
Appendix A ’Technical Specifications’ — Signal Processing
200
Amethyst III DTV Smart Switch
User Manual
IP traffic
forwarding
By default, the traffic that arrives on a Gigabit Ethernet
interface is not forwarded to another interface.
Some ARP rules may be activated because filtering ARP
may block all the unicast traffic (the corresponding
forwarding rule is that all ARP datagrams coming from an
interface are sent to all the other Gigabit Ethernet
interfaces)
Or other forwarding rules may be activated in order to
indicate that IP datagrams shall be forwarded to another
interface. A forwarding rule is configured as follows:
Identification key:
Source Gigabit Ethernet interface (optional)
IP protocol: IPv4, ARP.
Source IP address (optional)
Destination IP address (optional)
Protocol: TCP, UDP, ICMP, IGMP (optional)
Source TCP/UDP port (optional)
Destination TCP/UDP port (optional)
VLAN tagging
List of destination Gigabit Ethernet interfaces
Fail-over
There is no specific processing for fragmented datagrams,
so the forwarding rule may not correctly operate in this
case. Therefore a fragmented stream may be partially sent
to the destination interface.
T2-MI
ASI seamless switching supported on THOMSON
NetProcessor T2-MI gateways (v04.70 and following)
ASI input bit rate: from 20Mbps to 80 Mbps
Maximum number of PLP per T2-MI PID: 32
The stuffing level in the stream shall be reasonable
(the T2-MI PID bit rate shall be above 50% of the
global TS bit rate)
The PIDs embedding T2-MI packets shall be identical
on both streams.
The seamless switching is guaranteed on the T2-MI
layer. When a switch occurs, CC on the T2-MI PID is
preserved.
a
IPv4 options present in the IP header are not processed, but they are not
discarded and can then be processed as any other device when the datagram
is forwarded to the output, whether IP masquerading is enabled or not.
Table A-3. Gigabit Ethernet interfaces specifications
Summary of Contents for Amethyst III
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