Comtech EF Data SDM-2020 - Manual (Page 211)

SDM-2020 Satellite Demodulator Revision 4
Remote Control Commands MN/SDM2020D.IOM
A–11
29
30
31
32
33
34
thru
40
26
thru
40
Buffer Clock Source
(ref. ‘ICFT_’ command).
RX Interface Coding Format
(ref. ‘ICFR_’ command).
Interface Buffer Size
(ref. ‘IBS_’command).
Interface Loopback
(ref. ‘ILB_’command).
G.703 Framing Structure
(ref. ‘IRFS_’command).
Reserved.
ECL_HSSI Interface
Reserved.
The TX coding format options are limited by the
programmed TX Terrestrial clock frequency (p27):
1544 or 6312 Mbps
0 = AMI or 1 = B8ZS
2048, 8448, or 34368 Mbps 0 = AMI or 1 = HDB3
44736 or 51840 Mbps
0 = AMI or 1 = B3ZS
32064 Mbps 0 = AMI (Only option)
p29 = n, where ‘n’ is :
‘0’ = RX (Satellite)
‘1’ = (TX Terrestrial)
’2’ = Internal ‘3’ = EXT Clock
p30 = n, where ‘n’ is ‘0’ or ‘1’:
The RX coding format options are limited by the
programmed RX data rate (p1):
1544 or 6312 Mbps
0 = AMI or 1 = B8ZS
2048, 8448, or 34368 Mbps 0 = AMI or 1 = HDB3
44736 or 51840 Mbps
0 = AMI or 1 = B3ZS
32064 Mbps 0 = AMI (Only option)
p31 = nnnnnn, buffer size in mille seconds.
Note: If the RX data rate (p1) is 1.544 Mbps then the
buffer size range is 0 through 30 ms and the buffer size
is evenly divisible by 6. If the RX data rate (p1) is NOT
1.544 Mbps then the buffer size range is 0 through 32 ms
and the buffer size must be evenly divisible by 2.
p32 = n, where ‘n’ is ‘0’ (Off) or ‘1’ (On)
p33 = n, where ‘n’ is:
‘0’ = NONE
‘1’ = G.704
‘2’ = G.742 ‘3’ = G.743
‘4’ = G.745 ‘5’ = G.747
‘6’ = G.751 ‘7’ = G.752
‘8’ = G.753 ‘9’ = STS-1
Note: Data Rates and allowable Framing Structure:
1.544 Mbps =
NONE, G.704
2.048 Mbps = NONE, G.704
6.312 Mbps = NONE, G.704, G.742, G.745
8.448 Mbps = NONE, G.704, G.742, G.745
32.064 Mbps = NONE, G.752
34.368 Mbps = NONE, G.751, G.753
44.736 Mbps = NONE, G.752
51.840 Mbps = NONE, STS-1