Signalling And Control; Microprocessor; Signalling Interface; Physical Description - Northern Telecom NT5K17 Description

Signalling and control

Microprocessor

Signalling interface

Physical description

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• Music on Hold access
• Emergency Recorder access.
The signalling and control portion of the trunk card works with the
Meridian 1 Central Processing Unit (CPU) to operate the card hardware.
The card receives messages from the Meridian 1 CPU over a signalling
channel in the DS30X 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.
The microprocessor provides an intelligent interface between an analog
trunk and the Meridian 1 system core.
The NT5K19 Analog Tie trunk card uses the Intel 83C51FA
microprocessor. It contains 8K of Read Only Memory (ROM) and 256
bytes of Random Access Memory (RAM). It operates asynchronously to
the system clock, and is interrupt driven to provide synchronization with
system events.
Signalling messages for the trunk are three bytes in length. The messages
are transmitted in channel zero of the DS30X in A10 format.
Configuration information for the NT5K19 Analog Tie trunk is
automatically downloaded from the Meridian 1 CPU during power up and
manually by commands from maintenance programs.
The physical characteristics of the NT5K19 Analog Tie trunk card are
given below.
Measurements
Each NT5K19 Analog Tie trunk card measures as follows:
He ig ht:
NT5K19 Analog Tie Trunk Card 3-3
318 mm (12. 5 i n. )
UK Trunk cards description 553-3001-173