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Fujitsu SRS-1050 (
Page 12
Data Features
The optional data features of the SRS-1050 include the following
capabilities:
• Communication on the D channel using packet switching with
an asynchronous RS-232 terminal at speeds up to 19,200 bits
per second.
• Communication on the B-channel using circuit switching with
an asynchronous RS-232C terminal at speeds up to 38,400
bits per second.
In order to do data communications, your phone needs to have a
data terminal adapter installed. The supporting network data
features must also be assigned to the line.
Multipoint configurations
In older phone installations, most phone connections are point-to-
point. Each phone in a point-to-point configuration requires a
separate line into your building. However, many service providers
now offer multipoint configurations as a subscription option. ISDN
supports both point-to-point and multipoint operation. In a multipoint
configuration, up to eight devices (digital sets and/or terminal
adapters) can be connected to a single line. For example, your
company could connect two digital sets and two data terminal
adapters to a single line. The two digital sets could each use one B-
channel for voice communication, and the data terminal adapters
could use the D-channel for packet-switched data calls.
Multipoint operation goes on behind the scenes. The only time you
would be aware of it is if you get "blocked" from using a line. If
more than two users bid for the two B-channels at the same time,
the message B-CHANNEL BUSY appears. Talk to your System
Administrator if you get this message frequently.