DXC-8R, DXC-10A, DXC-30

Digital Cross Connect

• Modular construction with four, five or 15 I/O slots allows maximum flexibility between ports
• Services supported: n x 56/64 kbps, ISDN, IDSL, SHDSL, E1, T1, E3, T3, T3/747 and STM-1 over copper, fibre or xDSL media
• Inverse multiplexing up to 15.7 Mbps
• Optional system redundancy
• Optional link and/or hardware protection
• Built-in E1/T1 converter including A-law/μ-law and signaling conversion for PCM timeslots
• Diagnostic capabilities include local and remote loopbacks and BER test
• Inverse multiplexing up to 15.7 Mbps
• Broadcast capabilities (single point to multipoint)
• Auxiliary control from an ASCII terminal
• SNMP agent for in-band and out-of-band network management using RADview software

Product Summary

RAD's DXC8R/10A/30 digital cross connect nodes are a family of products that provide non-blocking cross connect for up to 240 lines. The modular digital cross connect units support E1/T1 conversion, inverse multiplexing, signaling monitoring, grooming of fractional traffic, and transmission of T1 circuits over E1 lines. Services supported include n x 56/64 kbps, ISDN, E1/T1, E3/T3, xDSL, and STM-1 over copper, fibre or xDSL media. The larger DXC devices function as a central site hub for many RAD access products. Typical applications range from high speed access to SDH/SONET/PDH backbones and distributing services from network trunks over E1/T1 or STM-1 daisy chains, to cross-connecting trunks at the POP and broadcasting identical data to multiple locations. To ensure maximum system reliability, the DXC8R/10A/30 digital cross connect nodes can be equipped with full or partial redundancy and protection solutions.

Benefits

• Leased line services can be delivered at lower capital and operational costs • Small footprint allows easy installation in street cabinets and cell tower sites • Bundled services can be delivered over copper or fibre optic lines with integrated fibre optic, SHDSL and IDSL modems • Central management solutions simply system organization, administration and management

Further Product Information

The DXC digital cross connect family consists of modular multiservice access nodes providing non-blocking DS0 cross connect for up to 240 lines. Plug-in interface modules can accommodate up to eight links each. Many services are supported, including n x 56/64 kbps, ISDN, E1, T1, E3, T3, STM-1 and inverse multiplexing.

Cross connect, groomer and broadcast

All DXC modules allow maximum flexibility between ports. A user-programmable connection matrix connects any incoming 56/64 kbps timeslot to any outgoing 56/64 kbps timeslot. It supports cross connect functions such as drop-and-insert, distribute and collect. The DXC digital cross connect family enables grooming fractional traffic from the user side into full E1/T1, E3/T3 or STM-1 trunks, for connection to the network. Grooming and bandwidth maximization are implemented by placing the n x 56/64 kbps data channels into an E1 or T1 frame (including internal E1/T1 of the E3 or T3 modules or VC-12 containers of the STM-1 module), using only the required number of timeslots. This provides fractional CSU/DSU functionality. The DXC digital cross connect family can broadcast any traffic combination from a single input to numerous destinations. Channel relocating and half duplex conferencing are also supported.

E1/T1 converter

The DXC family is also capable of converting between E1/T1 ports. A-law/µ-law and signaling conversion are performed according to E1 and T1 standards. DXC-8R and DXC-10A convert up to 16 ports; DXC-30 and DXC-30E up to 16 ports. T1 traffic can be directly extracted from the STM-1 module (which can act as a converter for up to 30 T1 links).

E3, T3 and STM-1 multiplexer modules

These modules provide full channelization functionality for the multiplexing and demultiplexing of DS0 traffic. Aggregated payload is 34 Mbps for E3; 45 Mbps for T3; and the equivalent of 61 Mbps for STM-1 (one chassis). When chaining a number of units, the aggregated payload is equivalent to 155 Mbps.

Redundancy

The DXC digital cross connect family provides flexible redundancy and protection to accommodate each user's needs and help minimize service downtime. The modules' link protection is user-programmable. Hardware protection and partial or full redundancy can be added at any time. Redundancy in each unit: • DXC-30 and DXC-30E system redundancy (power supply and common logic) is optional and can be added at any time. Partial redundancy can also be provided. • DXC-8R has built-in full system redundancy • DXC-10A has no system redundancy option • Most DXC modules support line redundancy

Basic units

The compact half-19" 1U-high unit grooms timeslots from four or eight E1/T1 links to a single E1/T1 uplink. Optional power supply redundancy.

DXC-4

The compact 1U-high unit can support up to 32 ports. It is fully redundant and includes two power supplies, two common logic modules and four I/O slots for the plug-in interface modules.

DXC-8R

The compact 1U-high unit can support up to 40 ports. It is not redundant and includes one power supply, one common logic module and five I/O slots for the plug-in interface modules.

DXC-10A

The space-saving 3U-high unit can support up to 120 ports. The basic unit includes one power supply, one common logic module and 15 I/O slots for the plug-in interface modules. Optional secondary power supply and/or common logic can be ordered at any time for full or partial system redundancy.

DXC-30

The enhanced 6U-high xDSL multiservice unit can support up to 240 ports, one common logic module and 15 I/O slots for the plug-in interface modules. Optional secondary power supply and/or common logic can be ordered at any time for full or partial system redundancy.

DXC-30E

The stackable unit can support up to 688 ports and 1.2 Gbps 3/1/0 cross connect capabilities Various timing options cover all timing possibilities for the E1/T1 interface. These include internal clock, external clock and loopback timing sourcing from any selected E1/T1, n x 56/64 kbps, E3/T3 or STM-1 port.

DXC-100

Setup, control and diagnostics can be performed via an ASCII terminal or Ethernet port. A built-in SNMP agent enables three management options: • Independent management • Management by the RADview-EMS/TDM network management system running on an HP OpenView or Windows platform • Management by the RADview Service Center path management system Configuration and diagnostics of remote services are provided through either TS0 or a dedicated timeslot, which can be groomed by the DXC alongside the payload traffic (for up to 30 management links supporting PPP). Out-of-band management is available via PPP or SLIP. Diagnostic loopback support for most modules includes loopback toward the local or remote DTE. Data monitoring capabilities are supported by configuring any high speed port to monitor any given port in the enclosure. The DXC can be controlled remotely via dial-up modem.

Setup, management and diagnostic tools

Most modules listed on the next page are supported by all DXC chassis. A variety of port densities are available, from single-port to 8- port modules. Most modules support hardware and/or line redundancy and ensure a protective switching time of under 50 msec. Additional features include integrated modems (fibre, IDSL, HDSL and SHDSL), range extenders and powerful, integrated testing capabilities that minimize network downtime. The DXC features built-in BER testing, programmable on any port on a timeslot level, and loopback capabilities.

Modules

DFSTM-1 1-port or 2 -port standard 155 Mbps STM-1 interface provides direct access to the STM-n SD H ADM at the STM-n level. The STM-1 terminal multiplexer (TM) module grooms up to 61.44 Mbps of traffic to a standard STM-1 frame over fibre or copper. The 2 -port module can be used in a drop-and-insert daisy-chain to expand services or for redundancy. When daisy-chaining units, full payload is supported.

STM-1 terminal module

DE3 1-port E3 interface module provides access to a standard E3 frame over an unbalanced coax or fibre links. A user-programmable connection table enables fractional data traffic from various sources to be groomed into full internal E1 trunks. DT3 1-port T3 interface module provides access to a standard T3 frame over an unbalanced T3 or fibre link. A user-programmable connection table enables fractional data traffic from various sources to be groomed into full internal T1 trunks. T3/747 (see special modules).

E3/T3 modules

D4E1/D8E1 4-port or 8-port interface modules transmit to a range of up to 2.2 km (1.4 miles) by using the built-in LTU. They have a data rate of up to 2.048 Mbps per port, and support BERT and loopback per time slot. Resistive attenuation adjustment (10 dB - 30 dB) supports signaling monitoring applications (such as SS7 network maintenance and billing). DE1B 2 -port E1 interface mo dule transmits to a range of up to 2.2 km (1.4 miles) with an LTU option. BERT and loopback per timeslot are optional. Automatic traffic bypassing is optional.

E1 modules

D4T1/D8T1 4-port or 8-port interface modules transmit to a range of up to 2.2 km (1.4 miles) by using the built-in CSU. The data rate is up to 1.544 Mbps per port. The module supports BERT and loopback per timeslot. Attenuation adjustment (10 dB - 30 dB) supports signaling monitoring applications (such as SS7 network maintenance and billing). DT1B 2-port T1 interface module transmits to a range of up to 2.2 km (1.4 miles) with a CSU option. BERT, loopback per timeslot and automatic traffic bypassing are optional.

T1 modules

D8SL 8-port interface module uses standard SHDSL technology to extend the range of E1 connections over 2-wire cable up to 10.7 km (6.6 miles). D4SL 4-port interface module uses standard SHDSL technology to extend the range of E1 connections over 2-wire cable up to 10.7 km (6.6 miles). D8U 8-port module enables IDSL extension to remote modems at ranges of up to 5.5 km (3.4 miles) or as ISDN (U interface) 2B+D channel transmission at ranges of up to 5.5 km (3.4 miles). Data rate is up to 128 kbps per port. D16U high density 16-port module enables IDSL extension to remote modems at ranges up to 5.5 km (3.4 miles) or ISDN (U interface) 2B+D channel transmission at ranges up to 5.5 km (3.4 miles), at data rates up to 128 kbps per port.

xDSL modules

D8HS 8-port n x 56/64 kbps data module provides eight high speed synchronous data channels, independently selected for V.35, RS-422/V.11, X.21 or RS-530 interface. DHS 2-port n x 56/64 kbps data module provides two high speed synchronous data channels. Each channel is independently selected for 10/100BaseT Ethernet bridge including VLAN support, 10BaseT Ethernet router, V.35, RS-422/V.11, X.21 or RS-530 interface. DIM is a digital inverse multiplexer module for up to eight E1/T1 channels (15.7 Mbps of traffic). The module has an integrated 10/100BaseT Ethernet bridge, including VLAN support, 10BaseT Ethernet router, V.35, RS-530, HSSI, X.21 or E1 interface. Traffic can be groomed directly to any of the E1, E3, T1, T3, T3/747 or STM-1 modules. The module is interoperable with any of the IMX products. DT3/747 1-port T3 interface module provides access to standard T3 according to G.747 from 21 independent E1 or T1 channels, over a copper or fibre interface.

Special modules

The DXC family acts as the central solution for many RAD or other standards-based products. The DXC-8R and DXC-10A 1U chassis are geared for installations that require a compact unit (e.g., cellular base stations) or lower capacity of up to 40 ports (e.g., a carrier's initial stage of deployment). Typical applications: • E1/T1 access platform over SHDSL, IDSL, fibre or copper, featuring data/voice concentration and integrated management • Providing conversion/gateway between T1 and E1 networks, for both data and voice • Providing high speed access (e.g., Ethernet, HSSI) to a carrier's high speed digital backbone over n x E1/T1, E3/T3 or STM-1, where n represents one to eight lines • Distributing services from an SDH or other network to a wide variety of end users by creating an E1/T1 or STM-1 daisy-chain • Grooming fractional trunks to full trunks • Maximizing data traffic payload over E3, T3 or STM-1 trunks • Grooming of monitoring signals (SS7 or other) for advanced services and Quality of Service • Broadcasting identical data to multiple destinations • Cross-connecting trunks at the point-of-presence (POP) • Grooming a variety of services at the POP over n x E1/T1, E3/T3 or STM-1 • Cost-effective, user-friendly, protective E1/T1 ring for wireless users

Applications

DXC users and markets include the following: • Cellular operators • Wireless operators • Incumbent and alternative carriers • International carriers • Utility companies • Enterprises • Multi-tenant units (MTUs) • Transportation • Ship-to-shore communications • Test and maintenance operators (SS7 networks) • Internet service providers (ISPs)

Target markets

Daisy-chain application

Native LAN over n x E1/T1 lines

Line protection by different media types

Low cost E1/T1 over radio ring