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50 Overview
Maintenance data is data relating to the configuration and operation of
the IPE card, and is carried on the card LAN link. Some examples of
maintenance data are as follows:
•
polling
•
reporting of self-test status
•
CPU initiated card reset
•
reporting of card ID (card type and hardware vintage)
•
reporting of firmware version
•
downloading trunk interface unit configuration
•
reporting of trunk interface unit configuration
•
enabling/disabling of the DS-30X network loop bus
•
reporting of card status
DS-30X loops The interfaces provided by the line and trunk cards connect
to conventional 2-wire (tip and ring) line facilities. IPE analog line and
trunk cards convert the incoming analog voice and signaling information to
digital form, and route it to the 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 and trunk cards
where it is converted to analog form and applied to the line or trunk 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 (or the
controller circuits on a network/DTR card in a CE module). A DS-30X
network loop is composed of two synchronous serial data buses. One bus
transports in the transmit (Tx) direction toward the line facility and the other
in the receive (Rx) direction toward the common equipment.
Each bus has 32 channels for pulse code modulated (PCM) voice data.
Each channel consists of a 10-bit word. See Figure 12 "DS-30X loop data
format" (page 51).
Eight of the 10 bits are for PCM data, one bit is the call signaling bit, and
the last bit is a data valid bit. The 8-bit PCM portion of a channel is called a
timeslot . The DS-30X loop is clocked at 2.56 Mbps (one-half the 5.12 MHz
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.