Technical data

J-4 ISDN Service Providers and Manufacturers 90362-01
You will also need to tell the local telephone company who your long
distance carrier is.
Long Distance Service Requirements
When you subscribe for long distance service you should request
circuit-switched 64kbps (kilobytes per second) clear channel access, if
possible.
If you are going to be making long distance ISDN calls, it is very likely that
your call will be routed through some older phone equipment and the band-
width reduced to 56kbps per B channel.The NetBlazer default mode of
operation is to use 56kbps service for each call.
ISDN Manufacturers
In North America, you have to buy and maintain your own NT1 device for
ISDN. You will need to buy a power supply with the NT1.
TEI Dynamic
Bearer Service Circuit Switched Data Permitted on
any B channel (Packet-mode data not
permitted)
Note:
To change the default speed for ISDN calls, you need to change the speed
of the line. See Chapter 5, “Line Setup” for more information. You may also
need to change the default call speed; see the NetBlazer Command
Reference Manual for information on changing the ISDN call speed.
Note that many telephone lines are limited to 56kbps, so you should not
change the line or call speeds unless you know that all lines you will be us-
ing can transmit at that speed, and that the NetBlazer or TA at the other end
of the connection can receive at a different speed.