UHP SCPC MODEM
USER MANUAL, v3.2
© ROMANTIS 2015
20
www.uhp.net
Every 4 seconds both routers exchange information about their status via UDP protocol. When the router gets
switched on, its status is BACKUP. The router launches a 10 sec. timer and waits for messages about the second
router’s status during this time. If it does not receive information about the status of the second router by the end
of this time, or it receives FAULT or BACKUP message from the second router, the first router switches to TRYING
mode. This is the mode in which the router activates transmission and waits for confirmation of connection by the
remote Station. If connection is established, this router switches to ACTIVE mode and informs about this mode the
second router so the latter remains in BACKUP standby mode.
P
LEASE NOTE THAT
SCPC
REDUNDANCY MODE REQUIRES THAT
SCPC
TLC
MODE IS ACTIVE AND RUNNING
,
AS FAR AS
IT IS USED TO IDENTIFY OUTAGES OF THE
SCPC
CONNECTION
.
If both routers try to transmit a carrier simultaneously, the router with a higher serial number gets priority.
All external network devices recognize redundant UHP routers as one device. It is achieved by ensuring that only
the router in ACTIVE mode processes ARP queries. Each router should have identical IP-addressing, routing,
modulator and demodulator configuring settings.
N
OTE THAT ROUTERS DO NOT CHECK IF THEIR SETTINGS ARE IDENTICAL AND IT SHOULD BE PROPERLY CONFIGURED AND
VERIFIED DURING INSTALLATION
.
To monitor and operate the routers regardless of their condition an additional IP-address must be configured on
each router. This IP-address and all related traffic will belong to the respective router regardless of current
redundancy status.
Figure 22 1:1 redundant router connection diagram
2.5.1
Redundancy Configuration
To activate 1:1 redundancy of the router, the following actions are required:
1.
Connect the routers as shown in the diagram in the Figure 22;
2.
Ensure the same configuration of profiles and routing tables on both routers;
3.
Assign an additional IP address to the main router’s Ethernet interface. This address will be used to access
the backup device. The backup router should be assigned an IP address in the same network where there
is the additional IP address of the main router.
SCPC Rx
Tx Out
TDMA Rx
SCPC Rx
Tx Out
TDMA Rx
Rx
Tx
LAN
LAN
LAN
DC pass
DC pass
DC & 10MHz pass
DC & 10MHz pass
UHP Router
Ethernet Switch
Main IP: 192.168.1.1
Add IP: 192.168.12.1
Main IP: 192.168.1.1
Add IP: 192.168.12.1
UHP Router
