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ISDN-TRK (DS1 ISDN Trunk)
Issue 1 June 2005 1467
Figure 81: Outgoing ISDN-PRI Test Call
There are two methods available to place an outgoing ISDN-PRI test call.
In the first method, the test call connection is established over the TDM Bus of the transmit and
receive sides of the ISDN-PRI trunk to a data channel. This method is selected when no
Maintenance/Test circuit pack resides in the system.
In the second method, the test call connection is established over the TDM Bus of the transmit
and receive sides of the ISDN-PRI trunk to a digital trunk testing port on the Maintenance/Test
circuit pack. The Maintenance/Test Digital Port generates a pseudo bit stream. A pictorial
description of the outgoing ISDN-PRI test call connectivity is contained in Figure 82: ISDN-PRI
Outgoing Test Call on page 1468.
DS1 Facility
ISDN Trunk
(B-Channel)
UDS1
TN464
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M/T
TN771
G3r Switch originating test call
TDM Bus
Far-End Switch
with test call
terminating capability
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