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P300H P300 Series Modem Installation and Operating Handbook Page 62
TS identity over satellite: [?]
1=Maintain 2=Don’t care (Normal)
Change, Tx/Rx, Baseband, Drop/Insert, IDR Maint' Menu
Voice/Data mux (P1348/P1448 emulation): [?]
1=Audio 2=Audio+64k Data
Change, Tx/Rx, Baseband, Other Menu
If the Modem is in CUSTOM IDR mode (low rate format) then it is possible to maintain the Timeslot ID even
with an IDR overhead structure. Refer to the section "Timeslot identity maintenance" in Appendix F on page
208 if a refresh is required. Note that this is only offered under Custom IDR to simplify normal IDR menu
operation, but Custom IDR can be selected with all the possible custom features set to `Normal` to allow
normal IDR operation, but with timeslot ID maintenance. Note that for low rate IDR carriers (<1544kbps)
INTELSAT specify the IBS overhead structure, but the Modem can operate the IDR 96kbps overhead (and
use Drop/Insert) even down to 64kbps.
If the Modem is in CUSTOM IDR mode (low rate format) then the following prompt is displayed:
MAINTAIN The dropped/inserted timeslots will be aligned in the satellite IDR frame in order
to maintain the timeslot identity.
DON'T The dropped/inserted data will be arbitrarily placed in the satellite IDR frame and
the identity of the timeslots will not be maintained (as with normal IDR).
6.6.6 Change, Tx/Rx, Baseband, OTHER Menu
If the IDR option is fitted (standard on P300-IDR and above) then the modem can generate a 64kbps carrier
comprising just of two 32kbps ADPCM audio channels, or a 128kbps carrier comprising 64kbps data (from
the main data interface of the modem) plus two 32kbps ADPCM audio channels. These modes are
effectively an emulation of and are compatible with the popular P1348/P1448 voice/data mux card used
often in SNG applications. The choice between which mode is made on the following menu:
AUDIO A 64kbps data stream is generated from the two 32kbps ADPCM audio ports
normally used for the IDR Audio ESC function. Closed Net Plus ESC, IBS or
Custom IBS overhead is required in order to maintain the octet alignment (part of
timeslot ID maintenance) in order for this to function.
On the Tx path the clock mode is forced to internal, and on the Rx mode the clock
mode is forced to satellite (as the terrestrial interface is audio only there are no
clocking issues).
AUDIO+DATA A 128kbps data stream is generated, 64kbps from the two 32kbps ADPCM audio
ports normally used for the IDR Audio ESC function plus 64kbps from the main
data port. Closed Net Plus ESC, IBS or Custom IBS overhead is required in order
to maintain the timeslot ID and hence keep the channels separate in order for this
to function. Normal clocking selections are available.