ZyXEL Communications Prestige 681 User Manual page 21

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Investment
Protection
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Low Maintenance
Comparisons with other high-speed technologies:
Cable Modems
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With most Cable Modem systems, bandwidth is shared by a large number of clients. This means
that users may not achieve maximum transfer rates if the network is busy. The SDSL circuit is
point-to-point, which means that all bandwidth on the circuit is dedicated to a single client.
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If your company needs fast Internet access then SDSL allows you to transfer data up to 3 times
faster than with a cable modem.
ISDN
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ISDN service is considerably slower than SDSL. ISDN equipment is generally limited to 128k
plus compression, which might give you speeds of up to 512 Kbps. SDSL gives you speeds of up
2.3Mbps.
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ISDN does have the ability to travel over very large distances (across the country) while SDSL is
very distance limited.
T1
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T1 is very expensive because it requires a high speed, noise conditioned phone line. SDSL works
over a simple "copper loop" and does not require an expensive conditioned line.
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T1 delivers 1.5 Mbps in both directions over the line. SDSL delivers speeds of up to 2.3 Mbps in
both directions.
What is DSL?
Prestige 681 SDSL Router
SDSL is scalable, offering customers a flexible upgrade path. You can
adjust your SDSL router when you decide you need a higher access speed.
This is an internal procedure; no site visit is necessary.
SDSL connectivity (unlike ISDN) requires no complex manual
configuration; SDSL equipment is simply "plug and play."
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