RAD DXC-30E Enhanced xDSL Multiservice Access Node
DXC Family of Digital Cross Connect Units

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RAD DXC-30E Enhanced xDSL Multiservice Access Node
DXC-30E-1/U/R/AC   DXC-30E-1/UTP/AC   DXC-30E-3/UTP/R/AC

  • Digital cross-connection for up to 960 timeslots on copper, fiber or HDSL links

  • Supports Fractional STM-1, E3, T3, E1, T1, n x 56/64, and ISDN services over copper (2/4-wire) and fiber media

  • The modular DXC family includes the following chassis types:

    • DXC-8R with 4 I/O modules

    • DXC-10A with 5 I/O modules

    • DXC-30 with 15 I/O modules

    • DXC-30E with 15 6U-high I/O modules

  • Optional redundancy in common logic and power supply

  • 1:1 protective switching

  • E1/T1 conversion supports A-law/?-law and signaling conversion

  • Transmission of T1 traffic over E1, complying with ITU-T G.802

  • Traffic grooming into E3/T3 uplinks

  • Broadcast support

  • Inverse multiplexing module supports up to 8 E1/T1 trunks

  • Controlled slip buffer for overflow/underflow

  • TFTP support for common logic software upgrade

  • Test and monitoring at any port

  • Management:

    • Out-of-band via V.24 supervisory port or Ethernet management port

    • Inband via TS 0 or dedicated timeslot

  • RADview SNMP management system on UNIX (HPOV) platform

  • Telnet support

  • Separate dial-in/dial-out port

  • Supports SNMP agent and standard management protocols: SLIP, PPP and RIP2

  • Local loop access solution with LTU or CSU options for extended range, built-in fiber optic, or 2-wire/4-wire HDSL modems


  • The DXC family of modular Multiservice Access Nodes provides non-blocking cross connection of up to 960 timeslots for up to 120 fractional E1/T1 ports. Plug-in interface modules provide n x 56/64 kbps, E1, T1, E3, T3 or Fractional STM-1 transmission over copper, fiber or HDSL. Also available is the DIM module which provides inverse multiplexing capabilities of up to 8 x E1 or 8 x T1.

  • Typical applications for the DXC:

    • Providing local loop access solution, together with traffic grooming for re-directing voice and data to different trunks (see Figure 1)

    • Concentrating multiple fractional E1/T1 lines from a cellular base station (BTS) onto a full E1/T1 link to the mobile switch center (MSC) (see Figure 2)

    • Providing conversion/gateway between E1 and T1 networks for both data and voice (see Figure 3).


    • Providing inverse multiplexing of a single higher rate logical channel over up to 8 E1/T1 links (see Figure 4).

  • In order to support the needs of different applications, the DXC family features four chassis variants:

    • DXC-8R (1U-high) chassis with 4 I/O module slots.

    • DXC-10A (1U-high) chassis with 5 I/O module slots

    • DXC-30 (3U-high) chassis with 15 I/O module slots

    • DXC-30E (6U-high) chassis with 15 6U-high I/O module slots

    All units can be mounted in 19" racks.



  • DXC-30/30E supports up to 120 E1/Fractional E1, T1/Fractional T1, or up to 30 n x 56/64 kbps ports. DXC-10A supports up to 40 ports, while the smaller DXC-8R supports up to 32 ports. A user-defined connection table programs connection of any incoming 64 kbps timeslot to any outgoing 64 kbps timeslot. Support is provided for drop & insert and broadcast applications.

  • Cross-connection of n x 56 kbps or n x 64 kbps channels is implemented by placing the data onto an E1 or T1 frame, using only the required number of timeslots. This provides Fractional CSU/DSU functionality.

  • DXC modules support three types of redundancy:

    • Line (single-slot) redundancy (1:1) ensures protective switching within less than 50 msec, between ports on the same module.

    • Hardware (Y-cable) redundancy between modules protects the service from hardware failure. This type of redundancy is supported by the copper interface only.

    • Line and hardware (dual-slot) redundancy are ensured by installing two DE3/DT3 modules in a chassis (only one is active).


  • DXC can function as a converter between E1 ports and T1 ports:

    • DXC-8R converts between up to 12 E1 and 16 T1 ports.

    • DXC-10A converts between up to 16 E1 and 16 T1 ports

    • DXC-30/30E converts between up to 16 E1 and 16 T1 ports

  • A-law/?-law and signaling conversion is performed according to the E1 and T1 standards.


  • The basic DXC-30 and DXC-30E units include one power supply, one common logic module and fifteen I/O slots for the plug-in interface modules. Optional redundancy for the common logic and power supply is available.

  • The basic DXC-10A unit includes one power supply, one common logic module and five I/O slots for the additional plug-in interface modules.

  • The basic DXC-8R unit includes two power supplies and two common logic modules for system redundancy. DXC-8R has four I/O slots for the plug-in interface modules.

  • Timing options cover for the E1/T1 interface include internal clock, external station (master) clock, and loopback timing from any selected E1/T1 or n x 56/64 kbps port.


  • The DCL.2/DCL.3 common logic module stores the matrix configuration and event information, as well as configuration for alarm masking. It communicates with the management station using a SLIP/PPP/Ethernet connection (by means of an SNMP agent). DCL.2/DCL.3 can pass management information received from 30 remote sites over a single dedicated timeslot or TS 0, to the central management site. Flash for software download, Telnet and ASCII terminal management are also supported.

I/O MODULES (see enclosed data sheets for detailed specifications)

  • DT1B and DT1, the two-port T1 interface modules, support both D4 or ESF framing formats. For long range applications, a CSU option is available. DT1B additionally provides BERT, loopback per timeslot, and 1:1 redundancy. DT1B is available with either copper or fiber optic interface.

  • DE1B and DE1, the two-port E1 interface modules, support both 2 and 16 frames per multiframe formats, TS 0 multiframe with CRC-4 and HDB3 line code. For long range applications, an LTU option is available. DE1B additionally provides BERT, loopback per timeslot, and 1:1 redundancy. DE1B is available with either copper or fiber optic interface.

  • DT3, the single-port T3 interface module, supports multiplexing of up to 28 T1 channels into a T3 frame with either C-bit parity or M13. DT3 is available with either copper or fiber optic interface.

  • DT3/747, the single-port T3 interface module (DCL.2 only) supports submultiplexing of 21 E1s into a single DS3 data stream. Mixed (E1 and T1) traffic applications are also available. The DT3/747 module is available with either copper or fiber optic interface.

  • DE3, the single-port E3 interface module, supports multiplexing of up to 16 E1 channels into an E3 frame. DE3 is available with either copper or fiber optic interface.

  • DHS, the two-port n x 56/64 kbps data module, provides two high speed synchronous data channels. Each channel can be independently ordered as V.35, V.11/RS-422 or X.21 interface. ETH10/100 and IP router versions are also available. Synchronous channels support data rates of n x 56 kbps, or n x 64 kbps, where n is 1 to 24 for T1 and 1 to 31 for E1.

  • DIM, the Digital Inverse Multiplexer module, working in conjunction with DE1, DE1B, DT1, DT1B, DE3, DT3, D8E1, D8T1 or DFSTM-1 interface modules, enables transmission of high speed signals over up to eight E1/T1 lines. This is achieved by breaking down the high speed (RS-530, V.35, X.21, HSSI, E1 and ETH) 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 DXC up to 4.0 km (2.5 miles) over 24 AWG (0.5 mm), 4-wire copper cables. It works opposite other RAD products with HDSL technology.

  • DHL/E1/2W, the two-port HDSL module, uses HDSL technology to extend the range of DXC up to 3.0 km (1.9 miles) over 24 AWG (0.5 mm), 2-wire copper cables. It can work in conjunction with HCD-E1/2W, to extend the range of the traditional subscriber loop while saving on the copper infrastructure.

  • DHL/T1, the two-port HDSL module, uses HDSL technology to extend the range of DXC up to 4.0 km (2.5 miles) over 24 AWG (0.5 mm), 4-wire copper cables. It works opposite other RAD products with HDSL technology.

  • D4E1 and D8E1, the 4- or 8-port E1 interface modules, provide 4 or 8 E1 links over copper cables, supporting E1 or Fractional E1 rates.

  • D4T1 and D8T1, the 4- or 8-port T1 interface modules, provide 4 or 8 T1 links over copper cables, supporting T1 or Fractional T1 rates.

  • D8U and D16U, the 8 or 16-port ISDN "U" interface modules, provide independent ISDN "U" ports, each supporting 2B + D channels, for total payload data rate up to 128 kbps per port. D8U/D16U can be configured either to extend ISDN lines over non-ISDN facilities (/I mode), or as dedicated LTU (line termination unit) for the ASM-31 or ASMi-31 short-range modems.

  • DFSTM-1, the fractional STM-1 module, provides direct access to the Synchronous Digital Hierarchy (SDH) transmission cores, at the STM-1 level (155.520 Mbps).


  • Setup, control and diagnostics can be performed out-of-band via a V.24 supervisory port or optional Ethernet management port, using an ASCII terminal with SLIP or PPP protocols. A built-in SNMP agent enables remote management for configuration and diagnostics of remote devices (up to 30 remote locations) using TS 0, a dedicated timeslot on the E1/T1 trunk, or Telnet.

  • DXC provides diagnostic loopback support for each E1/T1 or n x 56/64 kbps module. DE1B/DT1B modules support loopbacks per timeslot including an internal BERT and loopbacks toward the local or remote DTE. DT1B modules also support PLB or LLB code injection per ANSI T1.403.

    Any port can be configured to test and monitor data on any given port of the enclosure.

  • Enhanced statistics include T1 ESF diagnostics according to ANSI T1.403 and AT&T 54016 (Local Support); E1 CRC-4 diagnostics per ITU-T Rec. G.706 are performed in a manner similar to AT&T Pub. 54016.

  • A separate dial-in/dial-out port supports remote configuration (dial-in) and automatic alarm indication (dial-out). For dial-out operation, an external modem is activated to automatically dial a pre-programmed number whenever an alarm event occurs.

  • Multiple DXC hubs can be managed by either a UNIX-based (RADview-HPOV/TDM) or PC-based (RADview-PC/TDM) user-friendly SNMP management system. In addition, configuration and monitoring is provided via Telnet or a dumb terminal.

  • Network management provides centralized control of all network nodes, including interface configuration, connection setup, alarm and management. Alarm status and system configurations are available at all times.

  • Programming and setup of a remote DXC is done either:

    • Via TS 0

    • Through the supervisory port of the remote unit, over a modem link, or over a FRAD

    • Over a full inband dedicated timeslot, supporting FR, PPP and RIP2 standard protocols.




DXC-30E Enhanced xDSL Multiservice Access Node 

Timeslots Mapping

Any timeslot to any timeslot, with/without A-law/?-law and/or signaling conversion per timeslot

Unused Timeslot Code

Any user defined code


System clock source:

Internal clock ( ?32 ppm)
External clock (G.703, RS-422)
Receive clock (from any port)

Station Clock Interface

Data rate:

1.544/2.048 Mbps (selectable)
Compliance: ITU-T Rec. G.703 or V.11/RS-422


RJ-45, balanced;
BNC coaxial, unbalanced

Elastic Buffer

Buffer length: ?1 E1/T1 frame
Underflow: 1 frame repeated
Overflow: 1 frame skipped (No frame sync loss for buffer overflow or underflow)

Data delay: up to 375 ?sec

Signaling buffer: ?1 E1/T1 multiframe


Local E1 or T1 loopback
Remote E1 or T1 loopback
Local and remote n x 56/64 kbps data port loopback
Code activated network loopbacks per ANSI T1.403 (DT1B)
Loopback for any timeslot (DE1B/DT1B) per ANSI 403 RDL
Built-in BERT (DE1B/DT1B)
Alarm mask (user-defined)


T1 ESF diagnostics:

Full support according to ANSI T1.403 and local support according to AT&T 54016

Transparent FDL between two T1 ports

E1 CRC-4 diagnostics:

Per ITU-T Rec. G.706; RFC 1406, 1407

Local support equivalent to AT&T 54016

Management Port

Dial Port (SP-MODEM) with V.24/RS-232, async interface;
Data rate: 0.3?57.6 kbps, autobaud

Connector: D-9 female, DTE

Ethernet with 10BaseT (DCL.2 only)
Ethernet with 10/100BaseT (DCL.3 only)
Ethernet with 10Base2 (DCL.2 only)


Front panel:

Major Alarm, Minor Alarm, Test,

On-line (per power supply) On-line (per common logic)

Rear panel:

Module indicators (see separate data sheets)



Height: 26.6 cm / 10.5 in (6U)
Width: 43.8 cm / 17 in
Depth: 25.4 cm / 10 in
Weight: Less than 16 kg / 35 lb


Height: 13.2 cm / 5.25 in (3U)
Width: 43.8 cm / 17 in
Depth: 25.4 cm / 10 in
Weight: Less than 8 kg / 17 lb

DXC-10A and DXC-8R

Height: 4.4 cm / 1.75 in (1U)
Width: 44.0 cm / 17.3 in
Depth: 25.4 cm / 10 in
Weight: Less than 2.5 kg / 5.5 lb

(All weights are given for fully equipped hubs)

Power Supply

100-240 VAC, 47 to 63 Hz
+24V, -48 VDC nominal

Power Consumption (max)

DXC-8R: 60W
DXC-10A: 60W
DXC-30: 120W
DXC-30E: 188W


Temperature: 0?4 5 C / 32?11 3 F
Humidity: up to 90%, non-condensing




DXC-Family Application


      Figure 1. Multiservice Access Platform

      Figure 2. Bandwidth Optimization in a GSM Network using DXC-8R

      Figure 3. E1/T1 Conversion and Access to Carrier Backbone

      Figure 4. Inverse Multiplexing Application





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