Uplink test – Comtech EF Data MBT-4000B User Manual
Page 34
Multi-Band Transceiver System
Revision 0
Redundant Configuration MN/MBT4000B.IOM
4-6
Step
Procedure
14
Verify that both LEDs on MBT A are solid green.
15
Power up MBT B
16
Verify that both LEDs on MBT B are flashing green.
17
Power down MBT A.
18
This should have forced both switches to throw to MBT B.
19
Verify that both LEDs on MBT B are solid green
20
Power up MBT A.
21
Verify that both LEDs on MBT A are flashing green.
Uplink Test
22
Fault the block in slot 1 of MBT B by disconnecting the base-to-BUC cable.
23
LED 1 on MBT B should now be flashing red.
24
This should have forced the switch connected to MBT A to throw.
25
Verify that LED 1 on MBT A is solid green.
27
Clear the fault on unit 1 of MBT B by reconnecting the base-to-BUC cable.
28
Verify that LED 1 on MBT B is now flashing green.
29
Fault the block in slot one of MBT B and confirm proper switch/LED behavior.
30
If the system is being used to monitor external SSPAs to provide chain switching,
perform the following. Otherwise, continue to the “Downlink Test”.
31
Build the two cables(one per MBT/SSPA) that interface the AUX COMM 1
connector of the MBT to the amplifiers discrete control connector.
Items to note:
1. The MBT is designed to pass 485 communications directly to the
amplifier. Pins A-D are hard wired to the 485 comm. bus coming into the
MBT. If the amplifier is going to share the same 485 bus, it will need to
have its own serial comm. address.
2. Pin F of the AUX comm. connector is used to monitor the summary fault
relay of the amplifier. This line is internally pulled up and must be
grounded to clear a fault condition. MBT serial command ”EAM=11”
allows this fault to be detected and acted upon by the MBT.
3. Pin G of the AUX comm. connector provides a logic level
ONLINE/OFFLINE indication. This can be used to force an offline
amplifier to be muted. The amplifier must have a discrete mute-status
control line. This pin is set to be an output using the “EOM=1O” (letter O)
command. The logic state associated with an online/offline position can
be set using the “IOM=21” or IOM=20” command
32
Connect the cable between the amplifiers and the AUX Comm. one connectors
on the base units. Terminate the output of the amplifiers and power them up