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ISDN Software Reference for Linux and Windows
446
either purchase one from your supplier or build one yourself. If you are building
your own cable, it must fit the following specifications:
Characteristic Recommendations/Requirements
Cable Type: The recommended cable type is twisted-pair cable in which
each of the two pairs is shielded and the two pairs have a
common shield as well. Shielding helps prevent noise and the
twisting helps prevent cross talk.
Connectors: The cable connects to the board via an ISO8877 Modular
connector on the front or rear bracket of the board. See your
NTU documentation for more information.
When building your NTU-to-board cable, be sure you understand how the NTU
documentation has labeled NTU pinouts for transmit and receive to local
equipment.
Be sure to test your cable after you have built and installed it. The green LEDs on
the rear of the Digital Network Interface board turn on when the board firmware
has been downloaded and the board is receiving clocking and synchronization
information from the network.
NOTE:
If the pinout appears correct but you receive a red and green light, the
transmit and receive may have to be switched on one end.