Octel XC1000, Service Manual

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INTRODUCTION
1-5 Edition One XC1000 Service
1.2.3 Switch Integrations
XC1000 supports four types of integration: (1) RS-232 integrations, which use
separate simplified message desk interface (SMDI) data links to the main
distribution board or to the asynchronous communications processor (ACP),
if equipped; (2) in-band integrations, which use ATIC or E&M tie lines or T1
trunks (the ATIC can be used “dry circuit” for some integrations); (3) ad-
vanced, R2 in-band integrations, over a digital transmission facility that
multiplexes several channels onto a single transmission medium and supports
up to 30 DLC voice channels; or (4) common channel signaling/signaling
system 7 (CCS/SS7) integrations.
When the switch is integrated with the XC1000, callers are forwarded
directly to the subscriber’s personal greeting when the subscriber’s
telephone number is busy or does not answer. If the switch is not
integrated with the XC1000, the switch and XC1000 must be
interfaced .
That is, when a call is made to a telephone number that is busy or does
not answer, XC1000 answers the call and the caller must reenter the
subscriber’s number at the XC1000 main greeting.
1.2.3.1 RS-232 Integrations. XC1000 supports two data-link configurations,
providing terminations for three separate SMDI data links in a standard
configuration or up to 16 data links with the optional ACP. The switch
transmits the subscriber’s telephone number to XC1000 through a data
link when the switch forwards a call to XC1000. XC1000 matches the call
at the port with the called subscriber’s number, prompts the caller to leave
a message, and stores the caller’s message in the subscriber’s mailbox.
XC1000 returns a data message to the switch through the data link for the
switch to turn on the message-waiting indicator on the subscriber’s
telephone.
Each data link connects to a 25-pin RS-232 connector located on the main
distribution board or ACP I/O distribution board, if equipped, at the rear of
cabinet 1. The data link connects directly to an ACP card that controls the
operation of the data link.
1.2.3.2 In-Band Integrations. For in-band integrations, the switch provides the
called-party ID to a XC1000 port via DTMF signals, using the same ATIC or
E&M tie line or the same T1 channel that is selected when a call is forwarded
to XC1000. The called-party ID precedes the call.
1.2.3.3 R2 Integrations. R2 is a multifrequency in-band tone signaling plan that
sends integration data (calling and called number ID, for instance) over the
same channel used for voice connection. R2 is an enchanced version of
DTMF in-band integration. The protocol follows International Telegraph
and Telephone Consultative Committee (CCITT) standards.
SECTION 1.2