P300H
P300 Series Modem Installation and Operating Handbook
Page 108
compatible with however INTELSAT might define it.
Default: four alarms in a
64 frame cycle.
IF-50/75
The IF Impedance is selected on this menu. There are no electrical changes
made when this option is changed as the IF ports are matched to both 50 and
75 operation, there is simply a slight adjustment of the internal power
calibrations & readings to maintain accurate level control & indication.
6.10.7 Change, User-Opt, Operation, TERR/SAT Menu
Terr/Sat: 1:BufferMF slip
2:Thin Route Spoof 3:X.50 AIS 4:G.732 spares
Change, User-Opt, Operation, Terr/Sat Menu
ÞËÚÚÛÎ ÓÚ
ÍÔ×Ð
For data rates of 1544 kbps and 2048 kbps where the data is framed, the buffer
is usually made to slip integer multiples of the frame length (3ms and 2ms
respectively). This option sets if the buffer capacity should automatically be
incremented to the nearest integer multiple of frame length at these specific
rates. Options are
ß¼¶«-¬ øÒ±®³¿´÷
or
ܱ²ù¬ ß¼¶«-¬
.
Default: ADJUST
ÌØ×Ò ÎÑËÌÛ
ÍÐÑÑÚ
This interestingly named option is to allow full connectivity of a PCM bearer to
be `spoofed` even if the link is connected over satellite via a `thin route` (ie less
than the full PCM bearer using Drop/Insert). If enabled the following features of
the PCM system appear transparent end to end:
AIS (all ones), Backward Alarm, CAS Backward alarm (G.732 only)
NOTE: When enabled
AIS is forced over the whole PCM bearer
, and so this
option should not be used with cascaded Drop/Insert, where AIS from the
second modem in a cascade would cause the inserted data from the first in the
cascade to be lost. Options are
Í°±±º
or
Ѻº
.
Default:
Ѻº
Èòëð ß×Í
In standard IBS operation 48 & 56kbps are X.50 `bit stuffed` up to 64kbps prior
to framing. It is not clear how AIS is intended to be transferred in these cases
and so AIS can remain at 48 or 56kbps and still be X.50 stuffed, or AIS can be
set at 64kbps. Options are
êìµ ß×Í ø²±®³¿´÷
or
ìèñëêµ ß×Í
.
Default: 64k AIS
(Normal)
Ùòéíî ÍÐßÎÛÍ
When the terrestrial data rate is 2048kbps in IBS/SMS mode, the operator can
select Normal or G.732 mode of operation (corresponding to INTELSATs
confusing definition of 2048kbps and 1920/1984kbps operation). This option
allows the spare bits of the TS0 of the terrestrial G.732 frame to be either
transparent across the link, or forced to all ones. Refer to section 7.2 "Change,
Tx/Rx, Baseband, Continuous, 2048k Menu (IBS)" on page 139 for further
information on operation in this mode. Options are
Ì®¿²-°¿®»²¬
or
Ú·¨ Ø·¹¸
.
Default:
Ú·¨ Ø·¹¸
.