Modem types

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May 11th, 2007
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Can you please let me know what are the common modem types used these days for Leased lines, FR etc. Are there any good links that I can refer too. I want to understand the different signals and buttons available in a modem. Also how does the ISP test the link by using loops. Any good reference to understand loop ( hard, soft) will be highly appreciated. Thanks in advance.

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Wilson Samuel Fri, 05/11/2007 - 09:57
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Hi Manoj,

First of all these days its more common to have 'in built modems for T1/E1) like we get T1 CSU/DSU or MFTs hence the Router could be directly connected to the Telco cable (or drop out).

As far as the Loopback goes, generally I have used Hard Loopback in which we use either Loopback Jack (for T1/E1) or Loopback Barrel (for DS-3 Links)

Further information could be found at

Kind Regards,

Wilson Samuel

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Manoj Wadhwa Fri, 05/11/2007 - 10:19
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Dear Wilson,

Thanks for sharing your thoughts on this. Can you also give me some good reference to the modems used for links < T1/E1. Modem types such as mlln etc their functional and configuration/ testing. Thank you very much.


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