ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 18)

1. System Introduction
MSAP2000 Technical Manual V3.0 1-7
1.5. Testing and maintenance
MSAP2000 is equipped with testing ability for system diagnostic
and can add testing, MLTM, to execute subscriber’s loop quality
examination. Built-in order-wire provides easy front access at
main shelf for maintenance engineers to communicate when
mobile signal is denied or battery is dried.
Testing
MSAP2000 supports analog test with MLTM modules. There are
three stages for these analog test items: stage I, stage II, and
stage III. Below is an illustration that describes how to divide the
whole signal path into these three stages.
Stage I starts from COT backplane connection and ends with
switch interface.
Stage II starts from the analog module at COT and ends with the
corresponding one at RT.
Stage III starts from RT backplane connection and ends with the
customer premise equipment (CPE).
Note that the end connection at both stage I and stage III can be
altered in order to determine which section of the loop is having a
problem.
All testing can be executed, and test result, diagnostic,
conclusion, suggestion, alarm can be displayed in both LCT/UI or
in NMS
Digital line testing
Digital modules are all built-in with testing function such as local
loopback, remote loop back, line loopback, inward loopback,
payload loopback, facility loopback, terminal loopback. Testing
function can be executed in LCT or in NMS.
Order wire
Located at the right bottom of each shelf, the RJ-11 connector on
the main shelf provides point-to-point voice channel among the
COT & RTs. Each node has its own four-digit number for other
node to call in. Build-in ring generator allows the engineer at
the other side to attend to task at hand rather than waiting to see
LED status in deciding if there’s any in-coming call by order wire.