Avaya Definity SI, Maintenance Manual, Page: 1984 / 2968

Maintenance Object Repair Procedures
555-233-123 10-1198 Issue 4 May 2002
Data Module Internal Loop Around Test (#175)
This test verifies that a data message can be sent from the PBX, through the
building wiring, through an internal looparound path in the data module under test,
and back to the PBX.
Figure 10-79 shows the hardware configuration used for this
test.
Figure 10-79. Internal Loop Around Test
A signaling message is sent through the digital port circuit pack to the data
module under test to request it to enter loop around mode. A test pattern is then
sent from the SPE through the Network Control circuit pack (Netcon), over the
TDM Bus, through the digital port circuit pack, to the data module where the
message is looped around, and sent back through the digital port circuit pack, the
TDM Bus, the Network Control circuit pack, and to the SPE where it is checked for
consistency.
This test aborts if no terminal or communications equipment is connected to the
data module. It also aborts if a number of local PBX resources are not available.
These resources include a network control channel from the Network Control
circuit pack (there are a maximum of four channels administered as Netcon-type
data modules), two TDM time slots (one for each direction of the loop around
message), and an idle digital port circuit associated with the data module under
test. Failure to allocate any of these resources causes the test to abort with a
specific error code for that resource.
A “yes/no” parameter on each data module (MPDM, MTDM, or stand-alone DA
only) administration form is required to specify if the Data Module remote Loop
Around Test is supported by the data module endpoint. If the parameter is “n” (no),
the test does not run.
NETCON
circuit pack
TDM
bus
Switch
Data module
(MPDM or MTDM)
Data
equipment
Digital
line
circuit
pack
r11j1p2 LJK 072501