
System parameters reference 159
Nortel Business Communications Manager 5.0
Configuration — System
NN40170-501 02.04 Standard
September 2009
Copyright © 2009, Nortel Networks
Configuring DTM-T1/E1 module parameters
Clock Source: Determine how the module functions for timing on the network.
• Primary External: The network connection from where the system collects
all the clocking information.
• Secondary External: A backup for the Primary clock source.
• Internal: Uses the clocking derived from the Primary connection.
Attention: Changing the clock source can disconnect calls. If you change
the clock source for your system, you can cause your system DTM
interface(s) to reset, resulting in dropped calls. Choose a suitable time to
change the clock source and use the Page feature to inform users of possible
service disruptions.
CO fail: Use the carrier failure standard used by the service provider (TIA-
5474, TR62411).
Interface levels: Choose the loss plan setting supported on the lines (ISDN,
PSTN).
Framing: Choose the framing format supported by the service provider (ESF,
SF).
Internal CSU: Turn the internal channel on or off.
Attention: Disable the module before changing the internal CSU setting.
CSU line build (Internal CSU set to ON): Set the gain level of the transmitted
signal (0, 7.5, 15 dB)
DSX1 build (Internal CSU set to OFF): Set the distance between the system
hardware and the external channel service unit (000-100, 100-200, 200-300,
300-400, 400-500, 500-600, or 600-700 feet)
Line coding: Select the encoding signal used by the service provider (B8ZS,
AMI)
CRC4 (E1 lines only): Set the parameter to match the setting at the other end
of the line.
Configuring DTM-PRI module parameters
Protocol: Set to the protocol used by the CO.
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