slightly higher than Clear-Com or compatible ear-Com may be freely mixed on a channel,

aximum number of EF-1M units able to share a and call signals are selected by jumpering together or or by setting mode-switch 2 to ON.


LEVELSEF-1M front-panel controls affect that the users’ stations or beltpacks; thethe remote EF-1M.

Adjust the PL send and receive levelslistening conditions. The controls wroughly in the 0 dBV range at the 4-on opposite ends of a pair of EF-1Mcontrols may need to be adjusted ousettings could indicate a problem els

Level settings will differ slightly if thnominal audio levels for that system systems (about 4-8 dB). RTS and Clincluding call signaling, though the mchannel may be reduced. RTS levels pins 8 and 15 of the DB-15 connect

Adjust the PL send and

receive levels as

appropriate.


or’s own voice in his or her headset or speaker. With inimize) the sidetone when external party lines are ission media. Ideally, there should be no portion of ery EF-1M sharing a channel in a system should be rred to as “hybrid null.”

e system connected to the EF-1M, not the secondary on line lengths from 2 feet to 4,000 feet (from in the range of 120–350 Ohms and can reduce local than 30 dB over the frequency range of 200 Hz–

circuitry with a test-tone generator and is shipped rphone. Plug the earphone into the 1/8 in. (3.5 mm) omatically activate the test tone (and the amber data e monitors the output of the nulling circuit. The test s and other EF-1M units on the channel, so remove

ff speakers as appropriate.

3 - 7

NULLING“Sidetone” is the sound of the operatinterfaces, it is necessary to “null” (mconnected over the secondary transmthe talk signal in the listen signal. Evnulled consecutively. Null is also refe

Null is affected by the local party-lininterface. The null circuit is effective1.64 m to1220 m) with impedances audio in the received signal by more 8 kHz.

The EF-1M includes built-in nullingfrom the factory with an accessory eajack on the front panel. This will autLED will blink slowly). The earphontone will be sent to any active stationheadsets, adjust volumes, and turn o

3 - 8

Adjusting the Null

is made once during installation. (If the system changes substantially, it may be necessary to rmance.)

vices for that channel together and to the EF-1M.e jack labeled “test.” You will now hear a steady e.ne is at its minimum.ne is at its minimum. ne is at its minimum.

h each other, you will need to repeat steps 3, 4, and 5 ing the test tone. the test tone is virtually inaudible. null cannot be obtained, is likely that there is a prob-external party line or with one of the other devices . The next section provides troubleshooting tips.

lling operation is complete.


Normally, the following adjustment configuration of the local party-line re-null the system for optimum perfo1. Connect all the local party-line de2. Plug into the front-panel earphon

200-Hz tone through the earphon3. Adjust the “R” control until the to4. Adjust the “L” control until the to5. Adjust the “C” control until the to6. Because these controls interact wit

several times before fully minimiz7. Continue these adjustments until

If a complete or almost complete lem with either the wiring of the attached to the external party line

8. Unplug the earphone when the nu


Troubleshooting Tips for Nulling ounterclockwise, the line has multiple terminations

e, then the line is unterminated.

he low frequency inductive and capacitive elements ” control is fully turned in either direction, it is likely rnal party line. With a Clear-Com party line tly to either side of the mid-pot position.

cable capacitance and is line-length dependent. If tes a very short line (<10 feet or < 3 m). This is a

tes an excessively long line (>4000 feet or >1200 m).null to/from the local party-line system. Only the 1M will affect the listen receive level at the remote

3 - 9

• If the “R” control is turned fully cor a resistive load.

• If the “R” control is fully clockwis

• The “L” control compensates for tof the external party line. If the “Lthat there is a problem in the exteconnected, the “L” should be sligh

• The “C” control compensates for fully counterclockwise, this indicavalid setting for a short line.

• If “C” if fully clockwise, this indica• Remember, you are adjusting the

transmit send level at the local EF-EF-1M.

3 - 1 0

Sting is selection of the baud rate for the RS-422 data.

422 data is 19.2 kilobits per second (19.2 kbps). For ud rate is internally selectable for 2400, 4800, or d settings are: 8 data bits; 1 stop bit; no parity.

rs inside the EF-1M requires removal of the cover.

1Medure: a #2 Phillips screwdriver, a 3/16 in. nut driver, blade width of approximately .075 in. (1.9 mm).

nit:

s on the back and sides.g tab to secure it to the housing. The jack must be moved. Use a very narrow-tipped screwdriver, like a side the XLR jack and twist the release lock ly 1/4 turn. jack screws on the DB-15.

e DB-15 and XLR jacks are clear.


INTERNAL ADJUSTMENTThe only user-adjustable internal set

The factory-set baud rate for the RS-certain transmission schemes, the ba9600 bits per second. Additional fixe

NOTE: Accessing the baud rate jumpe

Removing the cover of the EF-Three tools are required for this procand a flat-bladed screwdriver with a

To remove the cover of the EF-1M u1. Disconnect all cables.2. Remove the four sheet metal screw3. The XLR jack has a special lockin

released before the cover can be re“greenie.” Insert it into the slot incounterclockwise for approximate

4. Remove the two 3/16 in. hex-head5. Slide the cover backwards until th

You can set the baud

rate for 2400, 4800, or

9600 bits per second.


6. Lift off the cover. f jumpers P3 and P4 (shown in the following table).tion, plug it onto both pins. To set a jumper to the ne of the pins.

P3 and P4 jumper settings

ough 6.

ed to factory tune the 20-kHz call-signal detection qualified personnel.

BAUD 2 RATE

Open 19.2 kBaud

Open 9.6 kBaud

Closed 4.8 kBaud

Closed 2.4 kBaud

3 - 1 1

7. Make the necessary adjustments oTo set a jumper to the closed posiopen position, plug it onto only o

Table 2:

8. For reassembly, reverse steps 1 thr

NOTE: The potentiometer (R13) is uscircuitry. It should be adjusted only by

BAUD 1

Open

Closed

Open

Closed

Make the necessary

adjustments of jumpers

P3 and P4.

4 - 1

ETHODS

-pair cable is available for audio connections. This phone cable in or between buildings. Figure 8 ns.

Figure 8: Twisted Pair Wiring

14

13

- RS-422 Receive

+ RS-422 Receive

6

5 + RS-422 Transmit

- RS-422 Transmit

DB-15 Pins

9

10 - 4-Wire Audio Input to PL

+ 4-Wire Audio Input to PL

1

2

+ 4-Wire Audio Output from PL�

- 4-Wire Audio Output from PL�

EF-1Ming


TRANSMISSION M

DIRECT CONNECTION There are many instances where twistedwiring is typically found in unused teleillustrates twisted-pair wiring connectio

6

5+ RS-422 Transmit

- RS-422 Transmit

14

13

- RS-422 Receive

+ RS-422 Receive

DB-15 Pins

1

2

+ 4-Wire Audio Output from PL�

- 4-Wire Audio Output from PL

9

10- 4-Wire Audio Input to PL

+ 4-Wire Audio Input to PL

EF-1MTwisted Pair Wir

4


Simply connect the 4-wire audio and 4-wire data between EF-1M units utilizing this tion between the DB-15 connectors on a pair of h end of the cable will require their own power and

or better cable, and possibly more, may be used to s manner.

ber of advantages over copper:

omagnetic interference.

nd more space efficient than copper, even for a single

ses, can be substantially longer.

a fiber transmission.

on with fiber-optic equipment. Never look directly into with a unit powered up. Even if you don’t see visible o invisible light from an infrared laser. This can cause all manufacturer’s recommendations and warnings.

4 - 2

cable. This will form a direct connecEF-1M units. The PL systems at eactermination for their local channel.

Up to 5000 ft. (1.52 km) of CAT 3 connect between EF-1M units in thi

FIBER-OPTICFiber optic transmission offers a num

• There is no susceptibility to electr

• Fiber-optic cable is much lighter achannel.

• Transmission distance, in many ca

• It is more difficult to eavesdrop on

WARNING: Always use extreme cautithe light port or into a connected cablelight, you could be exposing your eyes tdamage to your vision. Always observe

Use twisted-pair

cable to connect

4-wire audio and

4-wire data between

EF-1M units.

4 - 3

There are two basic modes of fiber-optic transmission. In a multimode fiber, the light paths. In a single-mode fiber, the light travels in a ment, single or multiple channels of audio, video, exed and carried in either one or both directions. s to a popular type of multimode fiber-optic modem

Figure 9: Shielded Wiring

1

2

3

4

5

6

9

10

11

12

13

14 - RS-422 Receive

+ RS-422 Receive

RS-422 Receive Shield

4-Wire Audio Input Shield

- 4-Wire Audio Input to Party Line

+ 4-Wire Audio Input to Party Line

- RS-422 Transmit

+ RS-422 Transmit

RS-422 Transmit Shield

4-Wire Audio Output Shield

- 4-Wire Audio Output from PL

+4-Wire Audio Output from PL�

EF-1Ming


travels through the fiber via multiplesingle path. Depending on the equipdata, or a mix thereof can be multiplFigure 9 illustrates wiring connectionover shielded-pair cable.

1

2

3

4

5

6

1

2

3

4

5

6J1B J1A

Pin 1

J1A

J1B

- Data Out

+ Data Out

Ground

Audio Shield

- Audio Out

+ Audio Out

- Data In

+ Data In

Ground

Audio Shield

- Audio In

+ Audio In

Fiber Options249B-T/1B44

or249B-R/1B44

Shielded Wir


Just as with analog cable, the longer the fiber-optic cable, the more signal degradation also contribute to overall path loss. Performance is and the selected wavelength. Single-mode fibers can s, though the equipment is more costly, in part due

as the light source.

und that the FiberOptions 249B series (multimode, ingle channel applications. Range is up to 2.5 km ss at 1 km (0.62 mile) or less.

dio and RS-422 data and convert them in either or use with EF-1M units. There are a number of t meet this criteria. Selection is much more limited and audio codecs typically used with ISDN.

4 - 4

occurs. Cable splices and connectorsdependent on the modem, the cable,carry signals over much longer lengthto the use of lasers rather than LEDs

For dedicated use, Clear-Com has fosingle channel) works well for most s(1.55 miles) with negligible signal lo

OTHER METHODSAny device that can accept 4-wire audirection could be considered ideal fchoices for fiber-optic “modems” thaamong computer networking devices

EF-1M performance

is dependent upon

the modem, the

cable, and the

selected wavelength.

5 - 1

ore common problems that may occur.

Solution

ted. Check termination switches on PL equipment and set appropriately. (One termination per channel).

Check termination switches on PL equipment and set appropriately.


MAINTENANCE

TROUBLESHOOTING TIPSListed below are symptoms, causes, and solutions for some of the m

AUDIO TROUBLESHOOTING TIPS

Symptom Cause

Squealing feedback, levels too high, distortion, call signal stays on.

The local PL channel is not termina

Levels seem low even after adjustment.

The local PL channel has multiple terminations.

5


ing,

Adjust the unit(s) for the best possible null. This will help to minimize the effects.

Adjust the sidetone nulls on the party-line stations and beltpacks.

y be 1. Always begin a setup with these set to their nominal levels.

2. Reset jumper.

nd Know the performance parameters of the transmission system.

Check and correct wiring.

Solution

5 - 2

Echoes, hollow sound, resonance.

Improper nulls and/or delays introduced by digital signal processA-to-D and D-to-A conversion andother network-related processing.

Levels don’t match from one end to the other.

1. Additional level adjustments maavailable on the modems.

2. Clear-Com/RTS jumper is set incorrectly.

Excessive noise or poor frequency response.

Various causes related to modems athe network rather than to the party-line equipment.

Level adjustment controls seem to work backwards.

DB-15 is not wired correctly.

Symptom Cause

5 - 3

DATA TROUBLESHOOTING TIPS

Solution

ith

rent

ect

1. Adjust wiring.

2. Adjust EF-1M units to match.

3. Adjust EF-1M units to match.

r uses

Check modem power connections.


Symptom Cause

Data LED is off even though units are connected at each end.

1. Problem in the wiring from the DB-15 to the modem or problem wthe transmission medium.2. Baud rate or other modem requirements not compatible with EF-1M.3. The EF-1M units are set to diffebaud rates.4. One EF-1M is set to Matrix DirMode when connected to another EF-1M.

Data LED blinks rapidly. EF-1M is receiving a "break" signalfrom the RS-422. Typically a poweloss on the modem at the far end cathis.


er W e nd

1.Check PL.

2. Check wiring.

Solution

5 - 4

Call signal is locked on at one end.

1. Local PL problem.

2. DB-15 is wired incorrectly at othend. This will happen if an RTS-Tchannel is connected at one EF-1Mand a Clear-Com is connected at thother, but the DB-15 on the RTS ehas not been wired properly.

Symptom Cause

5 - 5

NULLING TROUBLESHOOTING TIPS

Solution

EF-1M units at both ends of the connection must receive power from a local PL system.

sive

n.

nel.

1. Verify operational status of PL equipment.

2. Remove EF-1M units from the network. If nulls on the remaining units improve, the problem was too many EF-1M units. This should not occur until approximately seven or more units are sharing a channel. However, as systems vary in size and complexity, a user could experience difficulty nulling as few as two EF-1M units, each connected to a very large system.


Symptom Cause

No audio; green LED is off.

EF-1M is not receiving power.

Unsatisfactory null. 1. Unstable PL system due to excescabling, a high number of stations,transformers connected across the intercom channel, or other PL equipment issues such as terminatio

2. Too many EF-1M units on chan


Figure 10: EF-1M Block Diagram

4-WireOutput

GainAdj.

20 kHz CallReceive

RS-422Send

RS-422Receive

NullingEarphone

Data

PhoneDet.

Receive

5 - 6

BLOCK DIAGRAMEF-1M

4-WireInput

Hybrid Null

GainAdj.

Microprocessor

C-C CallSend &Receive

IntercomLine

TW PowerSplitter

Power

20 kHzCall

200 HzNull

Power

Baud RateSelect

Send

C-C / TWMode

C-C / TWMode

Normal /Matrix Direct

Mode

5 - 7

11: EF-1M PCB Component Layout Drawing


COMPONENT LAYOUT

Figure


signator518 C5241691 C22 C43 C632 C6245 C40 C64-C67 C24 C26 C33 C45 C10 C299 C23 C30 C42 C472 C27 C371 C13 C17 C18 C20 88 C44 C46 C16 C50 C54 C55 6 C57

5 - 8

BILL OF MATERIALS

EF-1M PCB

CAPACITORSValue Type Volts Tol. Part# De1 uF Aluminum NP 50V 10% 150002 C3.01 uF Ceramic Disc 1.4KV 20% 150029 C6220 uF Aluminum 50V 150037 C42700 pF 2700PF PLY 50V 2.5% 150086 C14.7 uF Aluminum NP 50V 150087 C322 pF Ceramic Disc SMD 50V 5% 151116 C339 pF Ceramic Disc SMD 5OV 5% 151119 C347 pF Ceramic Disc SMD 50V 5% 151120 C2100 pF Ceramic Disc SMD 50V 5% 151124 C3150 pF Ceramic Disc SMD 50V 5% 151126 C3220 pF Ceramic Disc SMD 50V 5% 151128 C1470 pF Ceramic Disc SMD 50V 5% 151132 C9820 pF Ceramic Disc SMD 50V 5% 151135 C7.0047 uF Ceramic Disc SMD 50V 10% 151156 C8.01 uF Ceramic Disc SMD 50V 10% 151160 C1.047 uF Ceramic Disc SMD 50V 10% 151168 C1.1 uF Ceramic Disc SMD 50V 10% 151172 C1

C6.22 uF Ceramic Disc SMD 50V 10% 151176 C3..47 uF Tantalum SMD 35V 10% 151184 C6

C5

5 - 9

Value Type Volts Tol. Part# Designator9 C51 C53 C590 C58

esignatorR88

42

R79R1R7R12R10

77 R83 R91 R92 R93 R9424 R17

R4969 R72

R9516 R520 R42 R50 R5961 R8470 R54 R19 R30

R53R8 R14 R87R60R64


10 uF Tantalum SMD 25V 10% 151192 C422 uF Aluminum SMD 50V 20% 151200 C6

RESISTORS AND RESISTOR PACKSValue Power Type Tol. Part# D10 OHM 1/4 Carbon Film 5% 4100024.7K OHM 1/4 Carbon Film 5% 410013 R330 OHM 1/4 Carbon Film 5% 410061 R0 OHM 1/10 SMD 41110010 OHM 1/10 SMD 1% 41119722.1 OHM 1/10 SMD 1% 41123056.2 OHM 1/10 SMD 1% 411269100 OHM 1/10 SMD 1% 411293150 OHM 1/10 SMD 1% 411310 R332 OHM 1/10 SMD 1% 411343 R432 OHM 1/10 SMD 1% 411354475 OHM 1/10 SMD 1% 411358 R604 OHM 1/10 SMD 1% 4113681.00K OHM 1/10 SMD 1% 411389 R1.50K OHM 1/10 SMD 1% 411406 R2.21K OHM 1/10 SMD 1% 411422 R3.32K OHM 1/10 SMD 1% 411439 R4.32K OHM 1/10 SMD 1% 4114504.75K OHM 1/10 SMD 1% 4114545.62K OHM 1/10 SMD 1% 4114616.81K OHM 1/10 SMD 1% 411469


Value Power Type Tol. Part# Designator6 R21 R22 R28 R29 R35 R39 R44 R47

R8185 R68

R1146 R4152 R74

R51R34 R37 R73 R80 R89R15 R25 R36 R40

56 R58 R65 R6667 R82 R86

R57R18 R23 R27 R31

32 R33 R35 R3944 R47 R48

R3 R26 R43 R76R9 R62 R63 R90R38

DesignatorQ5IC8IC1

1 D8D4IC3 IC4 IC5 IC6

5 - 1 0

10.0K OHM 1/10 SMD 1% 411485 R14.3K OHM 1/10 SMD 1% 41150015.0K OHM 1/10 SMD 1% 411502 R19.1K OHM 1/10 SMD 1% 41151220.0K OHM 1/10 SMD 1% 411514 R22.1K OHM 1/10 SMD 1% 411518 R27.4K OHM 1/10 SMD 1% 41152733.2K OHM 1/10 SMD 1% 41153547.5K OHM 1/10 SMD 1% 411550

RR

56.2K OHM 1/10 SMD 1% 411557100K OHM 1/10 SMD 1% 411581

RR

221K OHM 1/10 SMD 1% 411614475K OHM 1/10 SMD 1% 411646562K OHM 1/10 SMD 1% 411653

DIODES AND TRANSISTORS Device Description Part#Transistor TIP30B PNP 80V 1A TO-220 PKG 480051IC 7805T POS 5V REGULATOR 480083IC RS-422 OPTO INTERFACE 480242Diode BAV70 DUAL DIODE 481019 DDiode BAW56 DUAL DIODE 481020IC 833 DUAL OPAMP... SMD 481023

5 - 1 1

Device Description Part# Designator4 Q6 Q937 D9 D108

IC7

6Q7ICT1IC2

Designator

R13 R45 R55 R71 R75 R78D11

R45 R55 R71 R75

R78R13


Transistor 2222A NPN 40V 600MA... SMD 481026 QTransistor 2907A PNP 60V 600MA... SMD 481027 QDiode BAV99 DUAL DIODE... SMD 481033 DTransistor MPSA14 DNPN 30V 300MA... SMD 481038 QIC DG444 QUAD 481050

ANALOG SWDiode 5.1V 5% ZENER 1/4W... SMD 481061 DTransistor MPSA64 DPNP 30V 500MA SMD 481075IC 567 PLL SMD 481081Transformer 600CT/600CT 560018IC ASSY, EF-1M FIRMWARE 710541

MISCELLANEOUSDevice Description Part#

JUMP JACK.1IN WITH HANDLE 210226Pot SHAFT FOR PT-10, 240103

LED T1 RT ANG PC MTG 390063GREEN/YELLOW

Pot 50K TRIMPOT PIHER#PT10WH-50K 470059

Pot 5K TRIMPOT 470063


/TIA 568 category specification relating to the are adequate for EF-1M wiring.

nd DECodes data.

rty-line system where a beltpack or station is present. p is any point on a common channel where an

erface is present.

-pair or twisted-pair cable carries audio in one

een 4-wire audio and 2-wire audio and contains a

endent systems meet and act on or communicate be a hardware connector used to link to other used to allow communication between two software transmission signals so that they are compatible.

6 - 1

GLOSSARY

Category 3, 5, 5e, or 6 cable: EIAperformance of network cabling. All

CODEC: A device that enCODes a

Drop(s): A point or points in the paFor purposes of this discussion, a droEF-1M or other 4-wire to 2-wire int

Four-wire audio: A single shieldeddirection only.

Hybrid: A circuit that converts betwnulling circuit.

Interface: The place at which indepwith each other. An interface mightdevices, or it might be a convention systems. An interface often converts

The glossary gives

definitions of

technical terms

found throughout this

manual.

6

6 - 2

The EF-1M Infterface connects 2-wire intercom systems or stations together over various so, it converts a channel of standard 2-wire or TW same time, converts a DC-voltage call signal or

at connects to an EF-1M through standard -1M Interface.

ds the programmable circuit cards which control an onnect to external intercom devices (stations, RJ-45 connectors on the back panel. Each RJ-45 om supports the Matrix Plus 3 (MX+3) and Matrix

g table gives common metric conversions.

r. A device for converting an analog signal to/from a ion and distribution over various media and

. Measurement .04 inch feet 0.62 miles


4-wire transmission media. In doingparty line to 4-wire audio and, at the20-kHz call signal to RS-422 data.

Local PL: The party-line system thmicrophone cable and powers the EF

Matrix Frame: A matrix frame holintercom system. The circuit cards cinterfaces, 4-wire audio) through theconnector is called a “port.” Clear-CPlus 2 (MX+2) software platforms.

Metric Conversions: The followin

Modem: MODulator/DEModulatodigital or optical signal for transmissnetworks.

U.S. to Metric Measurement Metric to U.S 1 inch = 25.4 millimeters 1 millimeter = 1 foot = 0.30 meter 1 meter = 3.3 1 mile = 1.6 kilometers 1 kilometer =


Null: (noun) 1. Adjustment on the intercom that controls the amount of sidetone heard etone adjustment. (verb) To adjust the amount of ator.

hich each member can both listen and speak to every gous to a telephone conference call with its full ion.

ata connection.

oice transmitted through an earphone as you speak.

on the Clear-Com party line to maintain stability.

-pair cable carrying a single channel of bidirectional

talk and listen) audio that are carried on a single

6 - 3

by the operator. 2. The degree of sidsidetone heard by the intercom oper

Party Line: Intercom channel on wother member on the channel. Analoduplex (talk and listen) communicat

PL: Abbreviation for Party Line.

RS-422: A balanced asynchronous d

Sidetone: The sound of your own v

Termination: A fixed load placed up

Two-wire audio: A single shielded(talk and listen) audio.

TW: Two channels of bidirectional (shielded-pair cable.

E F - 1 M I N T E R F A C E 7 - 1

SPECIFICATIONS

0 dBv is referenced to 0.775 V RMS

Party Line Characteristics (Clear-Com Mode)Frequency Response: 200-10 kHz ± 3 dBAudio Level: -15 dBv nominalClipping Level: +3 dBv minimumImpedance: Greater than 10k Ohms (bridging)

Party Line Characteristics (RTS Mode)Frequency Response: 200-10 kHz ± 3dBAudio Level: -10 dBv nominalClipping Level: +3 dBv minimumImpedance: Greater than 10k Ohms (bridging)

Call Signal (Clear-Com Mode)Input Threshold: 4 Volts DC on audio lineOutput Level: 11 Volts minimum on audio line

Call Signal (RTS Mode)Input/Output: 20 kHz

Nulling CapabilityDepth of Null: >30 dB, 200 Hz–8 kHzLine Length: 2 ft.– 4,000 ft. (1.64 m–1,220 m)Line Impedance: 120 Ohms–350 Ohms Distortion: 0.5% THD

Four Wire AudioTransmit Level: Adjustable -15dBV to + 4dBVImpedance: 600 Ohms, transformer isolated and

balanced Receive Level: Adjustable -15 dBV to + 4 dBVImpedance: 600 Ohms, transformer isolated and

balancedRange: Up to 5,000 ft. (152 m)

7

7 - 2 E F - 1 M I N T E R F A C E

DataBaud rate: 19.2 kilobits per second, selectable for

2400, 4800, or 9600 baudSettings: 8 data bits; 1 stop bit; no parity

Test Tone200 Hz Sawtooth Wave

Connectors (1) RJ-45(1) XLR female (1) DB-15 1/8 in. (3.17 mm) (1) phone jack on front panel

PowerDC Voltage: 24-32 VDC powered by intercom lineDC Current Requirement (with Data): 60 mADC Current Requirement (without Data): 40 mA

DimensionsHeight: 1.62 in. (41 mm) (1 RU, EIA rack)Width: 5.94 in. (151 mm)Depth: 4.80 in. (122 mm)Weight: 1.75 lbs. (.794 kgs)

Accessories Wiring diagram, adhesive backedTS-1 testing earphone

8 - 1

ITED WARRANTY

arranty does not cover any defect, malfunction, or Clear-Com, including unreasonable or negligent follow instructions in the manual, defective or tempts at modification and repair not authorized by roducts with their serial numbers removed or defaced

e express warranty given with respect to Clear-Com e user to determine before purchase that this product pose.

ding the implied warranty of merchantability, are limited warranty. Neither Clear-Com nor the dealer le for incidental or consequential damages of any


CLEAR-COM LIM

The Clear-Com Intercom Systems wfailure caused beyond the control of operation, abuse, accident, failure toimproperly associated equipment, atClear-Com, and shipping damage. Pare not covered by this warranty.

This warranty is the sole and exclusivproducts. It is the responsibility of this suitable for the user's intended pur

Any and all implied warranties, inclulimited to the duration of this expresswho sells Clear-Com products is liabkind.

Return authorization

numbers are

required for all

returns.

8


For your own records fill in the information below:

_____ Serial No.________________________________________________________________________________________________________ _______________________________________

________State _____ZIP ___________________

factory without first obtaining a return authorization

ust be accompanied by documentation stating the ate of purchase, and a description of the problem.

8 - 2

Model No.____________________Date Purchased ________________Purchased from (dealer)__________Address ______________________City ________________________

FACTORY SERVICEDo not return any equipment to the number.

All equipment returned for repair mreturn address, telephone number, d

Send equipment to be repaired to:

Customer Service DepartmentClear-Com Intercom Systems4065 Hollis Street Emeryville, CA 94608-3505Telephone: (510) 496-6666Fax: (510)496-6610Web site: www.clearcom.com

• Warranty and

non-warranty repairs

are available.

Contact the factory.

8 - 3

e for the repairs. Equipment being returned for and will be returned prepaid.

Rty must be sent prepaid to Clear-Com. If requested, ed prior to service. Once repair is approved and

e equipment will be shipped freight collect from the


WARRANTY REPAIRIf in warranty, no charge will be madwarranty repair must be sent prepaid

NON-WARRANTY REPAIEquipment that is not under warranan estimate of repair costs will be issurepair of equipment is completed, thfactory.

ef-1m interface - partyline · ef-1m interface 2-1 operation thank you for choosing this clear-com...

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