I have a Cisco 3745 voice gateway,with two dual port E1 PRI cards.On card 1 port 1 and card 2 port 1 PRI from Telco 1 are connected.On card 1 port 2 and card 2 port 2 PRI from Telco 2 are connected.
There are high increasing CRC errors, on port 2 of each of the cards,which is effecting the voice quality in VOIP environment.
It seems it is a syncronisation/clocking problem.
I can also see line cord voilation,path code voilation,errored seconds on ---sho controller outport fort port 2 output of each of the dual port cards.
I went to the Cisco site , in which it was explained that first port of each dual port card should have --clock source line primary-- and second port of same card should draw clock from the first port.
But it is not very clear.
The line has been checked from Telco and they have no problem on the Line.
Pls go through the attched attachmetn for config details.
Can somebody tell me if my config requires some modification to solve this problem.
The problem that you are experiencing with the clock slips is due to the fact that the two telcos you are connecting to have different quality (stratum) clocks. When connecting a single router with multiple telco's you have to pay very close attention to clocking.
The link below has various examples and solutions to various clocking scenarios
The easist way to resolve your clocking issue would be to move your E1's around so that both PRI's from telco one are on E1 1/0 and 1/1 and the two PRI's from the second telco are on E1 2/0 and 2/1 respectively.
Then set E1 1/0 and E1 2/0 to be clock source line primary and E1 1/1 and 2/1 to be clock source internal.
What this will do is to derive the clock from telco 1 and drive the internall PLL chip on slot 1 with the clock from telco 1. E1 1/1 will then use this clock for its communication. Since E1 1/1 is also connecting to telco 1, the clock will be the same and you will no longer have any slips.
Question: Have the phone connected and can ring out-but no sound coming from the handset - analog home phone - phone makes connection and pick up at the other end is ok. Can you help?
Question: Have the phone connected and can ring out-but no sound coming from the handset - analog home phone - phone makes connection and pick up at the other end is ok. Can you help?Answer
iPXE boot in ASR9K
This document applies to NCS5500 and ASR9000 routers and has been verified as such.
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