Ericsson RX1290, Reference Manual

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6.5 100/1000BaseT Dual IP Input – RX1290/HWO/GIGE
Dual IP NIC Input card provides a 100/1000BaseT Ethernet port, on which a
transport stream can be received in UDP packets at up to 208 Mbps.
The card can receive RTP encapsulated transport streams. RTP encapsulation
provides a more robust transport stream than UDP encapsulation. RTP
encapsulated transport streams are resistant to service disruption related to “IP
reordering”. IP frame reordering can occur inside an IP interconnection device (e.g.
hub, switch, router) or when a IP/TS stream can take multiple routes to a
destination. RTP encapsulation will introduce an overhead.
When you have Dual IP NIC option card installed, a few redundancy modes became
available:
Use Input Ports - Port 1/Port 2/Auto.
Auto Revert Delay – delay in seconds.
Alias names : Primary Port is Port 1, Secondary Port is Port 2
6.5.1.1 Mode of Operation when input port is set to Auto
A link down or TS lock drop on the primary port would cause a switch from the
primary to the secondary port. When the primary link is up again, the action depends
on the user’s setup.
6.5.1.1.1 Switch back
If the auto-revert is non-zero, the unit would automatically switch back to the primary
port, after linkup has been indicated for a defined length of time, this length of time is
the auto-revert time the user specifies. The delay is present to allow an opportunity
for the switch to boot, configure and enter normal operation.
Before the switchback to the primary port check the primary link status is up, if it is
down, stay on the secondary port and wait till the primary link is up again and repeat
the process again.
6.5.1.1.2 No switch back
If the auto-revert is set to zero, this indicates that the user will switch back manually,
so no action is taken.
If the active port is the secondary port and the redundancy mode is set to Auto, if the
link is up on the primary then it would cause an automatic switch to the primary port
without checking the link up length time.
EN/LZT 790 0003/2 R1A 6-7