Comtech EF Data SLM-5650C CyberLynx, Installation And Operation Manual

Page: 29 / 168

SLM-5650C / SLM-5650C-ODU Satellite Modem
Revision 1
Introduction 1–11 MN-SLM-5650C
1.5 Performance
1.5.1 Acquisition and Timing Performance Requirements
The following reference Energy per Bit to the Spectral Noise Density (Eb/No) is defined as the
required Eb/No corresponding to a BER of 1 x 10
-3 with Reed-Solomon FEC not enabled.
Table 1-6. Acquisition and Timing Performance Requirements
Parameter Specification
Initial Acquisition
The modem achieves initial acquisition within the times as specified within
±
30 kHz at
the reference Eb/No
.
• For baseband data rates between 64 kbps and ≤ 128 kbps, the maximum initial
acquisition time is 500 seconds.
•
For baseband data rates between 128kbps and
≤
1544 kbps, the maximum initial
acquisition time is 30 seconds.
•
For baseband data rates > 1544 kbps, the maximum initial acquisition time is 1.5
seconds.
Reacquisition Reacquisition is achieved, as follows, after a period of up to 15 minutes of the absence
of signal when the carrier returns to within 500 Hz of its original frequency.
•
For baseband data rates between 64 kbps and 128 kbps, the maximum
reacquisition time shall be 45 seconds.
• For baseband data rates between 128 kbps and 1544 kbps, the maximum
reacquisition time shall be 20 seconds.
•
For baseband data rates greater than 1544 kbps, the maximum reacquisition time
shall be 1 second.
System Retention Synchronization and BCI are maintained for all Eb/No above the reference Eb/No
(BPSK/QPSK/OQPSK/8PSK) for signal loss of up to 50 modulation symbol periods, with
a probability of at least 90 percent.
Receive Timing Jitter
The Rx output clock peak timing jitter cannot exceed
±
5 percent at the reference Eb/No
when the modulated signal meets the modulation timing jitter requirement.
Doppler The modem meets the requirements with a Doppler shift, rate of change, and
acceleration for satellite inclination up to ± 7
°
, as presented in Table 1-7, and an
additional 0.5 dB added to the reference Eb/No.