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P300H P300 Series Modem Installation and Operating Handbook Page 76
ESC/Aux: 1:Define 2:Async ESC
3:Interfaces 4:Audio levels 5:Back’ alm
Change, Tx/Rx, ESC/Aux/BA Menu (IBS/SMS/IDR)
ESC Channel (overhead is 2.39%):
1:Async[2400,8,N] 2:Interface[RS485] 3:Audio
Change, Tx/Rx, ESC/Aux Menu (Closed Net Plus ESC)
6.6.25 Change, Tx/Rx, ESC/AUX/BA Menu
This dialogue is not available when the service is set at Normal Closed Network, and differs between
Closed Net Plus ESC, IBS/SMS and IDR services. The IBS/SMS and IDR menu appears below, but some
options may not be displayed depending on how the modem Service is defined:
In Closed Net Plus ESC mode a slightly different screen is displayed including the overhead percentage
required to support the ESC rate as set:
DEFINE Enable & Disable the ESC & Aux ports, specify the port usage (eg IDR sync or
async ESC), and allocate different parts of the overhead to each port. In Closed
Net Plus ESC the ESC channel is already defined to use as much of the overhead
as possible and the Aux channel is not available so the Define option is not
required (and is not offered).
ASYNC ESC When the ESC port is set for async operation this selection configures the async
character format and Baud rate.
INTERFACES Set the electrical interfaces for each port, for the ESC port control if it is directly
internally linked to the M&C port for distant end M&C
AUDIO LEVELS Set the levels or the Audio port, both in when used for IDR ESC and when used
directly to generate a 64kbps carrier (2 x Audio only) or 128 kbps carrier (2 x
Audio + 64k data)
BACK' ALM Configure the four Tx backward alarms to map to the external input ports, or be
directly connected to the Rx fault status of this modem (saves external patching
in non-multidestinational carriers). This option is on the Tx menu only and again
is not shown in Closed Net Plus ESC mode.