Avaya S8700 Maintenance Manual page 190

Maintenance Object Repair Procedure
Configurations and Maintenance
In the following discussion, the general term data module refers to MPDMs,
MTDMs, and DAs. The PBX loop or digital link between a data module and the
Digital Line port supports two logical information channels and one signaling
channel. Data modules generally use the primary information channel for data
communications and the signaling channel for dialing and call supervision. With
4-wire DCP, the secondary information channel can be used to support a second
data module on a shared port.
Besides being used for data calls between terminals, computers, and data
communications equipment, data modules also serve as interfaces to equipment
associated with system features such as System Administration, Station Message
Detailed Recording, Message Center Service, Automatic Call Distribution,
Distributed Communications System, and Audio Information Exchange.
Maintenance for data modules associated with these latter services are covered
by other MOs such as PMS-PRNT, JNL-PRNT, and PMS-LINK.
Maintenance of data modules is closely related to and interacts with Digital Line
circuit pack maintenance, and test results for data modules can be affected by the
health of the Digital Line circuit pack. Keep this interaction in mind when
investigating customer-reported problems with data modules.
Data modules provide a variety of option switches to allow the customer to select
data rates, parity, keyboard dialing, local, and remote loop back, etc. (The DAA2
Data Adaptor has an AT (Hayes) type interface that allows selection of the above
parameters as well as mode — linked or stand-alone.) An incorrect selection will
not necessarily cause errors, alarms or test failures, but it can result in service
disruption. See the installation manual provided with the data module for more
information about those options.
This discussion occasionally refers to a station's service state, which is defined as
follows:
Out-of-Service
Disconnected
In-Service
8-886 Issue 1 May 2002
The port, and thus the data module, have been removed from service.
Causes for this include busyout of the port, removal of the Digital Line
circuit pack and failure of the NPE Crosstalk test (#9).
The port is administered but the associated digital link does not
respond. An administered port is put in a disconnected state after a
system reboot or circuit pack insertion. This state persists until a
link-reset-pass message is received from firmware on the circuit pack.
When switch software receives a link-reset-pass message from the
port, the port is placed in service. If the link-reset-pass message is
missed, and an off-hook message is received while the port is in the
disconnected state, maintenance software will run an ID request test
and put the port into service upon receiving a correct response.
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