T1 DXC / T1 DACS - Upto 80 x T1, 120Mbps Digital Access Cross Connect Switch


The VCL-MX Version 6 DXC 80 T1, 120Mbps Digital Access Cross Connect Switch, is a modular switch that may be scaled from 8 T1 Ports to up to 80 T1 Ports. The VCL-MX Version 6, T1 DACS (T1 DXC) offers full cross-connect functionality to cross-connect between 64Kbps time-slots (DS-0s), “n"x64 Kbps consecutive DS-0s and Fractional T1 channels to full T1 channels.

The VCL-MX Version 6 DXC 80 T1, 120Mbps Digital Access Cross Connect Switch, occupies 6U high (266 mm) rack-space and is a complete 19-inch standalone unit that provides a 64Kbps time-slot (DS-0) cross-connect fabric for up to 80 T1 ports. This product offers 1+1 -48V DC Power Supply Redundancy, 1+1 Control Card and Processor Redundancy, 1+1 Cross-Connect (TSI) Redundancy, 1+1 Timing (Synchronization Clock Circuitry) Redundancy. This DXC offers “user selectable” clock / timing synchronization priority. The Dual Power Inputs allow the equipment to be powered from two separate power sources. AC input external adapter is an optional for AC mains operation.

  • Data Sheet (PDF)
  • Key Features and Highlights

    • 120Mbps, 80 T1 fully non-blocking cross-connect at 64Kbps (DS-0) level (1920 DS-0 any to any time-slot cross-connect)
    • Scalable from 8 T1 Ports to 80 T1 Ports
    • 1+1 Control Card Processor Redundancy
    • 1+1 Cross-Connect / TSI Redundancy
    • 1+1 Timing (Synchronization Clock) Redundancy
    • 1+1 -48V DC Power Supply Redundancy (Dual Power Input allows the equipment to be powered from two separate -48V DC sources)
    • Bit Error Rate (BER) monitoring BER thresholds to generate BER alarms automatically whenever alarm limits are exceeded
    • Telnet remote access
    • SNMP traps
    • Maintains Access Security Log
    • USB and RS232, Interface for local connection through the serial interface to the "Network Control and Management Software”
    • User Selectable Internal, External and Loop-timed clock synchronization priority options
    • Local and remote loopback facility.

    OAM Features

    OAM: Operation and Management Ports

    • RS232 Serial Port
    • USB COM Port
    • 10/100BaseT Ethernet for remote access.

    Security and Protection

    • Secured Access via SSH V2
    • Password Protection: Password Protection in compliance with the mandatory clauses of the GR-815-CORE-2 specifications for secured access control.
    • Logging: Maintains a log of all successful and un-successful attempts.
    • Logged information includes the ID and the IP address of the accessing entities.
    • Alerts the administrator if the un-successful logging attempts exceed three.
    • Security Audit: All access logs for up to 30 days are maintained for security audit purposes.
    • Security log entry of any request or activity including that user-ID (including IP address, if applicable), to establish user accountability.
    • Report Generation / Audit Trail.
    • Security Administration.

    Timing (Clock) Synchronization

    Timing Options Internal Clock, Loop-Timed Clock, External Clock. User selectable synchronization priority
    Synchronization Sources Internal Clock, span clock timing derived from incoming T1 links (Loop-Timed), External Clock, 75 Ohms (TTL), or 1.544 Mbps (100 Ohms BITS clock)
    Default Option Internal Clock

    System Architectural Details

    VCL-MX Version 6, is a scalable DXC that may be used to cross-connect at DS-0 (64Kbps time-slot level) from 8 T1 Ports to 80 T1 Ports (120Mbps). The VCL-MX Version 6 DXC has a multi-slot chassis with TDM backplane. In the chassis, there are ten (10) T1 interface card slots. Each T1 Interface Card has 8 T1 Ports.

    Two slots are reserved for 1+1 redundant control cards, which includes the redundant cross connect, processor, TSI and clock synchronization / timing functions. One dedicated slot exists for an OAM card and two slots for 1+1 redundant power supply cards.

    Chassis / System Backplane

    All connections are made at the rear of the chassis, providing interconnections between the various plug-in cards and to the network. VCL-MX Version 6 - 80 T1, 120Mbps Digital Access Cross Connect Switch supports high-density T1 interface cards.

    An extensive set of alarms, for easy maintenance are provided in the system.

    System Management

    VCL-MX Version 6 – 80 T1, 120 Mbps Digital Access Cross Connect Switch offers a variety of management options. The equipment may be configured using CLI (English text) commands, or a GUI (Graphical User Interface). The management and configuration commands may be executed from a VT100 terminal, Windows HyperTerminal, any DOS-based system, Linux or UNIX based system, or Telnet (remote configuration and management).

    The equipment provides a wide choice of access ports for connecting to and executing management and configuration commands through its OAM Card.

    The OAM card provides

    • COM Port (RS232 Serial Port).
    • USB Port
    • 10/100BaseT Ethernet Port (each multiplexer may be assigned an IP address and connected to a LAN / IP network for remote access and management through the 10/100BaseT Ethernet Port for out-of-band configuration, management and access).

    Status Monitoring

    • Synchronization Clock Selection
    • Status of alarms
    • Enabled/Disabled status of 1.544 Mbps T1 ports
    • Monitoring the 80 Port T1 DACS status and configuration
    • Monitoring of T1 Link status: LOS, LOF, AIS, RA

    Alarm status and monitoring

    • Loss of incoming signal at all 1.544 Mbps T1 Ports
    • Configuration error alarm

    LED indications

    • 1 to 80 T1 Ports LED indicators
    • 5V DC present
    • -48V DC present
    • Configuration error.

    External Alarm - Contact Closures

    • 1 Alarm relay Type - Form “C”

    Application Diagrams

    Application # 1

    T1 DXC / T1 DACS - Upto 80 x T1, 160Mbps Digital Access Cross Connect Switch

    Application # 2

    T1 DXC / T1 DACS - Upto 80 x T1, 160Mbps Digital Access Cross Connect Switch

    Data Sheet

    Data Sheet (PDF)