Comtech EF Data CDM-710G, Installation And Operation Manual

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CDM-710G High-Speed Satellite Modem Revision 1
Front Panel Operation MN-CDM710G
6–26
If Intfc1 Port1 Rx Buffer: Æ Clk is selected:
Intfc1 Port1 Rx Clk:
Rx-Sat Tx-Terr Ext-Clk
This selection determines which source clocks the output of the Rx Buffer for delivering data to
the Rx port at the user interface. Select
Rx-Sat, Tx-Terr or Ext-Clk using the
W X
arrow keys,
then press
ENTER
.
Note the following:
Rx-Sat
(default)
Effectively disables the Rx Buffer because the input and output clocks are the same.
Normally, the Rx Buffer is set for minimum when Rx-Sat is selected.
Tx-Terr
Uses the clock from the Tx input to clock out the Rx Buffer.
Ext-Clk
Derives a clock from a signal input to the Ext-Clk connector on the E3/T3/STS-1 Interface
Card.
If Intfc1 Port1 Rx: Æ Ena/Dis is selected:
Intfc1 Port1 Rx Status
Enable Disable (
E)
Using the
W X
arrow keys, select Enable to activate the receive side of Port1, or select Disable
to
de-activate
the receive side of Port1 and change the Data Rate to 0. Press
ENTER
when done.
(CONFIG:) Intfc1 E3/T3/STS1
Æ
Ext-Clk
Intfc1 Ext-Clk Freq:
1.000 Mbps (
E)
Set the input frequency for the Ext-Clk connector on the E3/T3/STS-1 Interface Card by using the
ST
arrow keys, then press
ENTER
. Note the following:
•
The Ext-Clk Frequency source selections (in MHz) are: 0 (None), 1 , 2 , 5 , 10 , 2.048 ,
34.368 , 44.736 , and 51.84 .
•
The input level ranges from 0.5 to 5.0 volts peak-to-peak.