P300H
P300 Series Modem Installation and Operating Handbook
Page 81
IBS MODE ESC & AUX PORT DEFINITIONS
6.6.27 Change, Tx/Rx, ESC/Aux/BA, DEFINE (IBS) Menu
When operating in IBS or Custom IBS modes, the Define selection is as follows:
Tx Aux Port: [?] 1=Off
2=INTELSAT low rate channel 3=Sync Channel
Change, Tx/Rx, ESC/Aux/BA, Define (IBS), Aux Menu
ÑÚÚ
The Aux port is disabled.
×ÒÌÛÔÍßÌ
The Aux port provides the `low rate ESC` definition in IESS309 (which then
refers back to IESS403). In this mode only TS32 bit 1 of the overhead is
allocated to the Aux port, which provides an oversampled async interface at a
maximum Baud rate of approx 1/2000th the main data rate. Note that even in
this mode a clock is available, and the port may be used synchronously (at
1/480th the data rate) if required.
ÍÇÒÝ ÝØßÒÒÛÔ
This option is only available if the
IDR
option is fitted (standard on P300-IDR
and above) as it requires the `Clock/Data/Octet` Aux port on the IDR option to
provide the synchronous Aux interface (the single `Data` line used for the
oversampled INTELSAT ESC on the Async ESC connector cannot provide a
synchronous interface). If selected the Aux port operates synchronously, and
varying amounts of the IBS overhead may be allocated to the sync Aux
channel. The sync channel may utilise at up to a total of 21/32nds of the
overhead which with Standard IBS/SMS this allows the Aux port to operate up
to 4.375% of the main data port rate. The selection of the overhead available to
the Aux channel is made following the next menu (which specifies the ESC
port), allowing the overhead to be allocated between the Aux port and ESC
ports.
This menu is followed by
ESC Port [?]:
1=Off 2:High Rate async channel
Change, Tx/Rx, ESC/Aux/BA Define (IBS), ESC Menu
ÑÚÚ
The ESC port is disabled
Ø×ÙØ ÎßÌÛ
ßÍÇÒÝ
The
ESC Channel
provides the `Paradise High Rate ESC`, which in a later
menu may be configured to be compatible with earlier products such as the
P230, P230D/I, and P1300/P1361 combination. This provides an async
channel with maximum Baud rate
approximately
the terrestrial rate / 23 (eg
usable rates of 2400 Baud at 64 kbps and 9600 Baud at 256 kbps). One of the
prime uses for this ESC channel is to link it to the M&C port of the Modem
(software controlled internal link), and provide remote M&C of the
distant
equipment from the
local
end of the link.
