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ISL installation for all systems
553-2901-200 Standard 11.00 August 1996
Dedicated mode using PRI/DTI trunks
In this configuration, the DCHI or MSDL is connected to a High Speed Data
Module (HSDM) or Asynchronous/Synchronous Interface Module (ASIM).
See
. The HSDM or ASIM is connected to a Data Line Card (DLC).
The call is then connected to the far end through the DLC to DTI trunk path.
To establish the D-channel in this configuration, set up the HSDM or ASIM
at one end in hot line mode. The hot line DN must be coordinated with
personnel at the far end, then programmed in LD 11. The preprogrammed hot
line DN is dialed by the Meridian 1. If the call cannot be established, the
Meridian 1 continues to dial the hot line number continuously until the call is
connected.
Set the HSDM or ASIM in synchronous mode. A data rate of 9.6 Kbps is
recommended because it provides internal error detection and correction. The
following data rates are also supported: 1.2 Kbps, 2.4 Kbps, 3.6 Kbps,
4.8 Kbps, 7.2 Kbps, 14.4 Kbps, 19.2 Kbps, 38.4 Kbps, and 56 Kbps for
ASIM. The High Speed Data Module (HSDM) supports 64 Kbps.
Note:
This configuration is the least reliable because of the lockup
problems inherent in smart modems from power splices and noisy lines.
To increase the reliability of this configuration, a constant power source
can be used when powering the modems. Also ensure that the tie lines
meet data grade specifications. Northern Telecom takes no responsibility
for ISL D-channel outages due to modem lockup.