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PRI ISDN Standard Compliant Source Code
NComm’s
Primary Rate Integrated Services Digital Network (T1 PRI ISDN) protocol
stack brings the same flexibility and portability found in NComm’s
Trunk Management Software. This new package is architected for
integration with both NComm’s T1 TMS and other T1 implementations.
The first switch-type supported are NISDN-2, 5ESS, 4ESS and DMS100,
user side. NComm’s
T1 PRI ISDN software stack (E1 in planning) provides
the layer 2 Q.921 and layer 3 Q.931 D channel signaling required
for T1
PRI network interfaces. The first release is for CPE/RT
termination. As with all NComm TMS offerings, the T1
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.
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.
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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.
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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. |
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