Table of Contents
Advertisement
QMultiFlex-400™ Installation and Operating Handbook
Monitor demod: Defines which demodulator will be used to detect if the hub outbound
carrier has a problem. Since monitoring a demod is a mandatory requirement for Geo
Redundancy to work, it is worth noting that a single demod is limited to 40Msps, thus this
limits the out-bound carrier to 40Msps.
NB: The packet output of this demodulator is always disabled, so that a loop is not formed.
This setting must be '0' when not using Geo Redundancy.
Threshold Es/No: Optionally set, if it is desired to switchover if the Es/No falls below this
threshold. If not required, set to -99dB.
Hold Off: Timer to limit the changeover rate. Timer starts when any change-over occurs
and prevents another changeover until it has expired.
The Geo redundancy status shows the geo redundancy status of the modem. This will be
shown as Main when the modem is online, Masked when the modem has been taken out
of service, and Standby when the modem is offline, ready to switch over on a fault occurring
with the online modem. If not enabled, it will show Not enabled.
Peer status: Displays 'OK' if the peer can be switched to, or 'Not ready' if in the peer modem
is in Maintenance mode or the Hold-off timer is running or a fault condition exists that
prevents the peer from becoming active.
Last Switchover: Date and time stamp from modem RTC when last switchover occurred.
Switch to standby: If this modem is Geo Main, pressing this button will cause the modem
to go to Geo standby unless the other modem is indicating a fault. Asserts fail signal in IP
messages for 5 seconds.
Switch to maintenance: Holds this modem permanently in Geo standby by permanently
asserting fail signal. Maintenance mode can be cancelled by pressing button to 'Switch to
service'. NB: Do not switch to 1:1 maintenance mode afterwards, as it will cause a 1:1
switchover and the newly active modem will not be in Geo maintenance.
Enable: Once all parameters are entered in both modems – enable Geo Redundancy to
activate. See 'Start-up Condition' below.
Figure 6-56 Redundancy Screen – Example Settings
See
Section 8.5
for system level details.
6-72
Advertisement
Table of Contents
