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The most modern and efficient of these WAN services includes ISDN
(Integrated Services Digital Network). This provides a high speed dialup
facility to allow your AccessBuilder 500 to automatically and quickly dial
remote offices, transmit your data between remote PCs just as speedily
and then disconnect the call. You incur minimum ISDN telephone charges
as calls are made only when needed. This is known as Dial on Demand.
ISDN can also be used to make voice calls using the AccessBuilder 500’s
Voice port. You can connect an ordinary telephone handset, faxes and
other similar office equipment.
The AccessBuilder 500 also has al port for connection over a permanent
leased line WAN connection, also available from your telephone carrier
organization. Leased lines are available to work at a range of speeds
which incur higher costs the higher the line speed. The benefit of
leased lines is their permanenc
e
and fixed cost. No dialling is required
but unlike ISDN you pay a fixed cost regardless of whether you transfer
little data or high volumes of data 24 hours a day.
Overall ISDN is probably the most cost effective solution for small
businesses. However, if your requirements to move data between sites
is likely to increase, the flexibility offered by the AccessBuilder 500 fitted
with both ISDN and WAN ports allows you to choose the type of
connection between sites that best meets your needs.
Typically, the AccessBuilder 500 is used to interconnect LANs running
protocols such as Transmission Control Protocol/Internet Protocol
(TCP/IP) or Novell Internetwork Packet Exchange (IPX). Offering full
LAN-to-LAN connectivity at speeds up to 64 Kilobits per second (Kbps)
on each ISDN B channel (128 Kpbs in total) and up to 2 Megabits per
second (Mbps) on the WAN port, the AccessBuilder 500 is a compact
desktop unit with unrivalled price and performance.
In the USA, some ISDN services run over 56 Kbps channels. Basic Rate
ISDN therefore offers connectivity of 112 Kbps in total.