DS-1 configuration 2-9
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Table 2-4
DMS-250 switch settings
Distance to cross-connect
Switches closed
0 to 298 ft (0 to 101.6 m) SW1
298 to 449 ft (101.6 m to 153.0 m) SW2, SW5, SW7
449 to 656 ft (153.0 m to 223.6 m) SW3, SW6, SW8
Note:
SW4 is not used.
—end—
Test equipment requirements
The following describes useful equipment for commissioning a DS-1 trunk.
DS-1 line simulator
A DS-1 line simulator/monitor can be used to verify the integrity of the
DS-1 trunks between a DMS-250 switch and a PBX. The line simulator can
perform the following tasks:
• monitor a single path without being part of the primary path
• be included in the path between the two systems and operate in either a
transparent mode or provide its own stimulus to the trunk
• monitor the status of the trunk
• monitor the information in the channels
• simulate information in a given channel or an idle code in all channels
• simulate the alarms
Error counter
An error counter detects BPVs or no-signal periods for DS-1 trunks. The
fault detection and isolation procedures are performed using a Thor portable
test package. This test package consists of one of each of the following
items:
• Thor TTT2028 Mini Error Counter with an operation instruction card
• test cable equipped with a bantam plug at one end and minihooks at the
other end
• loopback plug with pin 3 shorted to pin 1 and pin 11 shorted to pin 9 (of
a 15-pin D-connector)
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