Comtech EF Data CDM-710G - Manual (Page 102)

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.