Nortel BCM50 Installation Manual page 24

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Configuring DTM-T1/E1 module parameters
• Clock Source: Determine how the module functions for timing on the network (Primary
External, Secondary External, Internal)
Warning: Changing the clock source may disconnect calls.
If you change the clock source for your system, you may 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.
Warning: 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
• Answer timer: Set the minimum period of the answer signal before a call is considered
answered.
• Protocol: Set to the protocol used by the CO.
Warning: Always confirm the line protocol with the head office. Failure to set the
correct protocol could result in erratic service or service failure on the lines.
PRI-T1 supports: NI (NI-1/NI-2), DMS100, DMS250, AT&T4ESS, Sl-1
PRI-E1 supports: ETSI QSIG, Euro, SL-1
Note: SL-1 and ETSI QSIG require an MCDN keycode.
• Protocol type (for SL-1): Select the setting that applies to how the system is seen to the
network. Default is User (the CO or another network node controls the network.
If you want this system to control the network protocol, select Network.
• NSF Extension: None (DMS100/250 switches); WATS (Siemens, ESWD, Lucent 5ESS
switches); ALL (GTD5 and DMS10 switches). For a detailed description, refer to
Module configuration: Trunk modules