Modem types

Manoj Wadhwa · ‎05-11-2007

Friends,

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.

Wilson Samuel · ‎05-11-2007

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).

http://cisco.com/en/US/products/ps5855/products_data_sheet0900aecd8028d2db.html

http://cisco.com/en/US/products/hw/routers/ps221/products_data_sheet09186a00801a9184.html

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

http://www.cisco.com/warp/public/471/hard_loopback.html

Kind Regards,

Wilson Samuel

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Manoj Wadhwa · ‎05-11-2007

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.