American Telecom AM64/128A User Manual
Page 31
AM64/128A User Manual
Menu Operation - Option Menu
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(3)
O > 107 Normal
Press SELECT:
O > 107=108/1
This allows control line 107 to follow control line 108/1 independent of other factors.
(4)
O > 108/1 Normal
Press SELECT
O > 108/1 Set On
This option holds the control line 108/1 ON internally.
There are three options for the X.21bis V.35, V.36 and RS-530 interface. (1) and (2) as before and :
(3)
O > 107 Normal
Press SELECT
O > 107 Set On
This holds control line 107 ON permanently.
There is no control line 108/1 directly associated with V.35/V.36, so it is held ON internally. This means that
although it is not displayed, the option 108/1 Set On is active with V.35 or V.36 interfaces fitted.
5.6.3 G.703
This is only available with a G.703 interface fitted. This only operates at 64kbps 120ž codirectional data
rate.
5.6.4 Asynchronous Mode
This is only available with X.21bis V.28 interface fitted. For data rates of 19.2kbps, 9.6kbps, 4.8kbps and
2.4kbps, there is an option of selecting Synchronous or Asynchronous working. If one of these rates has
been selected, then further menu items will become available.
Following the control line setting options, the display will scroll to:
O > Sync Mode
Pressing SELECT changes the display to:
O > Async Mode
Async Mode then gives the user further options for setting the signalling rate, and character length.
5.6.5 Signalling Rate
The signalling rate defaults to :
O > Normal Rate
This is termed the basic signalling rate, and in normal use this is sufficient. This rate allows the
asynchronous bit rate to have a tolerance of between -2.5% and +1%. In order to increase the tolerance
range under which the BBM will
operate correctly, press SELECT, giving:
O > Extended Rate
The tolerance range will then be increased to allow the BBM to operate between, -2.5% to +2.3%.