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Cisco BTS 10200 Instalační příručka Strana 8

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CISCO CONFIDENTIAL
8
Cisco BTS 10200 Softswitch — Release Notes for Release 3.3 V04
OL-1835-04
New and Changed Information
T108 Test Line Support
The T108 test line feature is used for determining the performance of trunks connecting digital exchange
switches, including voice over packet (VoP) softswitches. Currently, Cisco BTS 10200 incoming trunks
requesting 100-type test lines are routed to shared test lines for the requested tests, regardless of which
gateway terminates the trunk or which gateway/IAD terminates the test line. The T108 test line feature
requests a test to be performed within the same gateway where the trunk under test (TUT) is terminated,
and provides a digital loopback within the gateway. The T108 test line feature supports manual and
automated testing.
Figure 1 T108 Test Line Operation
The T108 test line sequence is as follows:
• The near end switch originates the test sequence by placing a test call, identifying the trunk to be
selected, and the test line number. A digital test pattern generator, such as a Sage 930A, is used in
the test setup shown in Figure 1.
• The near end switch uses the trunk identifier to override normal call processing and select only the
requested trunk.
• The far end switch responds to the destination number and connects to the T108 test line. The T108
test line enables a digital loopback.
• When the near end receives answer supervision, it conducts digital test sequences to ascertain trunk
performance.
• Once the test sequences are completed, the near end releases the test call and both switches release
the trunk connection.
• The far end switch can detect if the test connection exceeds a preset time, and releases the test
connection if the preset time is exceeded.
The T108 test line is also used for trunk redirection (wholesale dial) for Internet services where the
carrier modem termination is integrated into the trunk gateway. In this case, the integral digital stored
program (DSP) normally supports modem-only transmissions.
Trunk
Termination
ROTL
Or
Test
Position
Trunk Circuit
Switch
Matrix
Transmission
Facility
OutgoingIncoming
Near End
Switch
Far End
Switch
Trunk
Termination
108
Test
Line
Digital
Test Receiver
Digital Test Pattern
Generator
Test Controller
(Optional)
Remote or Local
Test System
OutgoingIncoming
Trunk
Termination
ROTL
Or
Test
Position
Trunk Circuit
Switch
Matrix
Switch
Matrix
Transmission
Facility
OutgoingIncoming
Near End
Switch
Far End
Switch
Trunk
Termination
108
Test
Line
108
Test
Line
Digital
Test Receiver
Digital Test Pattern
Generator
Test Controller
(Optional)
Remote or Local
Test System
OutgoingIncoming
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