Automatic Line Testing; Station Testing; Manual Line Testing - Nortel DMS-100 Series Maintenance Manual

Automatic line testing

Automatic line tests (ALT) are performed on line circuits and loops, usually on
a scheduled basis, without switch operator involvement other than for initial
scheduling. Automatic line tests are also performed when a line shows a fault.
The ALT subsystem commands are discussed in the "Star Remote System user
interface commands" chapter in this manual.

Station testing

Station testing is performed either under the LNS subsystem at a MAP
terminal or, for the silent switchman (SSMAN) and station ringer (SR) tests,
from a station. Stations are tested manually.
Station test results are displayed at the video display unit (VDU), except for
the station ringer and silent switchman tests. The results of these tests are
returned to the station.
Station testing helps determine if a station is functioning properly while
connected to a loop and line circuit combination.

Manual line testing

Manual line tests are performed by the switch operator on line circuits, loops,
and stations. Line circuits and loops are tested individually. The results of the
test are displayed to the switch operator, immediately after testing, at a video
display unit (VDU).
Lines are tested manually as part of routine maintenance, when a customer
report is generated or when an ALT failure occurs. Manual line testing is
performed at the LTP level using any of the following levels of the LNS
subsystem:
• ALT
• LTP
• LTP manual (LTPMAN)
• LTP line test access (LTPLTA)
• LTP data (LTPDATA)
• LTP ISDN (LTPISDN)
Manual line testing at the ALT level defines one line to be tested immediately.
At the other levels, manual testing is performed by placing the line to be acted
upon in the control position. The switch operator controls this line, which may
be manipulated. A line must be posted first before being placed in the control
position.
Star Remote System manual maintenance 7-23
DMS-100 Family NA100 Star Remote System XPM15 and up