Aggregation – Echelon IP-852 Channel User Manual

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IP-852 Channel User’s Guide

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

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

ORKS

packets

for transport over the IP channel. L

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