T1 config: service-module t1 clock source internal

lwwarnerlwwarner Member Posts: 147 ■■■□□□□□□□
In another thread about T1 cabling, Mike said:
mikej412 wrote: »
... and don't forget the service-module t1 clock source internal on one side of the connection
Is this command really needed? My T1 crossover connection comes up just fine without it. Both sides are up & up, they both show "Framing is ESF, Line Code is B8ZS, Current clock source is line," and "Hardware is PowerQUICC MPC860 with Integrated FT1 CSU/DSU module TX and RX clocks detected."

Both sides are 2651XM/WIC-2T/WIC-1DSU-T1 boxes running Cisco IOS Software, C2600 Software (C2600-ADVENTERPRISEK9-M), Version 12.4(23), RELEASE SOFTWARE (fc1).



  • tierstentiersten Member Posts: 4,505
    Yes. It is needed. It will come up but it is unreliable because it isn't synchronised. It won't operate correctly if one end isn't providing a clock. Try sending data over that link and look at the counters for errors.
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