Comtech EF Data CDM-760 - Manual (Page 132)

Front Panel Operation Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–46
Selection
(Mask)
Description
Available Mask State
A F M F/T
EthLink
This indicates that an Ethernet Interface is selected using the CONFIG: Intf
menu (Sect. 6.2.2.4) as the active interface, but an Ethernet cable with
Ethernet traffic has not been detected on this physical port.
X X X X
For each mask selection, use the  arrow keys to set the available mask state as noted in the
previous table. Press ENTER. Note the following:
Mask Type Unit Status LED Color Fault State Visible Location
Alarm Amber None Monitor: Live Alarms menu
Fault Red J1 Alarm Connector Monitor: Stored-Events log
Mask None None
None: A masked event is not
logged and is not seen in
any menu.
Fault-Tx On Red J1 Alarm Connector Monitor: Stored-Events log
6.2.2.10 (CONFIG:) Ref
Modem Reference: Internal
Internal Ref Fine Adjust:-001 ()
Use the   arrows keys to select Modem Reference or Internal Ref Fine Adjust. Press ENTER.
6.2.2.10.1 (CONFIG: Ref) Modem Reference
Use the  arrow keys to select a parameter. Press ENTER.
Note the following:
• Select Internal mode to frequency-lock the modem to the high stability ±0.06 ppm 10 MHz
internal oscillator.
• Select Internal+O/P (Internal with Output) mode to use the 10 MHz internal reference an
output on the rear panel J8 | EXT REF BNC connector. This mode is useful when you desire
to use a single frequency reference for both the modem and another piece of equipment in
the system. When selecting this mode, a green LED adjacent to the connector illuminates to
alert you that the connector, normally used as input, now has an output signal present.
• Select the Ext 1 MHz, Ext 2 MHz, Ext 5 MHz, or Ext 10 MHz mode to frequency-lock the
modem to an injected external reference on the rear panel J8 | EXT REF BNC connector.