three ID's to be set (0-255 for each), and also displays the corresponding ID's

 

from the incoming Rx carrier. Default: all 255

BACK ALM

 

 

 

MAP

In Custom IBS Modes it is possible to operate an IBS style service, and allow the

 

use of four independent backward alarms (as for IDR) for use on

 

multidestinational services. This option allows the four alarms to be mapped in

 

different ways onto the IBS TS32 multiframe, in the hope that should INTELSAT

 

adopt such a standard, the P300 Modems could be set to be 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

BUFFER MF

 

 

 

SLIP

For data rates of 1544 kbps and 2048 kbps where the data is framed, the buffer

THIN ROUTES

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 Adjust (Normal) or Don't Adjust. Default: ADJUST

This interestingly named option is to allow full connectivity of a PCM bearerSto be

SPOOF

 

`spoofed`S

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 Spoof or Off. Default: Off

X.50 AIS

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 64k AIS (normal) or 48/56k AIS. Default: 64k AIS (Normal)

G.732 SPARES

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 7.2.1 "Change, Tx/Rx, Baseband, Continuous, 2048k Menu (IBS)" on page 137 for further information on operation in this mode. Options are Transparent or Fix High. Default: Fix High.

P300H

P300 Series Modem Installation and Operating Handbook

Page 105

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Image 105
Paradise P300 specifications Back ALM MAP, Change, User-Opt, Operation, TERR/SAT Menu, Buffer MF Slip, Spoof