Echelon IP-852 Channel - Manual (Page 31)

IP-852 Channel User’s Guide 23
Table 3.1 describes each channel mode.
Table 3.1 Channel Modes
Setting Description
Backward
Compatible Select this option if your channel will contain any legacy
i.LON 1000 servers or LNS 3.0 L
ON
W
ORKS
/IP network
interfaces. This causes the IP-852 device to operate
using a protocol that is compatible with these devices,
but is not strictly EIA-852 compliant.
In backward compatible mode, you can use a maximum
of 40 devices. If you select this option, you can only have
one device located behind each NAT firewall, the i.LON
1000 and LNS 3.0 devices cannot be located behind a
NAT firewall, and you cannot have duplicate IP
addresses or duplicate port assignments.
Standard EIA-852 Select this option if your channel contains any mix of IP-
852 compliant devices. You can use a maximum of 256
IP-852 devices per channel in Standard EIA-852 mode.
In Standard EIA-852 mode, you can only have one device
located behind each NAT firewall. The IP address
(including the port assignment) must be unique.
Extended Firewall
Support Select this option whenever your IP-852 channel crosses
an IP firewall, regardless of whether the firewall is
using Network Address Translation (NAT).
Depending on the particular firewall and its
configuration, this option may be required. In addition,
this will allow you to place more than one IP-852 router
device behind an NAT firewall, and to create multiple
IP-852 interfaces in the same channel using the same IP
address (but with different ports).
If this option is disabled, only one device may reside
behind a NAT firewall, and all devices on the channel
must have unique IP addresses. This option extends the
EIA-852 protocol in a way that is not strictly compliant
with that standard, though it should still be compatible
with other IP-852 devices. You can use up to 256 devices
per channel in this mode.
Aggregation
Click the Protocol tab and then select the Aggregation check box to enable
aggregation on the IP-852 channel. Each IP-852 router aggregates L ON W ORKS packets
for transport over the IP channel. L
ON
W
ORKS
packets are relatively small in size and
often arrive at the IP-852 router in bursts or at a high rate. Aggregating packets
decreases the bandwidth necessary to send packets over IP, decreases IP network traffic,
and increases the performance of the IP-852 router.
The IP-852 router is set through the IP-852 Configuration Server to use aggregation by
default. The aggregation time parameter controls how long the router will wait for