DXC STM-1 Multiplexer Specifications

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DXC STM-1

RAD DXC STM-1
Specifications

SDH transmission solution for access networks, expanding local loops to 60 km / 37 miles
Digital cross-connection for up to 960 timeslots on copper, fiber or HDSL links
Programmable DS0 non-blocking cross-connection
E1/T1 conversion supports A-law/ľ-law and signaling conversion
Transmission of T1 traffic over E1. Complies with ITU-T G.802
Broadcast support
Flexible configuration as an STM-1 terminal or an ADM (add&drop multiplexer) with full cross-connectivity and PDH interfaces
Supports centralized management, including configuration, service, performance, security and fault management
Integrated management system supporting RAD's Multiservice Access Platform (MAP) equipment
Telnet support
Separate dial-in/dial-out port
Accurate timing transfer to access equipment
Optional redundancy for common logic and power supply
1:1 tributary protection switching
Traffic grooming into E3/DS3 uplinks
Inverse multiplexing module supports up to 8 E1/T1 trunks
RADview management system on PC or UNIX (HP OpenView) platform
Local Loop Access solution with LTU or CSU options for extended range, built-in fiber optic, or HDSL modems
TFTP support for common logic software upgrade
Test and monitoring at any port

DXC-STM-1 is available with standard G.703 or optical short/long haul aggregates.

SDH transmission supports a full range of access systems, including Remote Subscriber Units (RSUs), Digital Line Carriers (DLCs), Passive Optical Networks (PONs), Digital Cross-Connect (DACS) and service multiplexers.

DXC-STM-1 is fully compatible with 34 Mbps and 45 Mbps PDH signals, SDH microwave radio relays and existing SDH infrastructure.

DXC-STM-1 supports the whole range of SDH network topologies:

Point-to-Point
Chain
STM-1 ring / folded ring
STM-4/16 ring / STM-1 structured ring-star and ring-ring.

DXC-STM-1 facilitates centralized management of the access network. Centralized management combines the powerful RADview network management application in the SDH transmission layer with the access equipment manager of a specific application. The access equipment manager uses embedded management channels for communication with remote access equipment. Centralized management enables the building of flexible, responsive and optimized SDH access networks to fit any customer's needs.

The 2 Mbps output signals of DXC-STM-1 can be resynchronized by the multiplexer clock. In addition, pointer justification events can be filtered out, eliminating phase hits. This creates an accurate signal, clear of phase hits and suitable for synchronization of access equipment. Since the SDH network is usually synchronized by the national synchronization network, this accurate timing is transferred to the access equipment.

EXPANSION MODULES -
ADM SECTION

The interface capacity of the DXC-STM-1 can be expanded from its basic 21 x 2 Mbps configuration of the ADM section by adding the following expansion modules (ordering options):

R-STM-1E/EXT42 expands the ADM capacity from 21x2 Mbps (21 E1) to 63x2 Mbps (63 E1) tributary interfaces.

R-STM-1E/EXT34 provides three E3 (3x34 Mbps) tributary interfaces.

R-STM-1E/EXT45 provides three T3 (3x45 Mbps) tributary interfaces.

I/O MODULES -
CROSS-CONNECT SECTION

DXC-STM-1 supports the following plug-in interface modules supporting n x 56/64 kbps, T1, E1, T3 or E3 transmission over copper, fiber or HDSL.

DT1/DT1B, the two-port T1 interface modules, support both D4 or ESF framing formats and AMI line code (zero suppression is selectable for either Transparent, B7ZS or B8ZS). For long range applications, a CSU option is available. The DT1B version provides BERT, loopback per timeslot, and 1:1 redundancy. DT1/DT1B is available with both copper and fiber-optic interfaces.

DE1/DE1B, the two-port E1 interface modules, support both 2 and 16 frames per multiframe (256N and 256S, respectively), TSO multiframe with CRC-4 and HDB3 line code. For long range applications, a CSU option is available. The DE1B version provides BERT, loopback per timeslot, and 1:1 redundancy. DE1/DE1B is available with both copper and fiber-optic interfaces.

DT3, the single-port T3 interface module, supports multiplexing of up to 28 T1 channels into a T3 frame with C-bit parity per ANSI T1.404 or M13 framing options. DT3 is available with both copper and fiber-optic interfaces.

DE3, the single-port E3 interface module, supports multiplexing of up to 16 E1 channels into an E3 frame per ITU-T G.751. DE3 is available with both copper and fiber-optic interfaces.

DHS, the two-port n x 56/64 kbps data module, provides two high speed synchronous data channels. Each channel is independently selected for either V.35 or V.11/RS-422 interface. Each channel can support bit rates of n x 56 kbps or n x 64 kbps, where:

DIM, the digital inverse multiplexer module, working in conjunction with DE1, DE1B, DT1, DT1B, D4E1/D8E1, D4T1/D8T1, DHL/E1, DHL/E1/2W, DHL/T1, DE3 or DT3 interface modules, enables DXC to function as an inverse multiplexer. DIM allows transmission of high speed signals over up to eight E1/T1 lines. This is achieved by breaking down the high speed signals over the multiple E1/T1 lines and routing these signals over different paths or facilities, while ensuring transmission integrity.

DHL/E1, the two-port HDSL module, uses HDSL technology to extend the range of the DXC up to 4.0 km (2.5 miles) over 24 AWG (0.5 mm), 4-wire copper cable. It works opposite other RAD products with HDSL technology (such as HCD-E1, HTU-E1, HTU-E1L, HTU-2 and Megaplex-2100/2200 with HDSL modules). DHL/E1 complies with ITU-T G.704 and ETSI ETR-152 standards.

DHL/E1/2W, the two-port HDSL module, uses HDSL technology to extend the range of the DXC up to 3.0 km (1.9 miles) over 24 AWG (0.5 mm), 2-wire copper cable. It works in conjunction with the HCD-E1/2W, extending the range of the traditional subscriber loop while saving on the copper infrastructure. DHL/E1/2W complies with ITU-T G.704 and ETSI ETR-152 standards.

DHL/T1, the two-port HDSL module, uses HDSL technology to extend the range of the DXC up to 4.8 km (3.0 miles) over 24 AWG (0.5 mm), 4-wire copper cable. It works opposite other RAD products with HDSL technology (such as HTU-T1, HTU-T1L and Megaplex-2100/2200 with HDSL modules). DHL/T1 complies with ITU-T G.704 and ANSI T1E1.4.

D4E1/D8E1, the four or eight-port E1 interface modules provide 4 or 8 E1 links over copper cable supporting E1 or fractional E1 rates.

D4T1/D8T1, the four- or eight-port T1 interface modules provide 4 or 8 T1 links over copper cable supporting T1 or fractional T1 rates.

D8U, the 8-port ISDN "U" interface module, provides independent ISDN "U" ports, each supporting 2B + D channels, for total payload data rate up to 128 kbps per port.

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