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NM-HDV2-2T1/E1 Clocking - CRC Errors

We have a NM-HDV2-2T1/E1 in a 2821 router. We have PRI's from a provider connected to both interfaces. We're seeing a few CRC errors on both interfaces. Currently, we have "no network-clock-participate" with both interfaces set to clock source line. We are planning to set the card to "network-clock-participate" and then "network-clock-select" on the first T1 interface. Then, setting the first T1 interface to clock source line and the second to clock source internal. Is this correct?

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: NM-HDV2-2T1/E1 Clocking - CRC Errors

Leave default of clock source line for both interfaces. Set network-clock-select with a decreasing priority of your choice.

Note, you don't need the NM-HDV2 in a 2821. You can host the PVDM2 directly on motherboard, and the VWIC in the slots.

3 REPLIES
Hall of Fame Super Gold

Re: NM-HDV2-2T1/E1 Clocking - CRC Errors

Leave default of clock source line for both interfaces. Set network-clock-select with a decreasing priority of your choice.

Note, you don't need the NM-HDV2 in a 2821. You can host the PVDM2 directly on motherboard, and the VWIC in the slots.

New Member

Re: NM-HDV2-2T1/E1 Clocking - CRC Errors

Great, thanks. Turns out we had spare NM-HDV2-2T1/E1's but no VWIC's. I made the change and will keep an eye on the interface errors. I'll mark this one as solved.

Hall of Fame Super Gold

Re: NM-HDV2-2T1/E1 Clocking - CRC Errors

You should be able to reclaim the VWIC from the NM simply pulling it out.

Thanks for the nice rating and good luck!

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