Data Sheet

High-Speed
Data Module (HDM)

The High-Speed Data Module (HDM) is a circuit data module for Cisco IGX 8410, IGX 8420, and IGX 8430 wide-area switches.

Data interfaces are protocol transparent— asynchronous, binary synchronous, and bit synchronous protocols are supported with no impact on host or terminal software.

The HDM uses a 68000 processor to support the following functions:

• Repetitive Pattern Suppression (RPS)
  
  
• Flexible clocking
  
  
• Monitoring and control of data leads
  
  
• Lead-triggered jobs
  
  

Repetitive Pattern Suppression

On synchronous and asynchronous connections (up to 128 kbps), RPS enhances bandwidth efficiency by removing repetitive patterns from the bit stream and then reconstructing the bit stream at the receiving end.

Flexible Clocking

The HDM provides for external or internal clocking on a port-by-port basis. The clocking circuitry measures the frequency of incoming clocks and adjusts the outgoing clock at the other end of the network. This is useful when connecting remote devices to an IGX 8400 network.

Monitoring and Control of Data Leads

This feature enables you to view real-time control leads on any data port of any node from the network management station, thereby providing a powerful means of configuration and problem resolution. You can also configure an IGX 8400 switch to use a change in lead on a circuit data interface at one end of a connection to condition the interface at the other end of the network.

Lead-Triggered Jobs

Lead-triggered jobs enable you to dynamically set up bandwidth-on-demand connections across the WAN. You can execute pre-defined scripts upon command, at a preset time interval, or by failure or repair of a trunk or channelized port. These configurable jobs are ideal for establishing video connections and for disaster recovery applications.

Technical Specifications

Hardware

• 68000 processor
  
  
• 128 kbytes of flash memory
  
  
• 512 kbytes of RAM
  
  

Physical Layer