The Access Company

• Fiber-optic STM-1 line interface

• Full support of STM-1 standard services

• Provides conversion and gateway services between E1/T1 networks for both data and voice on a timeslot level

• Terminal multiplexer for grooming E1/FE1, T1/FT1, or n x 56/64 kbps data traffic

• Complies with ITU-T Rec. G.703, G.707, G.783, G.825, G.957 and G.958 standards

DXC-100 Module

DSTM-1STM-1 Multiplexer Module

Data Sheet

STM-1 multiplexer

for the DXC-100

family of modular

cross-connects

DSTM-1 is a single-port STM-1 module set, that provides SDH (Synchronous Digital Hierarchy) Path Terminating Equipment (PTE) functionality for DXC-100.

The module provides direct access to the STM-1 level (155.520 Mbps) services and can operate opposite any other DXC family member, or standard STM-1 equipment.

When operating as a fractional SDH Terminal Multiplexer (TM) for the DXC-100 unit, DSTM-1 multiplexes traffic from up to 63 E1 or 84 T1 data streams coming from any other port into a single STM-1 data stream. Mixed E1 and T1 multiplexing is also supported (see Table 1). The module routs any E1 or T1 data stream to any of the 63 TU-12 tributary units carried in the STM-1 VC-4 virtual container.

As a TM, DSTM-1 provides direct traffic grooming and multiplexing of E1/FE1, T1/FT1, or n x 56/64 kbps data.

DXC-100 with the DSTM-1 module can be also used as an E1/T1 converter.

Three link numbering schemes are available: AU-3 (VC-3/G.707), AU-4 (VC-3/G.707), and AU-4 (VC-3 sequential).

Mixing the E1 and T1 traffic in the same STM-1 frame can be done at the payload envelope level (STM-0) only when using the VC-3/G.707 link numbering scheme. The VC3-Sequential numbering scheme does not allow mixed T1/E1 modes.

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DSTM-1 STM-1 Multiplexer Module

Each payload is configured as E1 or T1, and framed by a 51.84 Mbps mapper. Each mapper conveys either E1 or T1 links. E1 and T1 traffic cannot be mixed within the same payload. The three 51.84 mappers are sequentially interleaved into a 155.52 SDH signal.

E1 links are mapped to VC-12 containers, while T1 links are mapped to VC-11 containers. These Virtual Containers (VCs) are then assembled into Transmission Groups (TUG) and then Administrative Units (AU) or payload envelopes before conversion to an optical signal.

The STM-1 port can be ordered with one of the following interface types:

• Short-haul 1310 nm optical interface, with an operation range of up to 15 km (9 mi)

• Long-haul 1310 nm optical interfaces, with operation range of up to 40 km (24 mi)

1:1 redundancy allows switching to another DSTM-1 module installed in an adjacent slot in case of critical link failure.

Setup, control, and diagnostics can be performed using an ASCII terminal connected to the supervisory port. Alternatively, these can be performed using Telnet or the RADview SNMP element management system connected to the Ethernet 10/100BaseT port.

Diagnostic capabilities include self-diagnostics at power-up, local and remote loopbacks, and performance monitoring of external and payload ports. For voice applications, call processing ABCD signaling bits can be monitored.

The DSTM-1 module can utilize direct X-Link connections to DXCC modules for stacked unit applications. When this feature is implemented, the STM-1 traffic can be directed to the DXCC without utilizing the nest midplane bus to allow higher physical capacity of that nest. When using X-Link support, a special software version must be ordered. Alternatively, DSTM-1 can also use the nest-resident TDM bus for multiplexing purposes, similar to other DXC-100 modules.

Figure 1. DXC-100 as a STM-1 Terminal Access Multiplexer

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Data Sheet

Specifications

STM-1 PORT

Physical Layer ITU-T Rec. G.957

Line Interface Dual optical fiber cable

Transmitter MQW Laser Mode diode

Bit Rate 155.520 Mbps

Timing Internal timing (locked to the system clock) Loopback timing (transmit timing locked to clock recovered from received STM-1 signal)

Typical Transmit Power Short haul: 11 dBm Long haul: -3 dBm

Operating Wavelength 1310 nm

Connectors Pair of SC connectors

Range Short haul: 0 to 15 km (9.3 mi) Long haul: 0 to 40 km (24.8 mi)

PAYLOAD PORTS

Number of Payload Ports See Table 1

Compliance E1: ITU-T Rec. G.732, G.823 and ITU-T Rec. G.704 T1: ITU-T Rec. G.704

Framing E1: CAS, CRC, CAS-CRC, or unframed T1: D4, ESF, or unframed

Nominal Data Rate E1: 2.048 Mbps T1: 1.544 Mbps

Timing Locked to the DXC-100 master clock DXC-100 master clock can be locked to one of the recovered internal E1 port clock signals

GENERAL

Indicators READY (red/green): indicates the status of the module set in general STATUS (red/green): indicates link status separately for the STM-1 line and the payload port TEST (yellow) indicates test status separately for the STM-1 line and the payload port Nest number indicator

Diagnostics User-activated STM-1 local and remote loopbacks User-activated local and remote loopbacks on each payload port User-activated local loopbacks on each VC-12 port

Performance Monitoring Line level based on ITU-T Rec G.829 E1 level based on ITU-T Rec G.826

Timeslot Allocation User-defined mapping, any timeslot to any timeslot

Routing of E1 Ports to TU-12s User-defined mapping, any E1 port to any TU-12

Power Consumption 12.5W (2.5A at +5 VDC)

Configuration Programmable via DXC-100 management by ASCII terminal, Telnet, or RADview Management System

Physical Front main module: Height: 26.3 cm (10.3 in) Width: 2.5 cm (0.98 in) Depth: 21.3 cm (8.38 in) Weight: 0.42 kg (0.93 lb)

Rear interface module: Height: 26.3 cm (10.3 in) Width: 2.5 cm (0.98 in) Depth: 12.7 cm (5.0 in) Weight: 0.26 kg (0.57 lb)

Figure 2. DXC-100 with DSTM-1 as an International Gateway

Table 1. Possible E1/T1 Combinations*

No. of T1 No. of E1

0 63

28 42

56 21

84 0

*VC-3/G.707 link numbering

scheme only

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DSTM-1

STM-1 Multiplexer Module

Data Sheet

International Headquarters 24 Raoul Wallenberg Street Tel Aviv 69719, Israel Tel. 972-3-6458181 Fax 972-3-6498250, 6474436 E-mail market@rad.com

North America Headquarters 900 Corporate Drive Mahwah, NJ 07430, USA Tel. 201-5291100 Toll free 1-800-4447234 Fax 201-5295777 E-mail market@radusa.com

www.rad.com

The Access Company

Ordering DXC-100M-STM-1-M 1-port STM-1 main module, 6U, front-mounted

DXC-100M-STM1OC3-IO/$ 1-port STM-1 or OC-3 rear-mounted interface with fiber optic interface, 6U, SC connectors

Legend

$ Interface range: 15 short-haul, up to 15 km/9.3 mi 40 long-haul, up to 40 km/24.8 mi

12 avenue des prés78059 St Quentin en Yvelines

Tel: 33 (0)1 77 55 03 00Fax: 33 (0)1 30 44 11 95

http://www.cbnetworks.fr E-mail: sales@cbnetworks.fr

http://www.CBNETWORKS.fr - E-Mail: sales@cbnetworks.fr - Tel: 33 (0)1 77 55 03 00