Avaya Nortel Communication Server 1000 Reference page 62

Overview
• 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.
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
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 clock frequency supplied by the controller card). The
timeslot repetition rate for a single channel is 8 kHz. The controller card also supplies a locally
generated 1 kHz frame sync signal for channel synchronization.
Signaling data is transmitted to and from the trunk cards using the call signaling bit within the
10-bit channel. When the line card detects a condition that the switch needs to know about, it
creates a 24-bit signaling word. This word is shifted out on the signaling bit for the associated
channel one bit at a time during 24 successive DS-30X frames. Conversely, when the switch
sends signaling data to the line card, it is sent as a 24-bit word divided among 24 successive
DS-30X frames.
62 Circuit Card Reference
Figure 12: DS-30X loop data format
Comments? infodev@avaya.com
on page 63.
July 2011