WAN

My first thought is that you are talking about Asymmetric Digital Subscriber Lines, (ADSL) and Symmetric Digital Subscriber Lines, (SDSL). If that is so, the difference is this...ADSL allows faster data transfer speeds in one direction, while SDSL transmits in both directions at the same speed. For example, with ADSL, a typical user will receive data at 256 Kbps, but will be limited on their transmit rate to 64 Kbps. An SDSL user would both transmit and receive at 256 Kbps (or whatever speedthey purchased). Hope this helps.
- ck

Symmetric links are those with equal upload and download speeds. Typical examples would be commercial data circuits (leased-line, frame relay, T-1, ATM, etc.).

Asymmetric links would be those with different upload and download speeds and are usually found on residential (non-commercial systems). Typical examples would be 56k v.90 analog modems, ADSL, many satellite systems, and some cable modem systems.

paul

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