T1/E1 PRI ISDN Standard Compliant Source Code

Target Applications

• Single and Multiple-span T1/E1
• T1/E1 and M13 multiplexers
• PBX and Channel Bank
• ISDN/PRI HDSL transport
• VoIP (Voice over IP)
• Router/GatewayProtection Switching

PRI ISDN Features & Benefits

• NComm's PRI ISDN software accommodates a wide variety of hardware configurations
  
• D channel signaling may be run on selected DS0 channels of any T1 span
  
• Works with any Real Time Operating
  System and processors including multiprocessor environments
  
• The package provides a complete implementation of LAP-D and well defined APIs that greatly reduce the inherent complexity of a PRI ISDN implementation
  
• Produces a complete, standard compliant PRI CPE interface
  
• All source code provided is ANSI-C making any required or desired customizations easy to complete
  
• Accommodates a wide variety of hardware configurations
  
• NComm’s PRI ISDN is pre-integrated with NComm’s T1 TMS even further reducing project engineering time.

General PRI ISDN Software Overview

NComm’s Primary Rate ISDN package provides a complete and completed software solution for the implementation of NI-2, 5ESS, 4ESS and DMS100 PRI ISDN on the Customer Premise Equipment side of the network. It will meet the preponderance of SR-NWT-002343 (Issue 1, June 1993) with regard to all overhead functions establishing and controlling circuit and packet mode PRI. Not including in this implementation are packet protocols used within the data channels (e.g. X.25), V.110/V.120 rate adaptation and related
dedicated services.

Layer 1 Description

For Layer 1 implementation, NComm offers its well known T1 Trunk Management software (TMS) for a complete T1 PRI ISDN solution.
TMS is complete in providing full standard compliant T1 including alarms per T1.2321 and
maintenance per T1.231 as well as TR-54016. This software is RTOS, processor and framer
independent, and pre-integrates with the Layer 2/3 software.

PRI ISDN Layer 2 Description

The PRI ISDN sotware complies with recommendation Q.921, the Layer 2 software module implements Link Access Procedures for D-Channel (LapD).

PRI ISDN Layer 3 Description

NComm’s PRI ISDN Q.931 Layer 3 module software implements the Protocol Control portions of the layer 3 as defined in the Q.931 recommendation. The Call Control software module, one of the Layer 3 Protocol Modules, implements B-Channel management and Q.931 message and information element parsing and validation for National ISDN-2 switch types. Multiple PRI circuits can run and be controlled with a single NComm PRI ISDN stack.