T1 Card for data on Cisco 3945 and Cisco 7206

[Subin Kallidumpil]

Hi Team,

I am working on a case where T1 card is required for Cisco 3945 and Cisco 7206 Router.

For Cisco 3945 we have variety of cards available i.e.

HWIC-4T      (Clear channel)

HWIC-1CE1T1-PRI (Channelized T1\E1)

Which one should i go for and what is the difference between clear channel and channelized ports

For Cisco 7206

PA-MC-8TE1+ , seems only this one is available.

Would requuire your inputs on the same.

Thanks and Regards

K Subin

[Subin Kallidumpil]

I would like to add one more query to the above one

i.e. if we could configure  interface of HWIC-1CE1T1-PRI  and  PA-MC-8TE1+  as clear channel interface. i.e. i would not like to create any channels and terminate a raw bandwidth of 1.54 Mbps

[Jose Bogantes · Accepted solution]

Hello Subin,

The problem that I find with the HWIC-4T is that this is not a real T1 card. Its synchronous maximum speed is 8 Mbps and you will need an external DSU, which will provide clocking and determine the speed of the link. On the other hand, HWIC-1CE1T1-PRI is basically an ISDN PRI card but it can be also used as a T1/E1 card for data. Check this configuration guide and look for the options you have with this card:

http://www.cisco.com/en/US/docs/ios/12_4/12_4x/12_4_11xw/fmt1e1ic.html

PA-MC-8TE1 is also a versatile card that has T1/E1 functions so you will need to use the "card type" command to determine if the card would be a T1 or an E1.

http://www.cisco.com/en/US/docs/interfaces_modules/port_adapters/install_upgrade/multichannel_serial/8-port_multichannel_t1.ei_8pri_install_config/2738cfg.html

The configuration for both cards to get a T1 circuit is pretty similar because you need to configure "card type", controllers and their respective channel-groups and timeslots to get the proper number of DS0s to obtain a T1 (For a full T1 is always timeslots 1-24). Moreover, avoid using "network-clock-participate" and "network-clock-select" commands for they are voice/ISDN commands that could trigger clocking issues in a normal data circuit. The clock source command is important and is configured under the controller T1. When the Telco provides clocking in the middle, you can keep "clock source line" on both ends but if the circuit is back-to-back, it is recommended to use "clock source line" in router A and "clock source internal" in router B. In summary, I think the cirucit will come up if you use PA-MC-8TE1/HWIC-1CE1T1-PRI in the circuit as long as you use the proper clocking, timeslots, framing and line coding for a T1.

Regards.

[Subin Kallidumpil]

Hi Jose,

Thanks a lot, this gave me a lot of clear picture.

Actually it was a typo error from my side for HWIC-4T, what i actually meant was HWIC-4T1\E1 (Which is a 4 port clear channel card).

I had a word with my customer and he wants a clear channel card for T1 (Data).

Now For Cisco 3945, HWIC-4T1\E1 will do but for Cisco 7206 can you suggest me a card which supports clear channel.

As per my understanding for clear channel we never create those 24 x DS0 channels (T1), its a single raw channel of 1.53 Mbps. Please correct me if i am wrong.

Also if you could confirm whether  HWIC-1CE1T1-PRI supports clear channel.

.

Regards

K Subin

[Subin Kallidumpil]

Hi Team,

Still waiting for an reply !!!!!!!!!!!!

[Jose Bogantes · Accepted solution]

Hello Subin,

The information I provided about the configuration is just Ok. I guess you are mixing E1 and T1 concepts here for there is no clear channel T1. This applies just to E1 circuits. Your customer is probably talking about a full T1 instead of a fractional one. As I mentioned earlier, 1-24 timeslots equal a full T1; on the other hand, if you are configuring an E1, you can configure a channelized E1 by using timeslots 1-31 (1984kbps). This happens for one DS0 is reserved for G704 framing because 32 timeslots can be indeed used. Then you have the G703 option, which allows you to use all the 32 timeslots for data (2048kbps). This is known as unstructured, unchannelized or clear channel E1.

For a T1, configuring timeslots is indeed necessary without mattering if this is a full T1 or a channelized one. Otherwise, the interface serial will never appear. This affirmation can only be used when the configuration includes a controller T1. It does not apply to cards using the service-module command (WIC-1DSU-T1, WIC-1DSU-T1-V2 or HWIC-1DSU-T1)

Finally, I would like to mention that all those cards mentioned in this discussion support clear channel but just for E1s:

• HWIC-1CE1T1-PRI: The modules support balanced and unbalanced E1 connectivity and conform to the G.703 and G.704 standards for unframed and framed E1 modes.

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/product_data_sheet0900aecd80710c88_ps5949_Products_Data_Sheet.html

• PA-MC-8TE1+: The PA-MC-8TE1+ interfaces can be channelized, fractional, or unframed (E1 only).

http://www.cisco.com/en/US/docs/interfaces_modules/port_adapters/install_upgrade/multichannel_serial/8-port_multichannel_t1.ei_8pri_install_config/2738ovr.html

• HWIC-4T1/E1: The modules support balanced and unbalanced E1 connectivity and conform to G.703 and G.704 standards for unframed and framed E1 modes.

http://www.cisco.com/en/US/prod/collateral/modules/ps5949/product_data_sheet0900aecd80710c77.html

Regards,

[Subin Kallidumpil]

Thanks a lot jose. The information provided was extremely usefull.

Now i have my concepts clear on the T1/E1.

Regards

K Subin

[Jose Bogantes · Accepted solution]

Hello Subin,

It is great to know that  the information was useful for you. Please mark the discussion as answered if you do not have any other question.

Cheers.