Specifications

Chapter 3 Testing & Diagnostics
3-5
jack should be set in the bridged (high impedance) mode to avoid loading-down the T1 signal coming
from the Access Bank.
The Input Monitor jack connects directly across the DS1 signal received by the Access Bank from the T1
line. This allows in-service monitoring of the signal being received from the network. The receive pair at
the Access Bank RJ-48C (T1 Line modular jack) remains connected at pins 1 and 2 to the line. T1 test
equipment plugged into this jack should be set in the bridged (high impedance) mode to avoid loading-
down the signal coming from the T1 line.
Test Tone Switch - T1 Control Switch #7
When the TEST Tone switch and TP Busy/Idle switch is On, an internally generated 1kHz Digital
Milliwatt signal will be received by all 24 channels. This is useful for tone alignment and to isolate
transmission failure problems between the Access Bank and connected switching equipment. This switch
should always be Off for normal Access Bank operation. Please disconnect any telephones before
conducting this test!