Card Interfaces - Meridian Nortel 1 Option 11C Technical Reference Manual

NT1R20 Off Premise Station (OPS) analog line card

Card interfaces

Voice and signaling interfaces
The eight line interfaces provided by the OPS analog line card connect to
conventional, 2-wire (tip and ring), analog line facilities. Incoming analog
voice and signaling information from a line facility is converted by the OPS
analog line card to digital form and routed to the CPU over DS-30 network
loops. Conversely, digital voice and signaling information from the CPU is
sent over DS-30 network loops to the OPS analog line card where it is
converted to analog form and applied to the line facility.
The OPS analog line card uses only eight of the 30 available timeslots for its
eight line interfaces. The OPS analog line card can be configured in software
to format PCM data in the µ-law or A-law conventions.
Maintenance communications
Maintenance communications is the exchange of control and status data
between line or trunk cards and the CPU. Maintenance data is transported via
the card LAN link.
The card LAN link supports the following functions on the OPS analog line
card:
• polling
• reporting of self-test status
• CPU initiated card reset
• reporting of card ID (card type and hardware vintage)
• reporting of firmware version
• reporting of line interface unit configuration
• enabling/disabling of the DS-30X network loop busy
• reporting of card status
Power interface
Power is provided to the OPS circuit card by the NTAK78 AC/DC or
NTAK72 DC power supply.
Option 11C and 11C Mini
Page 425 of 544
Technical Reference Guide