I've already done the activity switch disable on all 3 sx2k systems to isolate which one is 'hosting' the problem. I've separated switchover time-frames by an hour between sites. When I come in each a.m., the faulty circuit shows frame slips toward the CPE. I can clear the problem by either reseting the CSU (Adtran) or loading the formatter I card. I've swapped formatter I with known good and rolled the CSUs.

I've attached the maintenance log showing entries from activity switch start to end, plus the scheduled DBMS check several hours later (this is a typical log from each day at the same time):

2007-OCT-17 05:06:19 MAINTENANCE B/Active *Major* PBX0101 #0052
DBMS info: DBMS CHECK completed.
00 database error(s) detected.
00 form(s) could not be accessed.


2007-OCT-17 02:43:09 MAINTENANCE B/Active *Major* PBX0101 #0051
The PROGRAMMED ACTIVITY SWITCH sequence has COMPLETED.

2007-OCT-17 02:19:26 MAINTENANCE B/Active *Major* PBX0101 #0050
The link from MC215AD Main Controller IIIE at location 01 1 02 Inactive
to MC312AB Peripheral Cont I at location 07 1 16 Active
is now OPEN.

2007-OCT-17 02:19:25 MAINTENANCE B/Active *Major* PBX0101 #0049
The link from MC215AD Main Controller IIIE at location 01 1 02 Inactive
to MC312AB Peripheral Cont I at location 07 1 16 Active
is now in SCANNING mode.

2007-OCT-17 02:17:25 MAINTENANCE B/Active *Major* PBX0101 #0048
MC215AD Main Controller IIIE at location 1 1 2
Tone Detector circuit 2 was returned to service


2007-OCT-17 02:17:24 MAINTENANCE B/Active *Major* PBX0101 #0047
The link from MC215AD Main Controller IIIE at location 01 1 07 Active
to MC215AD Main Controller IIIE at location 01 1 02 Inactive
is now OPEN.

2007-OCT-17 02:17:13 MAINTENANCE B/Active *Major* PBX0101 #0046
MC215AD Main Controller IIIE at location 1 1 2
Conference circuit 3 was returned to service


2007-OCT-17 02:17:03 MAINTENANCE B/Active *Major* PBX0101 #0045
MC215AD Main Controller IIIE at location 1 1 2
Tone Generator circuit 4 was returned to service


2007-OCT-17 02:17:02 MAINTENANCE B/Active *Major* PBX0101 #0044
The link from MC215AD Main Controller IIIE at location 01 1 02 Inactive
to MC312AB Peripheral Cont I at location 07 1 16 Active
is now OPEN.

2007-OCT-17 02:17:02 MAINTENANCE B/Active *Major* PBX0101 #0043
The link from MC215AD Main Controller IIIE at location 01 1 02 Inactive
to MC312AB Peripheral Cont I at location 07 1 16 Active
is now in SCANNING mode.

2007-OCT-17 02:15:55 MAINTENANCE B/Active *Major* PBX0101 #0042
MC270AA Universal T1 at location 02 1 03 02
Type of diagnostics : Background
Scope of report : Hybrid
Reason(s) for report:
- Signalling Medium Present

2007-OCT-17 02:15:55 MAINTENANCE B/Active *Major* PBX0101 #0041
MC270AA Universal T1 at location 02 1 03 01
Type of diagnostics : Background
Scope of report : Hybrid
Reason(s) for report:
- Signalling Medium Present

2007-OCT-17 02:15:45 MAINTENANCE B/Active *Major* PBX0101 #0040
The link from MC215AD Main Controller IIIE at location 01 1 07 Active
to MC215Ax Main Controller IIIE at location 01 1 02 Inactive
is now CLOSED.

2007-OCT-17 02:15:42 MAINTENANCE B/Active *Major* PBX0101 #0039
---------------+--------+-------+-------+-------+---------+---------+----------
|Total In| Unavailable | Alarm Threshold Percentages
Category | System | Total | % | Alarm | MINOR | MAJOR | CRITICAL
---------------+--------+-------+-------+-------+---------+---------+----------
Trunks | 146 | 23 | 15 % | Major | > 0 % | 10 % | 100 % |
Digital Links | 6 | 1 | 16 % | Major | - | > 0 % | - |
---------------+--------+-------+-------+-------+---------+---------+----------


2007-OCT-17 02:15:42 MAINTENANCE B/Active *Major* PBX0101 #0038
------------
Current System Alarm : | MAJOR | viewed from Active
------------


2007-OCT-17 02:15:23 MAINTENANCE B/Active -Info- PBX0101 #0037
MC215AD Main Controller IIIE at location 1 1 7
Tone Detector circuit 2 was returned to service


2007-OCT-17 02:15:20 MAINTENANCE B/Active -Info- PBX0101 #0036
MC263BA DS1 Formatter at location 03 1 05 01
Type of diagnostics : Background
Scope of report : Hybrid
Reason(s) for report:
- Far end alarm : Present

2007-OCT-17 02:15:20 MAINTENANCE B/Active -Info- PBX0101 #0035
MC215AD Main Controller IIIE at location 1 1 2
Tone Detector circuit 2 was returned to service


2007-OCT-17 02:15:20 MAINTENANCE B/Active -Info- PBX0101 #0034
MC312AB Peripheral Cont I at location 8 1 16
DTMF Receiver circuit 7 was returned to service


2007-OCT-17 02:15:20 MAINTENANCE B/Active -Info- PBX0101 #0033
MC312AB Peripheral Cont I at location 8 1 16
DTMF Receiver circuit 1 was returned to service


2007-OCT-17 02:15:20 MAINTENANCE B/Active -Info- PBX0101 #0032
MC312AB Peripheral Cont I at location 5 1 16
DTMF Receiver circuit 7 was returned to service


2007-OCT-17 02:15:20 MAINTENANCE B/Active -Info- PBX0101 #0031
MC312AB Peripheral Cont I at location 5 1 16
DTMF Receiver circuit 1 was returned to service


2007-OCT-17 02:15:16 MAINTENANCE B/Active -Info- PBX0101 #0030
ACTIVITY SWITCH to MC215AD Main Controller IIIE at location 01 1 07
from MC215AD Main Controller IIIE at location 01 1 02
was SUCCESSFUL.
The reason(s) for the switch attempt :
- Programmed Activity Switch

2007-OCT-17 02:15:16 MAINTENANCE B/Active -Info- PBX0101 #0029
MC215AD Main Controller IIIE at location 1 1 2
Conference circuit 3 was returned to service


2007-OCT-17 02:15:16 MAINTENANCE B/Active -Info- PBX0101 #0028
MC215AD Main Controller IIIE at location 1 1 2
Tone Generator circuit 4 was returned to service


2007-OCT-17 02:15:14 MAINTENANCE B/Active -Info- PBX0101 #0027
MC312AB Peripheral Cont I at location 4 1 16
DTMF Receiver circuit 7 was returned to service


2007-OCT-17 02:15:14 MAINTENANCE B/Active -Info- PBX0101 #0026
MC312AB Peripheral Cont I at location 4 1 16
DTMF Receiver circuit 1 was returned to service


2007-OCT-17 02:15:12 MAINTENANCE B/Active -Info- PBX0101 #0025
MC312AB Peripheral Cont I at location 7 1 16
DTMF Receiver circuit 7 was returned to service


2007-OCT-17 02:15:12 MAINTENANCE B/Active -Info- PBX0101 #0024
MC312AB Peripheral Cont I at location 7 1 16
DTMF Receiver circuit 1 was returned to service


2007-OCT-17 02:15:10 MAINTENANCE B/Active -Info- PBX0101 #0023
MC312AB Peripheral Cont I at location 06 1 16 installed

2007-OCT-17 02:15:10 MAINTENANCE B/Active -Info- PBX0101 #0022
MC312Ax Peripheral Cont I at location 06 1 16 removed

2007-OCT-17 02:15:08 MAINTENANCE B/Active -Info- PBX0101 #0021
MC215AD Main Controller IIIE at location 1 1 7
Conference circuit 3 was returned to service


2007-OCT-17 02:15:08 MAINTENANCE B/Active -Info- PBX0101 #0020
MC215AD Main Controller IIIE at location 1 1 7
Tone Generator circuit 4 was returned to service


2007-OCT-17 02:15:08 MAINTENANCE B/Active -Info- PBX0101 #0019
MC312AB Peripheral Cont I at location 6 1 16
DTMF Receiver circuit 7 was returned to service


2007-OCT-17 02:15:08 MAINTENANCE B/Active -Info- PBX0101 #0018
MC312AB Peripheral Cont I at location 6 1 16
DTMF Receiver circuit 1 was returned to service


2007-OCT-17 02:15:07 MAINTENANCE B/Active -Info- PBX0101 #0017
MC215AD Main Controller IIIE at location 1 1 7
Tone Detector circuit 2 was taken out of service
due to loss of sanity