Maintenance
M7/M7L/M7LT Modular Satellite Modem
3-112
M7/M7L/M7LT - Rev. 0.05
NOTE: It is important in L-Band systems to use special splitters and combiners that have the ability
to pass DC used to power the BUC and LNB with sufficient current capacity
.
3.14.1. Set-Up Procedure for 1:1 Redundancy (Future Option)
If redundancy mode is to be set up between a pair of modems then the following procedure is
followed during installation and setup:
1. Physically install both units to be paired and connect the IF transmit and receive coaxial
cables
, special data “Y” cable, and Auxiliary cable connection on both units. For
convenience we will arbitrarily call one modem “Primary” and the other “Secondary”.
2. Power-up and configure the primary modem completely for the intended operating
parameters, including setting the
<Unit: Redundancy
– Mode>
parameter to “1:1”. This
initial unit should not be in alarm.
3. Turn the power on the secondary unit on.
4. Go to the primary unit menu item
<Unit: Redundancy
– Config>
and press the “Edit” key.
The on-line unit will ask permission to transfer configuration to the second unit with the
prompt
“Config Backup?” Confirm by pressing “Enter”. The primary unit should say “Sending
Config” for approximately 1 second. If the transfer of any packet results in an error, a “Send
Fail” message will be displayed, but transfer will continue.
5. Verify that the units are functioning correctly in redundancy mode. Go to the
<Unit: Status
–
Redundancy>
item in both units. The on-
line unit will say “On-Line, Bckup OK” while the off-
line unit will say “Standby, OK”.
Physical installation of the two units is best accomplished with one unit directly beside or above the
other in the rack. This allows the status of the two modems to be seen together and avoids confusion.
CAUTION!: Care should be taken that both units are not turned on in a non-redundant
configuration wit
h the “Y” data cable installed. This will result in the two unit’s data
output drivers possibly conflicting and causing damage.
During configuration of the primary unit several new parameters will become available after the mode
is set to 1:1. In addition to the
<Unit: Redundancy - Config>
parameter of step 4 above there will
also be parameters that allow the alarms and timing to be configured for the application. The default
values for these parameters are probably good in most installations, but they may require specific
configuration, especially if the unit had been configured for another unique application. These new
parameters are:
<Unit: Redundancy
– Sw Rqst>
- This parameter allows you to determine which alarm
indications result in a switch request. T
he possible selections are “On Minor Or Major” or “On
Major Alarm
”.
<Unit: Redundancy
– Sw Hold>
- This parameter determines how long an alarm must exist on
the on-line unit and not the off-line unit before switching will occur. Allowable values are 0.0 to
600.0 seconds. The value could be set to zero, but this is not advised. A nominal value of 0.5
seconds insures that intermittent cases do not cause undue switching. A built in factor of 10
seconds is provided once a switch has occurred before a switch back to the original unit is
allowed (except in the case of a manual switch request or loss of power in the on-line unit which
requires 2 seconds).
3.14.2. Teardown Procedure for 1:1 Redundancy
Teardown or un-pairing of two redundant units is accomplished by turning both units off before
removing the “Y” cable. Then power on each unit and set the
<Unit: Redundancy
– Mode>
to
“Disabled”.
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