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Clock Source Problem ( POS interface - 7609 OSR )

Can any one Please asssit :

I've got a POS link on a 7609 Flexwan Module connecting via a Sonet Network connecting to a 12410 GSR.

Problem is: i have configured both ends to clock from Line but the OSR keeps reverting back to internal.

with the show controller command , it indicates a change back to internal , Reason S1.

Has anyone had this problem before ? any suggestion ?

Find below output of Show controller:

SHOSR01#sh controllers pos 7/0/0 details

POS7/0/0

SECTION

LOF = 1 LOS = 1 BIP(B1) = 4843

LINE

AIS = 1 RDI = 1 FEBE = 6321445 BIP(B2) = 2105609

PATH

AIS = 22 RDI = 22 FEBE = 193111 BIP(B3) = 206445

PLM = 5 UNEQ = 10 TIM = 0 TIU = 0

LOP = 0 NEWPTR = 699 PSE = 4053218 NSE = 21

Active Defects: None

Active Alarms: None

Alarm reporting enabled for: SF SLOS SLOF B1-TCA LAIS LRDI B2-TCA PAIS PLOP PRDI B3-TCA

Line alarm trigger delay = 100 ms

Path alarm trigger delay = 100 ms

Framing: SONET

APS

COAPS = 6 PSBF = 1

State: PSBF_state = False

Rx(K1/K2): 00/00 Tx(K1/K2): 00/00

Rx Synchronization Status S1 = 0F

S1S0 = 02, C2 = CF

Remote aps status (none); Reflected local aps status (none)

CLOCK RECOVERY

RDOOL = 0

State: RDOOL_state = False

PATH TRACE BUFFER: STABLE

Remote hostname : ESGSR01

Remote interface: POS1/0

Remote IP addr : 10.136.24.13

Remote Rx(K1/K2): F9/FF Tx(K1/K2): 08/00

50CE4880: 45534753 52303100 00000000 ESGSR01.....

50CE4890: 00000000 00000000 00000000 504F5331 ............POS1

50CE48A0: 2F300000 00000000 00003130 2E313336 /0........10.136

50CE48B0: 2E32342E 31330000 00004639 46463038 .24.13....F9FF08

50CE48C0: 30300D0A 00..

BER thresholds: SF = 10e-3 SD = 10e-6

TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6

Clock source: internal

Clock source changed to : internal Reason : S1

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