Comtech EF Data CDM-750 - Manual (Page 136)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Front Panel Operation MN-CDM750
5–58
5.2.7.4 Utility: 1:1
1:1 Manual/Auto Force
Use the W X arrow keys to select Manual/Auto or Force, and then press ENTER
. Note the
following:
Selection Description
Manual/Auto
(
Use the
ST
arrow keys to
select Manual
or Auto, and
then press
ENTER)
Manual The currently online modem remains online regardless of any current or future
faults. Online and offline modems remain in this state until you Force the
switchover.
Auto The redundancy switch chooses which modem is online based on fault conditions:
• If the original online modem, Unit ‘A’ becomes faulted, then switch occurs to
the offline modem, Unit ‘B’ only if it is fault-free.
• Operation can not revert back to the original online modem, Unit 'A, until it
clears its faults.
• Switchover back to Unit ‘A’ occurs only if the new online Unit ‘B’ becomes
faulted and Unit ‘A’ is clear of any faults.
Force
(
press ENTER to force
switchover, subject to
the conditions specified
here)
The conditional states for forced switchover are identified on this screen as
follows:
• 1:1 redundancy is Not Connected
This message indicates that the modem’s rear panel J2 | REDUNDANCY
connector is not connected to a supported 1:1 redundancy switch such as the
CRS-170A or CRS-180.
• This Unit is in Standby (1:1 only)
This message indicates that the modem is properly connected to a supported
1:1 redundancy switch but the modem is the backup. You can only “Force” a
switch to the backup by forcing the Online modem to go Offline. You can not
force the backup to go online.
• Press ENTER key to force Unit into Standby (1:1 only)
This message indicates that the modem is connected to a 1:1 switch and the
modem is online. Press ENTER to force this modem offline and bring the
alternate modem online.
5.2.7.5 Utility: 1:N
1:N Redundancy: Disabled
Use the ST arrow keys to select 1:N Redundancy as Enabled or Disabled, and then press
ENTER
.
If the unit is connected to a Comtech EF Data CRS‐500 M:N Redundancy System (as
part of a 1:N system), this setting must set to Enabled. In all other circumstances
(i.e., standalone operation or 1:1 Redundancy), 1:N Redundancy must be set to
Disabled.