k08 qmh and other line units
DESCRIPTION
TLLABSTRANSCRIPT
Tellabs 8100QMH and Other Line Units
Tellabs 8100QMH and Other Line Units
ObjectivesObjectives
> You will know
> Tellabs 8100 QMH unit
> Tellabs 8100 XCG unit
> Tellabs 8100 GMH unit
Line Unit ApplicationsLine Unit Applications
User equipment
User equipment
User equipment
User equipment
NTU connection
Trunk
QMH UnitQMH Unit
> Four G.704 trunk / user equipment interfaces with 2048 kbit/s
> Split trunk usage possible with all four interfaces
> 1+1 protection available for interfaces 1 and 2 only
QMH
G703-75Q
QMH UnitQMH Unit
> Available interface types
Module Interface Type
G703-75-Q G.703 75-ohm Trunk/User
G703-120-Q G.703 120-ohm Trunk/User
BTQ-2304 T-SDSL Modem
HCQ HDSL Modem
> Supported by Tellabs 8140, 8150, 8160 and 8170 nodes
XCG UnitXCG Unit
> SCU + SXU-A + 1*QMH
> Typical use:
> Replaces SXU and SCU in a smallcapacity access node
> 2048 kbit/s trunk and user interfaces
> 1+1 protected or split trunk interfaces
> Available interface types
Module Interface Type
G703-75-4CH G.703 75-ohm Trunk/User
G703-120-4CH G.703 120-ohm Trunk/User
XCG
SC
IF1
IF2
SYNC
IF3
IF4
XCG
SC
IF1
IF2
SYNC
IF3
IF4
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
XCG: LimitationsXCG: Limitations
> XCG cannot be protected.
> XCG cannot be used in a double subrack.
> XCG has memory of 64 kBytes, it does not support certain units in the same node.
> Generally recommended for use in a midi subrack only
GMH UnitGMH Unit
LEDS
75 OHM out75 OHM in
SYMM, IN/OUT
MEAS point
OPT, out
OPT, in
Interface modules
Typical use:> Trunk interface> User interface> NTU interface
Two modules> May be different> One interface per module
GMH Interface ModulesGMH Interface Modules
> Available interface types:
Product Interface Type
G703-8M G.703 75-ohm Trunk/User
G703-75 G.703 75-ohm Trunk/User
G703-120 G.703 120-ohm Trunk/User
HCE-2M-2P HDSL Modem
LTE Line terminal Baseband
OTE-LED Optical line Optical
OTE-LP Optical line Optical
V35-G704-BS V.35 Trunk
X21-G704-S X.21 Trunk
> Interface modules are supported by Tellabs 8140, 8150, 8160 and 8170 nodes
Framed ModeFramed Mode
> Receiver synchronizes to the incoming signal frame structure.
> Possibility to monitor the signal
TS0
TS16
check & regenerate
Data to X-bus
User equipment
User equipment
End-to-end connection
Unframed ModeUnframed Mode
> Not synchronized to the incoming signal
> The contents of the signal not changed
TS0
TS16
Data to X-bus
User equipment
User equipment
End-to-end connection
Interface ParametersInterface Parameters
> Bit rate> Cannot be changed after locking the interface
> Different options for different module types
> Faults masked no alarms generated about the interface
> Control type
> Rx buffer length> 2 fr: trunk interfaces
> 4 fr: trunk & user IFs
> 8 fr: split trunks
> 64 fr: special purposes
Overhead Bits in a Framed InterfaceOverhead Bits in a Framed Interface
> Use of bits in time slot 0
> Time slot and bits for HDLC
X-conn:
bits transmitted transparently
Master clock RAI:
far-end clock alarm bit
HDLC link timeout:
time to wait for response
Pilot bits:
for carrying transmission alarm notification
BuffersBuffers
Transmit:
> Length set to two frames
> Synchronizing the transmitted frame and X-bus
Receiving:
> Length 2, 4, 8 or 64 frames
> Storing incoming data
> Compensating minor speed differences
RX
TX
ReceiveFrame buffer
TransmitFrame buffer
Inte
rfac
e
Unit LoopsUnit Loops
> Finding
> Faulty section of the line
> Faulty Tx/Rx direction
> Timeout controlled
> Loop can be created in different points in the unit
Unit LoopsUnit Loops
XB
US
Interface Loop
Frame demux
Frame mux
Base unitInterface
Interface
XB
US
Frame demux
Frame mux
Base unitInterface
Interface
XB
US
Frame demux
Frame mux
Base unitInterface
Interface
Equipment loop
Line loop
Unit TestsUnit Tests
> LED operation test
> Memory test
Answer the questions in your material!
SummarySummary