INSTALLATION
E-Lead
Loss of Sync
The M-lead input at one end is normally conveyed to the E-lead output at
the other end with no more than one millisecond of timing distortion.
When the CELP Voice Channel Module card loses end-to-end
synchronization, the E-lead is conditioned according to Table 2-8.
TABLE 2-8. OPTION SELECTION, E-LEAD CONDITION UPON LOSS OF SYNC
Dip Switch
Settings
Feature
S1-6
S1-7
Application
Force E-lead to Idle
ON
ON
Forces the E-lead to Idle when either the multiplexer or CELP Voice Channel
Module declare loss of end-to-end synchronization. This option terminates the
call in E&M applications or when used with Tellabs PLAR (Private Line Automatic
Ringdown), preventing false rings.
Force E-lead to Busy
OFF
ON
Forces the E-lead to Busy when either the multiplexer or CELP Voice Channel
Module declares loss of end-to-end synchronization. This option will cause the
circuit to be busy, preventing further calls.
Freeze E-lead
ON
OFF
Freezes the E-lead when either the multiplexer or the CELP Voice Channel
Module declares loss of end-to-end synchronization until synchronization is
restored again. This option attempts to hold the call on a PBX. This option is not
recommended for the CELP module since the state of the E-lead is not reliable at
the instant of freezing.
Disconnect the Call
OFF
OFF
This option is recommended when operating on the analog tie-lines (trunk lines)
of PBXs. This option causes the call to be terminated and the line "busied" out to
prevent furthur access upon loss of end-to-end synchronization. The E-lead
goes Idle for 3 seconds to terminate the call. Then the E-lead goes busy for a
minimum of 3 seconds and stays busy until the restoral of end-to-end
synchronization.
2-8
