Specifications

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
15–37
15.14.4 IBS Engineering Service Channel
Bi-directional processing of the components of the ESC channel, including the
asynchronous or synchronous EIA-232 data channel, and fault/alarm indications.
15.14.5 IBS Scrambling
Provides the synchronous scrambling/descrambling of the satellite-framed data specified
in IESS-309. Base modem scrambling/descrambling is assumed to be disabled in this
mode.
15.15 Drop and Insert (Optional with Overhead Card)
Primary Data Rates Supported
G.703 1544 kbps SD, RD, DDO, IDI
2048 kbps SD, RD, DDO, IDI
Satellite Data Rates Supported
(all have 16/15 overhead)
N x 64 kbps
N = 1-6, 8, 10, 12, 15, 16, 20, or 24 (T1)
(add 9 or 18 for T1, using special IBS superframe)
N = 1-6, 8, 10, 12, 15, 16, 20, 24, or 30 (E1_CCS)
N = 1, 2, 4, 6, 8, 12, 16, 24, 30 (E1_CAS)
Terrestrial Framing Supported G.732 / G.733, G.704
Satellite Overhead Rate 16/15 of data rate per IESS-308 Rev. 6 and IESS-309 Rev. 3, or higher
Timeslot Selection Range 1 to 24 (all T1 modes)
1 to 30 (E1_CAS and E1_CCS)
1 to 31 (E1_31TS)
Arbitrary order, non-contiguous available
Plesiochronous Buffer Sizes 7.5, 15, and 30 ms (E1_CAS)
6, 12, 24, and 30 ms (T1_S, and T1_ESF_S)
1, 2, 4, 8, 16, and 32 ms (all other modes)
Buffer Clock Reference Derived from Insert Data In (Insert Clock)
External (EIA-422)
SCT from modulator
Asynchronous Engineering Service Channel
ESC Data Interface Type EIA-232, Asynchronous
ESC Data Rate 1/2000 of primary data rate
ESC Data Circuits Supported SD, RD, DSR
Synchronous Engineering Service Channel
ESC Data Interface Type EIA-232, synchronous to primary data
ESC Data Rate 1/512 of primary data rate
ESC Data Circuits Supported SD, ST, RD, RT, DSR
Faults and Alarms
Satellite Backward Alarms 1 (per IESS-309)
Receive BWA Output Enabled onto secondary alarm