Question for EI/T1 experts

Answered Question
May 28th, 2008

i am connecting two site, one in london (E1 end) and the other in the state (T1 end). ISP will terminate the circuit to us via serial.

can somone recommend router model for both ends? I think the cisco 2801 will do fine.

Also what WIC card to use for both T1/E1?

I have this problem too.
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Correct Answer by Edison Ortiz about 8 years 6 months ago

Also my understanding from what edison is saying, if the ISP is handing off directly to us the T1/E1 circuits, then i should use the WIC-T1 card which is a fully managed DSU/CSU for T1. right?

That would be the VWIC2-1MFT-T1/E1 module.

Also, should i expect the provider to provide the CSU/DSU device normally?

It depends on the level of service you've signed-up for. It seems they are including the CSU/DSU as they are giving you the serial hand-off. Their CSU/DSU will have the channel configuration.

HTH,

__

Edison.

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Edison Ortiz Wed, 05/28/2008 - 07:48

If you are getting a serial hand-off from the ISP, the WIC-1T should meet your needs on both locations:

http://www.cisco.com/en/US/products/hw/modules/ps3129/products_tech_note09186a00800b0859.shtml

Note: 2800 isn't listed in that URL but it fully supports it.

Another option is getting HWIC-4T

http://www.cisco.com/en/US/prod/collateral/modules/ps5949/ps6182/prod_qas0900aecd80274424.html

HTH,

__

Edison.

francisco_1 Wed, 05/28/2008 - 08:24

so for the T1 end, i should WIC-1T (1 port high-speed serial WIC). I know this is support on the 2800 series.

What i'm not sure about is on the E1 side. Is there a card for EI circuit (WIC-1E) or does the WIC-1T works on both T1/E1 circuit?

Thanks.

jim_berlow Wed, 05/28/2008 - 08:52

Francisco,

I would ask your provider what handoff they will be giving you before you place your order. In the USA, it is possible that they may give you a T1 handoff instead of a serial handoff. It is also possible that they may give you a serial handoff or even an ethernet handoff. The point is you don't know what they will give you until you ask them...

On the router, the 2801 will probably suffice you. I personally use the 2811 instead because it gives you a network module slot that isn't available on the 2801. This gives you the capability to install a AIM module or WAAS module in the future (otherwise your talking about more expensive options).

Just my 2 cents.

Edison Ortiz Wed, 05/28/2008 - 09:21

If it's a serial hand-off, the WIC-T1 will serve for both connections. It doesn't care if the line is T1 or E1 as it only talks serial to the device terminating the connection.

If the ISP is going to hand-off a T1/E1 directly to you, then you need an internal CSU/DSU in your router.

This module should provide what you need:

http://www.cisco.com/en/US/prod/collateral/routers/ps5855/product_data_sheet0900aecd8028d2db.html

HTH,

__

Edison.

jim_berlow Wed, 05/28/2008 - 09:50

Agreed with you Edison. I was only pointing out that there is a difference between a WIC-1T and a WIC-T1. As you point out the HWICs today are configurable for either the E1 or T1.

Thanks!

Edison Ortiz Wed, 05/28/2008 - 10:12

Jim,

My post wasn't directed at you. I was replying to Francisco's 2nd query.

patrickvanham Thu, 05/29/2008 - 01:31

The WIC edison suggests is suitable. But make sure you confirm with the ISP whether the E1 is framed or unframed(G.703) as this will affect the choice of WIC.

francisco_1 Thu, 05/29/2008 - 12:06

They have confirmed it serial termination. So both T1/E1 digital circuits will terminate directly on the CSU/DSU (Provided by the provider) and from the CSU/DSU device, we will have a direct serial connection to the cisco router terminating on the WIC-1T card edison suggested. correct?

Also my understanding from what edison is saying, if the ISP is handing off directly to us the T1/E1 circuits, then i should use the WIC-T1 card which is a fully managed DSU/CSU for T1. right?

Also, should i expect the provider to provide the CSU/DSU device normally?

Correct Answer
Edison Ortiz Thu, 05/29/2008 - 12:12

Also my understanding from what edison is saying, if the ISP is handing off directly to us the T1/E1 circuits, then i should use the WIC-T1 card which is a fully managed DSU/CSU for T1. right?

That would be the VWIC2-1MFT-T1/E1 module.

Also, should i expect the provider to provide the CSU/DSU device normally?

It depends on the level of service you've signed-up for. It seems they are including the CSU/DSU as they are giving you the serial hand-off. Their CSU/DSU will have the channel configuration.

HTH,

__

Edison.

Please rate helpful posts

francisco_1 Thu, 06/05/2008 - 14:17

chaps,

The provider just came back to me asking me what IMUX we will be using in the state since we are providing IMUX. Can somone suggest any model compactable with cisco router?

Thanks.

Paolo Bevilacqua Thu, 06/05/2008 - 14:44

From you description above there is no imux involved in this circuit, possibly as often happens wit international connections, someone is not expressing properly or doesn't have knowledge on the matter.

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