User guide

Radiance 1000Mbps Redundant Interface Line Cards 19
Back-to-Back Application
A typical application of the 1000Mbps redundant interface line cards is to use
them in pairs to extend a network’s reach between two remote devices. In this
back-to-back setup, both PRIMARY ports are linked to each other and both
SECONDARY ports are linked to each other as shown in the figure below.
1000Mbps Switch
PC running Network
Management Software
Radiance R5000 with
1000Mbps Redundant
Interface Line Cards
1000Mbps Switch
PC running Network
Management Software
up to 100 km singlemode
Radiance R5000 with
1000Mbps Redundant
Interface Line Cards
In a back-to-back application, make sure that the following switches are enabled
on both redundant interface line cards:
1. RED switch. Sets the card to operate in Dynamic Recovery Mode. In this
mode, the SECONDARY port automatically becomes the active port if
the PRIMARY link is lost and the SECONDARY link is present.
2. TX switch. Allows the redundant interface line card to transmit data on
both the PRIMARY and SECONDARY ports simultaneously. The cards
must have this switch enabled because they cannot determine which port
is active on the other card.
3. LINK switch. This allows link pulses to be sent out both the PRIMARY
and SECONDARY ports. If neither SECONDARY port is transmitting
link pulses and one of the PRIMARY ports loses link, a switchover will
NOT occur. A switchover will occur only if the SECONDARY port has
link. (LINK is not applicable to the R752-11.)