Chassis Critical Alarm
If a Chassis Critical alarm is asserted, or if nCC loses communications with the chassis, nCC will switch all the outputs generated in
the failed chassis to a suitable spare chassis if one is available.
Control Network Redundancy
Overview
The control network is assigned to the physical Ethernet ports Ctrl1 and Ctrl2. The lower number port of the pair is considered to be
the
primary port
, and the other the spare.
Operation
If both ports have a link up, and the Control Port Selection is set to Automatic Redundant, then the
primary port
will respond to
network traffic, but the spare port will not.
However, if the link goes down on the primary port, then the spare port will start to respond to network traffic.
Automatic Redundancy Mode
In automatic redundancy mode the
primary port
is used as default. If the primary port link fails, control passes to the secondary
port. However, if the primary port link is restored then control passes back to the primary after the
Auto-Revert
delay period.
The behavior of the system when the primary link is re-established depends on the Control Port Auto-Revert Time setting.
If the Control Port Auto-Revert Time is set to 0, then the spare port remains the active control port until its link goes down.
Otherwise, after the primary port has had a link present for the defined period of time, it will resume being the active control port,
and the spare port will cease responding to network traffic.
Auto Revert Delay
If the control port selection = Automatic, then the Auto-Revert Delay defines the period for which the primary port must have
resumed a link up state before it automatically becomes the active port.
The Auto-Revert Delay period is set in the range 0 to 999 seconds, with 2 seconds being the default value.
If this is set to 0 then there is no automatic switch back to the primary port
IP Encapsulation of Transport Streams
Mapping of MPEG-2 TS Packets
The mapping of MPEG-2 TS packets into IP data frames is done according to the protocol stack shown in the following illustration.
© Ericsson AB 2011. All rights reserved
© Ericsson AB 2011. All rights reserved
© Ericsson AB 2011. All rights reserved
Page 143 of 153
Cover
9/11/2012
file://C:\Users\ebriacl\AppData\Local\Temp\~hh7DF.htm
