DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-650DS1-FAC (DS1 Facility)
9
3. If the CPE side LOS indication on CSU B is on (active), check for a
problem between the CPE side of CSU B and the DS1 CONV B
circuit pack. Connectors, cables, and the CSU B may need to be
replaced.
4. If the CSU A and the CSU B do not provide visual CPE side and
DS1 facility side LOS indications, follow the repair procedure that is
given for error type #1025 (Loss of Frame Alignment). Apply the
procedure first to the DS1 CONV B side instead of the DS1 CONV A
where the error is reported (external loopback test is not expected
to pass if we execute it at this end as long as we have the LOS
indication).
Repair procedure for error type #1025 (Loss of Frame Alignment)
includes execution of Near-end External Loopback test #799. If the
system is not configured as a Critical Reliability System and if there
is only one DS1 facility, then the test #799 can only be executed at
the end which is closer to the SPE relative to the DS1 CONV circuit
pack at the end of the DS1 CONV Complex. If the test cannot be
executed for that reason, then still make the external loopback as if
the test was going to be executed, but instead of executing the test,
check the green LED at the face plate of the DS1 CONV B that is
associated with this DS1 facility. If the green LED is off, then replace
the connectors, cables, and the CSU B.
5. If the problem still persists, replace the DS1 CONV circuit pack at
the other end of the DS1 CONV Complex.
6. If the problem still persists, replace this DS1 CONV circuit pack.
If D4 framing is used, an in-band alarm signal (RFA) is transmitted that
corrupts transmit data in response to this alarm.
j. More than 17 misframe errors occurred. This error will clear when there are
no misframes for 1 hour.
1. Enter
display errors
and follow the associated repair procedures
for any SYNC, TDM-CLK, or SNC-BD errors.
2. Verify that the DS1 facility and the network are using the same Line
Coding. For TN574 boards and TN1654 boards in T1 mode, also
verify that the Framing Mode used is the same. Use
list fibers
and
display fiber-link commands to check the values for this DS1
facility. Contact T1 Network Service to check the modes used by
1. ;DS1 facility may be a private line or it may be connected to the Network. Network
Interface (NI) point is where the customer’s maintenance responsibility ends and the DS1
facility vendor’s maintenance responsibility begins. This point ideally is the T, R, T1, and
R1 terminals on the rear of the CSU to which the wires of the DS1 facility vendor’s DS1
facility is attached. If the NI does not occur at this point, then any cabling between the
CSU terminals and the NI is also considered to be part of the CPE. This cable typically
runs between the DS1 facility terminals of the CSU and a cross-connect field where the
DS1 facility vendor has terminated the DS1 facility. Maintenance responsibility for this
portion of the DS1 facility resides with the customer unless other arrangements are made.
