Lucent Technologies 555-661-140 Testing Trunks, RJ48C/X Interface, Testing Loop-Start Trunks

MERLIN LEGEND Communications System Release 6.1	Issue 1
Installation 555-661-140	August 1998
Connecting the Control Unit to the Network Interface	Page 4-13
Testing Trunks

RJ48C/X Interface

The RJ48C/X interface terminates a DS1 trunk at the customer’s premises. Both RJ48C and RJ48X interfaces have 8-wire modular jacks. However, the RJ48X interface includes shorting bars that loop the DS1 trunk’s receive pair to the transmit pair. This helps in testing the DS1 trunk from the central office.

Testing Trunks

Before you connect the central office trunks to the control unit, verify that there is dial tone and that you can dial out on every trunk. DID trunks can be tested only through the control unit. Do not test DID trunks at this time.

! CAUTION:

Do not use analog multiline telephones or MLX telephones for testing. They do not work for these tests and can be damaged if you use them for this purpose.

Testing Loop-Start Trunks

To perform this test, you need a single-line telephone or an installer’s test telephone (craft set). If you are installing rotary-dial trunks, use a rotary telephone to perform this test.

To test loop-start trunks, follow the steps below:

! Plug the single-line telephone or the craft set into each central office line/trunk jack (either at the network interface or at the cross-connect field) and listen for dial tone.