Avaya Nortel Communication Server 1000 Reference page 37

Line cards
Figure 2: Typical IPE analog line card architecture
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 Call Server over DS-30X network loops. Conversely, digital
voice and signaling information from the Call Server 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.
IPE digital line cards receive the data from the digital phone terminal as 512 kHz Time
Compressed Multiplexed (TCM) data. The digital line card converts that data to a format
compatible with the DS-30X loop and transmits it in the next available timeslot. When a word
is received from the DS-30X loop, the digital line card converts it to the TCM format and
transmits it to the digital phone terminal over the digital line facility.
A separate dedicated DS-30X network loop is extended between each IPE line/trunk card and
the controller cards within an IPE module. A DS-30X network loop is composed of two
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