Specifications

Chapter 3 Testing & Diagnostics
3-7
Channel Test/Busy Switches
Normal setting for the channel busy switches is in the off position, or
toward the right.
1. The channel busy switch performs three functions on an
individual channel. Switching this to On will send 4 seconds of
ringing (85 V) to the Tip and Ring connector to test individual
circuit integrity. A test telephone connected to the punch down
block should ring for 4 seconds. The tip will then be grounded
until the busy switch is turned off.
2. The network will receive 4 seconds of ringback tone,
corresponding to the 4 seconds of ringing on the Tip and Ring
connector. This is useful for network technicians troubleshooting
audio problems.
3. The channel will busy out toward the T1 network side after the 4
seconds of ringback.
The Idle/Busy switch will provide ringing during Trunk processing or even
if the T1 is disconnected.
If the Access Bank is in Self Test, activating the Test/Busy Switch will
ring the channel for 4 seconds and then turn the channel LED RED. This
will allow a technician to ring the telephone and verify audio tone when it
is answered. The RED channel LED does not indicate a channel problem
during Self Test.
Channel 22
Channel 21
Channel 20
Channel 19
Channel 18
Channel 17
Channel 16
Channel 15
Channel 14
Channel 13
Test 20
Test 19
Test 18
Test 17
Test 16
Test 15
Test 14
Test 13
TP Busy/Idle
Option C
Option B
Option A
Test 12
Test 11
Test 10
Test 9
Channel 12
Channel 11
Channel 10
Channel 9
Channel 8
Channel 7
Channel 6
Channel 5
Channel 4
Channel 3
Channel 2
Channel 1
Test 8
Test 7
Test 6
Test 5
Test 4
Test 3
Test 2
Test 1
TP Busy/Idle
Option C
Option B
Option A
Test 24
Test 23
Test 22
Test 21
Channel 24
Channel 23
Test/Busy-out
Switch for
Channels 21-24
Test/Busy-out
Switch for
Channels 17-20
Test/Busy-out
Switch for
Channels 13-16
Test/Busy-out
Switch for
Channels 8-12
Test/Busy-out
Switch for
Channels 5-8
Test/Busy-out
Switch for
Channels 1-4