Browse Prior Art Database

Simple Modification to Channelize a 2 Mbps Fat Pipe Communication Adapter

IP.com Disclosure Number: IPCOM000120857D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 3 page(s) / 81K

Publishing Venue

IBM

Related People

Calvignac, J: AUTHOR [+2]

Abstract

The High Speed Communication Scanner (HSCS) of communication controller products is a single channel (fat pipe) adapter. This article describes a simple modification of the communication controller in order to allow a connection of channelized interfaces to this adapter.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 62% of the total text.

Simple Modification to Channelize a 2 Mbps Fat Pipe Communication
Adapter

      The High Speed Communication Scanner (HSCS) of
communication controller products is a single channel (fat pipe)
adapter. This article describes a simple modification of the
communication controller in order to allow a connection of
channelized interfaces to this adapter.

      The connected channelized interfaces are:
-  ISDN Primary access composed of 30 "B" channels and one "D"
channel (Europe), or 23 "B" channels (United States).
-  Channelized T1 composed of 24 channels (United States).

      In order to minimize the modifications, the HSCS hardware
adapter is kept unchanged, and a front end module (FEM) is placed
between the line interface coupler (LIC) and HSCS adapter (see Fig.
1). Only the adapter microcode is modified in order to recognize the
specific channels and to interface the communication controller
system code accordingly.
Front End Module functions:

      The Front End Module performs the transcoding of 32 physical
"B" channels recognized by the Line Interface Coupler to a SDLC frame
multiplex of 32 addresses mixed on the single HSCS flow (as shown in
Fig. 2).
      Receive flow:

      When a frame is received on a given "B" channel by the Line
Interface Coupler, the Front End Module "sticks" on this frame the Ai
label, this label is corresponding to the address of the "B" channel
(i is from 0 to 31).

      This Ai label is used by the HSCS m...