Appendix A: Cable description and NT8D81BA cable replacement Page 349 of 378
ITG Trunk 2.0 ISDN Signaling Link (ISL) Description, Installation and Operation
Prevent ground loo p s on connection to externalcustomer LAN equipment
The shielded RJ45 coupler is the connecti on point for the c ustomer’s shielde d
Category 5 LAN cable to the hu b, switch, or rou ter suppo rting the T-LAN and
E-LAN. You must use shielded Category 5 RJ45 cable to connect to the
customer’s T-LAN/E-LAN equipment.
1Connect the customer-provided shielded Cat egory 5 LAN ca ble to t he
external LAN equipment. Ensure that the external LAN equipment is
powered-up.
2Use an ohmmeter to measure resistance to ground between the free
end of the shielded RJ45 cable and building ground.
The ohmmeter
must
measure Open to ground before plugging it into
the shielded RJ45 coupler on the end of the NTMF94DA.
If it does
not
measure Open, you must install the unshielded RJ45
coupler (provided) on the end of the NTMF94DA to prevent ground
loops to external LAN equipment.