User manual

KBU 64
User Manual
80-10100000-094–12
The factory default CHAR setting is 10 bits. When a channel is set for
synchronous operation the CHAR parameter setting is ignored.
4.8.4 Altering the Network Type - NETWORK Parameter
The KBU 64 can make switched 56K data calls to the USA, either to
another KBU 64, a Fivemere 6421 or another manufacturer's TA on a
'per channel basis'.
1> NETWORK[CR]
displays the current setting of this parameter for channel 1 (read Channel
2 by typing 2>).
1> SET NETWORK SWITCH56[CR]
sets the rate adaption framing to 7 bits, the eighth bit being set to a ‘1’
(i.e. unused) for the 7 bit frame of the switched 56K networks utilised in
the USA.
With this setting the only speed that can be supported is 56Kbit/s. The
SPEED parameter must be set to 56Kbit/s on the channel concerned for
correct operation. No other setting of the SPEED parameter is valid. It is
not possible to pass control signal handling at 56Kbit/s to the USA due to
there being no free bandwidth available.
This setting also affects the talkwire protocol as it also has to operate
using a 7 bit framed octet. Only another KBU that has the same
parameter set will be able to operate with talkwire control to a KBU 64
set this way.
Note that it is not necessary to change the SPEED parameter of another
KBU 64 if only a Talkwire call is being made.
1> SET NETWORK ISDN[CR]
sets normal 8 bit rate adaption framing for 64K ISDN type networks as
used in the UK and Europe.
The default setting is ISDN. If you are in doubt about use of this
parameter, please contact your Technical Support for further
information.