
112 Chapter 6 Configuring resources — media bay modules
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Figure 26 T1 parameters
Interface levels
The default Interface levels are the ISDN loss plan settings.
Check with your telecommunications service provider to determine if your BCM system is
connected to a central office (CO) with digital network loss treatment (ISDN I/F levels) or analog
network loss treatment (PSTN I/F levels).
The ISDN setting requires digital access lines (DAL) that have digital network loss treatment. On
a DAL network, the PBX system administers the dB loss not than the CO. DALs may have ISDN
signaling or digital signaling (for example, T1). The loss plan follows the Draft TIA-464-C loss
plan, which uses a send loudness rating (SLR) of 8 dB. You must contact your service provider to
get DAL network loss treatment on a line with digital signaling.
Table 21 T1 parameters
Attribute Value Description
CO fail TIA-547A or TR62411 Select the carrier failure standard used by your T1 or PRI service
provider. Consult your T1 or PRI service provider for the proper setting.
Interface levels ISDN or PSTN Define a loss plan setting. For more information, see “Interface levels” on
page 112.
Framing ESF or SF Select the framing format used by your T1 or PRI service provider:
Extended Superframe (ESF) or Superframe (SF). Contact your T1 or
PRI service provider for the proper setting. (SF or Superframe is
sometimes known as D4.)
Line coding B8ZS or AMI Define the encoding signals on a T1 line. Select the standard used by
your T1 service provider. Contact your T1 service provider for the proper
setting.
Internal CSU On or Off Turn the internal T1 channel service unit (CSU) on or off. For more
information, see “Internal CSU” on page 113.
CSU line build 0, 7.5, or 15 dB Set the gain level of the transmitted signal. This setting appears only
when the Internal CSU is set to On.
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