Octel XC1000, Service Manual

Page: 462 / 889

COMPONENT DESCRIPTIONS
10-34 Edition One XC1000 Service
SMDI DATA
CPU
SERIAL BUSES
(DATA AND CONTROL)
SWITCH
MULTILINE HUNT GROUP
LINE CARD GROUP 1
ATIC DLC
ATIC DLC
PCM BUS
PORTS
LINE CARD GROUP 2
LINE CARD GROUP3
ACP
MONITOR
CARD
RDAC
AND REMOTE
ALARMS
SMT
SCCS
MSG FILE SYS FILE
MSG
DRIVES
SYS
DRIVES
(OPTIONAL)
Figure 10-18. Switch/XC1000 Call Flow.
The call-flow sequence used with the switch and the XC1000 is shown in
the following steps:
1. When a call is forwarded to XC1000, the switch sends a ring signal to
a TIC port. The TIC detects the ring signal on one of its ports and
raises a flag to indicate an incoming call.
2. The DLC associated with the TIC polls the TIC for a change of status,
through the PCM bus that connects the DLC and TIC. When the DLC
detects the flag raised by the TIC, the DLC notifies the CPU.
3. At the same time, the CPU receives, through the SMDI data link,
information identifying the calling party, called party, and incoming
port. The CPU notifies the DLC to command the TIC to go off-hook
and answer the incoming call.
4. The CPU instructs the message-file card to find the greeting of the
called party, retrieve the greeting, and pass it to the DLC. The CPU
also instructs the system-file card to send digitized voice prompts over
the data bus to the DLC.
5. The DLC passes the prompts to the TIC. With analog input, an analog
TIC converts all prompts and greetings to analog signals and passes
them to the caller. With digital input, a digital TIC passes the
digitized data to and from the DLC.
6. The DLC listens for digitized DTMF tones, silence, or a dial tone and
informs the CPU of the call progress. If the caller records a message,
the analog TIC digitizes the analog speech and sends the data stream
over the PCM bus to the DLC. A digital TIC passes the digital data
stream straight through to the DLC.
SECTION 10.9