NT5K18 Exchange Line Trunk Card 2-3
UK Trunk cards description 553-3001-173
Signalling interface
Trunk signalling messages are three bytes in length. The messages are
transmitted in channel zero of the DS-30X in A10 format.
Configuration information for the NT5K18 Exchange Line Trunk Card is
downloaded from the CPU automatically during power-up or manually by
commands from maintenance programs.
Physical description
A physical description of the NT5K18 Exchange Line trunk card is given
below.
measurements
Each NT5K18 Exchange Line trunk card measures as follows:
He ig ht:
318 mm (12. 5 i n. )
De pth:
254 mm (10 in .)
Connections
The NT5K18 Exchange Line trunk card has eight units. Each trunk unit on
the card connects to the backplane through an 80-pin connector. The
backplane is cabled to the input/output (I/O) panel, and the I/O panel is
cabled to the cross-connect terminal. At the cross-connect terminal, each
unit connects to external apparatus by A and B leads. For detailed
termination and cross-connect information, see System installation
procedures (553—3001—210).
Self-test
When the card is installed, the red Light Emitting Diode (LED) on the
faceplate flashes as the self-test runs. If the self-test completes
successfully, the card is automatically enabled (if it has been configured in
software) and the LED goes out. If the self-test fails, the LED will remain
lit. The LED will also remain lit if one or more units on the card become
disabled while the card is operating.
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