Comtech EF Data SDM-2020 - Manual (Page 142)

SDM-2020 Satellite Modulator Revision 7
Data Interfaces MN/SDM2020M.IOM
11-7
11.1.3.5 T
RANSMIT
D
ATA
R
ATE
34.368 M
BPS
Parameter Requirements
Data Rate The input bit rate is 34.368 Mbps ± 20 ppm.
Line Coding The line code can be selected between HDB3 and AMI for data rate
34.368 Mbps.
Pulse Shape The pulse shape is nominally rectangular. All marks of valid signal level must
conform to the mask of ITU-T-G.703, Figure 17/G.703.
Jitter Characteristics Input Jitter: The unit tolerates input jitter levels specified in ITU-T-G.824,
Figure 3/G.823, and Table 2/G.823.
11.1.3.6 T
RANSMIT
D
ATA
R
ATE
44.736 M
BPS
Parameter Requirements
Data Rate The input bit rate is 44.736 Mbps ± 20 ppm.
Line Coding The line code can be selected between B3ZS and AMI for data rate
44.736 Mbps.
Pulse Shape The pulse shape for an isolated pulse falls within the mask of ITU-T-G.703,
Figure 14/G.703.
Jitter Characteristics Input Jitter: The unit tolerates input jitter levels specified in ITU-T-G.824, Figure
3/G.824, and Table 2/G.824.
11.1.3.7 T
RANSMIT
D
ATA
R
ATE
51.840 M
BPS
Parameter Requirements
Data Rate The input bit rate is 51.840 Mbps ± 20 ppm.
Line Coding The line code can be selected between B3ZS and AMI for data rate
51.840 Mbps.
Pulse Shape Amplitude: ± 1.75 V (± 10%)
Pulse Width: 9.64 ns ( ± 10%)
Pulse Mask: per TA-NWT-000253 (STS-1)
Jitter Characteristics Input Jitter Tolerance: The unit tolerates input jitter levels specified in
ITU-T-G.824, Table 2/G.824 scaled from those defined for 44.763 Mbps
to apply to the 51.840 Mbps.