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E1 modul problem at Cisco 3660 router

We are using Cisco 3660

router at the centre.There are fourteen cisco 1750 router that are

remote connected to the centre.Line capacity is 2048 Kbps and remote

side has 64 Kbps CIR and 64 Kbps EIR frame relay communations.

CIR(commited information rate) and EIR (Excess information rate). that

means that Turk Telekom commited half of 64 Kbps (net 32 Kbps) if line

speed 64 Kbps possible EIR will take part and 64 Kbps is running on the

line.EIR and the CIR not valid simulatiously but both of them are

defined on the central router.

Modules are the centre router (Cisco 3660) are as follows.


VWIC-1MFT-E1 this modul is connected to the telephone central (PBX)

Nortel Meridian 1 Option 11 C PBX E1 PRI.

The problem is when fifteen channel are active at the telephone central

voice communication are normal.but when request 16-17----etc. channels

we are not able to call from router.Meridian Technicians say that there

is no problem on meridian side.but also there is no wrong to the cisco

router side.We didnt find the problem.We need your advise.


Re: E1 modul problem at Cisco 3660 router

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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