Digital Access Cross Connect Switch

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”