Sagem SAGEM-LINK F - Appendix 3 - Miscellaneous; Changing 8 Ghz ODU T;R Spacing Procedure

SAGEM-LINK F 288055571-04
Installation and Operation Manual
Page 136/142
Issue 04 : July 2005
Reproduction and communication prohibited without the written permission of Sagem Communication
Appendix 3
Miscellaneous
Changing 8 GHz ODU T/R Spacing Procedure
The 8 GHz UIT-R F.386-6 Annex3 Recommendation indicates that transmit to receive spacing depends
on the radio link capacity.
• For 34 Mbit/s or equivalent capacities (16x2 Mbit/s), this T/R spacing is equal to 119 MHz.
• For other capacities, the T/R spacing must be equal to 126 MHz.
SAGEM-LINK F 8 GHz radios working with this frequency plan, use diplexers designed to work with this
particular frequency plan. An ODU can transmit one 28 MHz channel with 119 MHz T/R spacing or two 14
MHz channels with 128 MHz T/R spacing.
The following diagram indicates how the different channels are managed.
F0 LB filter F0 HB Filter
Fminfl
Fmaxfl Fminfh
Fmaxfh
119 MHz
16xE1 channel : Bw = 28 MHz
8xE1 channel B
8xE1 channel A : Bw = 14 MHz
126 MHz
126 MHz
7 MHz
Diplexer useful bandwidth
4xE1 channels : Bw = 7 MHz
2xE1 channels : Bw = 3.5 MHz
14 MHz