Table of Contents
Advertisement
REFERENCE
Asynchronous DTE 7500
Provides the D-channel functionality to allow one associated asynchronous, EIA-232D data
communications equipment (i.e., modem) to interface with the ISDN network using X.25 data
transfer. This mode of operation is intended primarily for use with the X.25 Modem Pooling
feature of the 5ESS.
Provides B-channel circuit-switched Mode 2 (B2) or Mode 2/3 (BA) adaptive data communication
for two-stage modem pooling.
Synchronous DCE 7500
This configurations requires the installation of either the Multipurpose enhancement board or the
High Speed Synchronous enhancement board.
The Multipurpose enhancement board:
Provides a single synchronous EIA-232D (on the main board) with RS-366 Automatic Calling Unit
interface (on the enhancement board) supporting data rates up to 19.2 kbps. The RS-366
functionality need not be utilized, but the Multipurpose enhancement board is still required.
Provides for the transport of 56 or 64 kbps internally timed synchronous data over one circuit-
switched B channel or 56/64 kbps X.25 data on a nailed-up B channel.
An external adapter is required to supply a V.35 or RS-449 interface 56 kbps or 64 kbps
operation. Such devices are advertised for sale in general trade data communications
catalogs.
Provides for manual initiation of synchronous data calls and selection of previously stored data
repertory from the LCD interface.
The High Speed Synchronous enhancement board:
Provides a single synchronous 25-pin male interface on the enhancement board supporting data
rates of 48, 56, and 64 kbps.
An external passive adapter cord supplied with the enhancement board converts the 25-pin male
connector to an industry standard 34-pin V.35 interface. No connection should be made to Port 1
when the High Speed Synchronous option is installed.
Provides for manual initiation of synchronous data calls and selection of previously stored data
repertory from the display interface.
148
Advertisement
Table of Contents
