Comtech EF Data Vipersat SLM-5650A, Installation And Operation Manual

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SLM-5650A Satellite Modem
Revision 10
Front Panel Operation 7–43 MN-SLM-5650A
7.2.5 (SELECT:) Test Menu Branch
TEST: Carrier Loopback BERT
LampTest (

E)
Select the Carrier , Loopback , BERT , or LampTest submenu. Press [ENT] .
Carrier Test Modes, Loopback, and Tx BERT are not allowed when the
modem is set to Demod Only.
7.2.5.1 (TEST:) Carrier
Carrier Test Modes: Normal Tx-CW
Tx-1,0 (

E)
Use the

arrow keys to select Normal , Tx-CW , or Tx-1 , 0 then press [ENT] .
Carrier Test Mode Description
Normal
Not a test mode:
Select for standard modem operation.
TX-CW
The modulator produces a pure carrier that can be used for frequency and power
measurements.
TX 1,0
The modulator produces an offset (single upper side band suppressed) test carrier. Use this
test mode to check for quadrature error in the modulator.
7.2.5.2 (TEST:) Loopback
Loopback Test Modes: Normal IF
ℓ I/O1ℓ
(

E)
Use the

arrow keys to select Normal , IF
ℓ,
or I/O1
ℓ. Press
[ENT] .
Loopback Test Mode Description
Normal Not a test mode:
Select for standard modem operation.
IFℓ IF Loopback:
Loops the output of the modulator back to the demodulator (inside the modem) to
verify transmit and receive configurations match as well as the data inputs and
outputs.
I/01ℓ Baseband Loopback:
Loops the transmit data (after the interface) back to the receive data path
interface. This mode is useful for checking interface cabling and clocking.