User Guide
DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-328CO-TRK (CO Trunk)
10
CO-TRK (CO Trunk)
NOTE:
If ATMS testing is enabled, check the error log for ATMS Errors #3840 and
#3841. If the error log indicates that measurements exceeded acceptable
thresholds, and if no other trouble is found with the test trunk command,
run the ATMS test call with the test analog-testcall port UUCCSSpp full
command.
Central Office (CO) trunks are 2-wire analog lines to the CO which support both
incoming and outgoing calls. A CO trunk circuit pack provides an interface
between the 2-wire analog line from the CO and the system’s (4-wire) Time
Division Multiplex (TDM) Bus. The CO Trunk circuit packs include:
■ TN747B (United States), 8 port loop start or ground start CO, foreign
exchange (FX), or Wide Area Telecommunications (WATS) trunks.
■ TN438B (Australia), 8 port loop start.
■ TN447 (United Kingdom), 8 port ground start.
■ TN465 (multiple countries), 8 port loop start.
■ TN2138 (Italy), 8 port loop start.
■ TN2147 (multiple countries), 8 port loop start and United Kingdom Earth
Calling or Loop Calling Guarded Clearing.
LOOP START AND UK LOOP CALLING GUARDED CLEARING OPERATION
Idle State - Tip _ ground, Ring = CO Battery
A. Outgoing Call
1. PBX Off-Hook (Seize Message): Closes the Tip-Ring Loop
1. Where P is the port network number (1 for PPN and 2 or 3 for EPN); c is the carrier
designation (for example, A, B, C, D, or E); and SS is the address of the slot in the
carrier where the circuit pack is located (for example, 01, 02, ...etc.).
2. A MAJOR alarm on a trunk indicates that alarms on these trunks are not downgraded
by the set options command and that at least 75 percent of the trunks in this trunk
group are alarmed.
MO Name As
It Appears in
Alarm Log Alarm Level
Initial System
Technician
Command to Run
1
Full Name of MO
CO-TRK MAJOR
2
test port PCSSpp l CO Trunk
CO-TRK MINOR test port PCSSpp l CO Trunk
CO-TRK WARNING test port PCSSpp l CO Trunk