Could You print the reference clock status from both systems, I have a similar setup (plus 2 Op11)
at the small system LD 60 ssck 0 0, at the large system LD60 ssck 0.
A while a go the link stopped working, got me running around until y switched the ref clock in the small system to free run and it worked, next day I returned it to track the PRI card, it worked fine since.
EXAMPLE:
CS1K-M
.SSCK 0
ENBL
CLOCK ACTIVE
GROUP 0
SIDE 0
CLOCK CONTROLLER - TRACK ON LOOP 50
PREF - 50 ****PRIMARY REFERENCE
SREF - 14 ****SECONDARY REFERENCE
AUTO SWREF CLK - ENBL
NO ERROR
---------------
CS1K-E
.SSCK 0 0
ENBL
CLOCK ACTIVE
CLOCK CONTROLLER - LOCKED TO SLOT 2
PREF - 2
SREF -
AUTO SWREF CLK - ENBL