User's Manual

Chapter 4 - Commissioning
Technical User Manual
InfiLINK XG
46
Application Acceptable error rate
TCP-based applications (web, FTP, etc.) 10
-4
Voice-over-IP 10
-5
UDP video (CCTV, IPTV, etc) 10
-6
TDM-over-IP 10
-7
..10
-9
Table 20 - Acceptable error rates for different applications
Automatic Modulation Control (AMC) can be adjusted due to customers
requirements.
“Normal” AMC strategy is enabled by default.
“Aggressive” AMC strategy has been designed to maximize the throughput
by utilizing higher-order modulation schemes and reducing SNR margins.
“Conservative” AMC strategy increases SNR margins, so that lower order
MCSs are used in order to keep error rates to the minimum.
It is recommended to use “Normal” strategy initially and adjust it based on
target and actual TBER values.
- Fine tune the Tx power in order to optimize the CINR and RSSI values;
these parameters can be monitored in real time from the Status page and
the recommendation is to keep the RSSI between -40…-60 dBm and the
CINR higher than 30 dB
- Select the most appropriate air frame period
NOTE
The system supports a number of different frame periods between 1 and 10 ms.
1 ms frame period gives the lowest latency (from 500 µs one-way), while 10 ms
frame period has lowest overheads and thus maximum throughput will be by
approximately 12% better for the same MCS. Due to overheads, 1 ms frame period
has significantly higher distance penalty compared to 10 ms: at 100 Km maximum
throughput decreases by 7% at 10 ms and by 75% at 1 ms. So air frames higher
than 2 ms allow using the link at higher distances.