Sagem SAGEM-LINK F - Protected Configurations; 1+1 Mute Hot Standby (MHSB); 1+1 Space Diversity

SAGEM-LINK F 288055571-04
Installation and Operation Manual
Page 113/142
Issue 04 : July 2005
Reproduction and communication prohibited without the written permission of Sagem Communication
- Telemetry downlink (10 MHz) which carries information returned from the ODU to the IDU
(alarms, receive signal level).
• Transmitter using two frequency conversions. Minimum frequency step is 250 kHz
• Diplexer
• Receiver using two frequency conversion
• Power supply
• Microcontroller which controls the ODU and communicates with the IDU
5.7 – Protected Configurations
Three protected configuration are available : 1+1 Mute Hot Standby, 1+1 Space Diversity, 1+1
Frequency diversity.
Protection switching detects failures on the units and route data to provide the best service.
5.7.1 – 1+1 Mute Hot Standby (MHSB)
IDU
ODU
C
O
U
P
L
E
R
Main
Standby
ODU
ODU
C
O
U
P
L
E
R
Main
Standby
ODU
Cable
Interface
Module
(Main)
IDU
Cable
Interface
Module
Standby
Cable
Interface
Module
(Main)
Cable
Interface
Module
Standby
Figure 5.6 SAGEM-LINK F 1+1 HSB Configuration
The 1+1 MHSB configuration involves the following principles :
• Main and standby units work at the same frequency, and are connected to the antenna with a
coupler (6dB, 3dB or 10dB coupling),
• When one transmitter is in traffic, the other is in mute position
• Both receivers are continuously operating
• Transmitter and receiver protection switch controls are independent. It is possible to have main
transmitter in traffic, with standby receiver operating.
• Transmitter and receiver protection switches are controlled by the local terminal only. The
remote terminal does not control local transmitter protection switch
• Transmitter and receiver protection switches can be controlled manually with the Pilot software
• Receiver switch has hitless features : when there is no failure on one receiver, there is no error
during receiver switching operation.
5.7.2 – 1+1 Space Diversity