P300H
P300 Series Modem Installation and Operating Handbook
Page 62
11,12,13...17, whereas 17-11 means send in order 17, 16, 15, ...11
NOTE
: In G.732 mode whilst TS0 can be dropped, it must always be replaced in TS0 at the distant end
(otherwise there is the possibility of frame alignment ambiguity).
The Modem hardware is capable of duplication and omission of timeslots, although the operator
interface (described above) does not allow such selections. If this is a requirement, please contact the
factory to discuss your needs.
After the timeslot selection the following prompt appears:
Dropped TS: [?]
1=Leave 2=Replace with idle code
Change, Tx/Rx, Baseband, Drop/Insert, Idle Menu
When data is `Dropped` from the bearer, there is the option to either leave the Tx data on the bearer, or
to replace it with an idle code. If the Rx data is to be inserted into the same timeslots as the as the Tx
data has been dropped from, then the Rx data will replace the Tx and it is of no consequence if it is first
replaced by Idle code or not.
ÔÛßÊÛ
The Tx data remains on the bearer, and will be accessible to downstream
equipment (unless Rx data inserted over it)
ÎÛÐÔßÝÛ
The Tx data is replaced as follows [MSB..LSB]:
G.732 Timeslots:
[01010101]
G.732 CAS in TS16:
[0101] (if CAS signalling mode active)
T1-ESF & T1-D4 Timeslots:
[10000000]
Note that in G.732 mode, TS0 is never replaced with idle code even if it is part of the Drop selection and
Idle is selected.
If the modem is set for
ÝÔÑÍÛÜ ÒÛÌÉÑÎÕ
or standard
×ÜÎ
operation the dialogue finishes here.
If the modem is set for
ÝËÍÌÑÓ ×ÜÎ
(Low rate format) then skip to the on page 65
If the Extended D/I feature is available (Standard on P300-TCM) and is set for
Ý´±-»¼ Ò»¬ д«- ÛÍÝ
,
×ÞÍ
or
ÝËÍÌÑÓ ×ÞÍ
, then the following two prompts appear depending on the PCM bearer selected.
Note that Channel Associated Signalling (CAS) & Robbed Bit Signalling (RBS) are described in
Appendix F "Signalling Systems Introduction: CCS, CAS & RBS" on page 215 if required.
For
Ùòéíî
bearer operation (with the Extended D/I feature available):
G.732 Chan Assoc Sig in TS16: [?]
1=Normal (ignore) 2=Transfer via sat o/h
Change, Tx/Rx, Baseband, Drop/Insert, CAS Menu
ÒÑÎÓßÔ
ø×ÙÒÑÎÛ÷
TS16 does not contain CAS (ie a terrestrial CAS multiframe and `abcd`
signalling nibbles for each timeslot). It is simply treated as a normal data
timeslot and may be dropped / inserted as with any other timeslot.
