2-2 NT5K18 Exchange Line Trunk Card
553-3001-173 UK Trunk cards description
Common features
The NT5K18 Exchange Line trunk card:
•
allows trunk type to be configured on a per unit basis
•
indicates self-test status during an automatic or manual self-test
•
provides card-identification for auto configuration, and for
determining the serial number and firmware level of the card
•
converts transmission signals from analog-to-digital and from digital-
to-analog
•
provides complex terminating impedance in compliance with
regulatory UK standards
•
provides complex balance impedance in compliance with regulatory
UK standards.
Microprocessor
The NT5K18 Exchange Line trunk card is equipped with an Intel 8052-
type microprocessor which controls card operation. The microprocessor
also provides the communication function for the card.
The NT5K18 Exchange Line trunk card communicates with the controller
card through a serial communication link. Features provided through the
link include:
•
card-identification
•
self-test status reporting
•
status reporting to the controller card
•
maintenance diagnostics.
Signalling and control
The signalling and control portion of the NT5K18 Exchange Line trunk
card operates with the CPU to control the card hardware. The card
receives messages from the CPU over a signalling channel in the DS-30X
loop and returns status information to the CPU over the same channel. The
signalling and control portion of the card provides the means for analog
loop terminations to establish, supervise, and take-down call connections.
United Kingdom
United Kingdom
United Kingdom
United Kingdom
United Kingdom
United Kingdom
