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Dedicated mode using dialup modem 187
Set the HSDM or ASIM must be 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 1: This configuration is the least reliable due to the lockup
problems inherent in Smart Modems from power splices and noisy lines.
To increase the reliability on this configuration, a constant power source
can be used when powering the modems. Also ensure that the TIE
lines meet data grade specifications.
Note 2: Nortel takes no responsibility for ISL D-channel outages due to
modem lockup.
Figure 74
ISL dedicated mode: using PRI/DTI trunk
QMT11 switch settings
If using the QMT11 ASIM, set the DIP switches, located on top of the unit
under the flip-up, as follows:
•
Hotline, On; See Note 1.
•
Forced DTR, On; See Note 2.
•
FDX (full duplex), On
•
SYNC, On
• INTernal CLK, On
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Copyright © 2003-2007, Nortel Networks
.