Nortel NT1R20, Description

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Description Page 19 of 290
Line cards Description
The Meridian 1 switch communicates with IPE modules over two separate
interfaces. Voice and signaling data are sent and received over DS-30X loops,
and maintenance data is sent over a separate asynchronous communications
link called the card LAN link.
Signaling data is information directly related to the operation of the telephone
line. Signaling commands include, but are not limited to the following:
— off-hook/on-hook
— ringing signal on/off
— message waiting lamp on/off
Maintenance data is data relating to the setup and operation of the IPE card,
and is carried on the card LAN link. Maintenance data includes, but is not
limited to the following:
— polling
— reporting of self-test status
— CPU initiated card reset
— reporting of card ID (card type and hardware vintage)
— reporting of firmware version
— downloading line interface unit parameters
— reporting of line interface unit configuration
— enabling/disabling of the DS-30X network loop bus
— reporting of card status or T1 link status
DS-30X loops
The line interfaces provided by the line cards connect to
conventional 2-wire (tip and ring) line facilities. IPE analog line cards convert
the incoming analog voice and signaling information to digital form and route
it to the Meridian 1 common equipment (CE) CPU over DS-30X network
loops. Conversely, digital voice and signaling information from the CPU is
sent over DS-30X network loops to the analog line cards where it is converted
to analog form and applied to the line facility.