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T1/E1 PRI ISDN Standard Compliant Source Code

NComm’s Primary Rate Integrated Services Digital Network (T1/E1 PRI ISDN) protocol stack brings the same flexibility and portability found in NComm’s Trunk Management Software. This updated package is architected for integration with both NComm’s T1/E1 TMS and other T1/E1 implementations. The first switch-type supported are NISDN-2, 5ESS, 4ESS, DMS100 and Euro-ISDN, user side. NComm’s T1/E1 PRI ISDN software stac provides the layer 2 Q.921 and layer 3 Q.931 D channel signaling required for T1/E1 PRI network interfaces. Both User- and Network-Side PRI are supported. As with all NComm TMS offerings, the T1/E1 PRI ISDN software package includes easy to use APIs for all communications between the package and other parts of the customers system. Clear design guidelines are included for various system design choices and hardware architectures yielding both very fast project completion while maximizing engineering flexibility.

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.