User manual

TD990200-0ME
8
Design Considerations
NCM Compatibility
The Metasys Ethernet Router is compatible with all versions of the
NCM200 and NCM300. If NCM101s/401s are used, they must be
Revision K or later. It is possible to upgrade the EPROM chips in
older NCM101s/401s for compatibility with the Metasys Ethernet
Router. For information about upgrading, contact Field Support
Services. (NCM102s cannot be used.)
Quantity of Routers Needed
The quantity of Metasys Ethernet Routers you need is identical to the
number of ARCNET segments connected through the Ethernet
system. For example, two Metasys Ethernet Routers are required to
connect two ARCNET segments over one Ethernet segment (see
Figure 3). A router is placed at each location where the Ethernet
segment meets the ARCNET segment. Up to 50 Metasys Ethernet
Routers can be used on each Metasys Network (i.e., all ARCNET
segments).
Physical Considerations
The router can be installed in a variety of ways, depending on the job
site. When selecting a location, consider the following:
1. The location must have access to the customer’s Ethernet
network, the ARCNET segment that the router will service,
and power.
2. Depending upon the model, a MOD HUB can be panel-
mounted, rack-mounted or desktop mounted. See MOD HUB
manual for details.
Design Summary
Use these steps as a guideline when designing a Metasys Ethernet
Router Network, referring to Figure 3 for an example:
1. Lay out the network as you would a normal Metasys N1
Network. Determine the number and location of NCMs and
Operator Workstations that will service the facility.
2. Determine which portions of the network will use ARCNET and
which will use Ethernet. The network layout must consist of
multiple ARCNET segments connected by the customer’s
Ethernet network.
The Ethernet network must be a single Local Area Network
(LAN) that can interconnect all of the ARCNET segments.