SVWUX Wireless Network Topology

Topology

The EWN will be a long range 802.11b/g/n broadband terrestrial microwave network connecting service nodes such as EOC's and hospitals by way of repeater nodes on hilltops and towers throughout Santa Clara Valley.

Terms

ISP

A site which provides a hardwire internet connection to the network. (A superset of Node functionality, usually).

Node

A site which does not have direct internet connectivity, but, which provides feeds to/from other sites.

Leaf

A site which is downstream from a Node or ISP and does not feed any other Node or Leaf sites.

Addressing Scheme

Geography ID Table

Site ID Table

Service Nodes (Clients)

1. To be more concise, EOC names will typically be abbreviated using RACES tactical call signs as listed in this directory.
2. SJCEOC has a complementary 22 dBi dish which completes the 16.7 km link with Los Gatos Hills. Along side it is also an omni-directional antenna to enable connection to the Santa Clara County EOC, a few blocks away, as well as to the San Jose Backup EOC which is across the parking lot.

Internet Gateways

There are two wireless node types: client and gateway. A client is a node that does not have an independent Internet connection. A gateway is a node that has an independent Internet connection that shares its bandwidth with other users connected to the EWN. (For more information about setting up a client or gateway, visit the "howto" pages for each.)

1. An internet gateway now exists connected wirelessly to the Los Gatos site. The connection has not been reliable though and needs more analysis. Signal appears to be adequate, but link is not being sustained.
2. One other important aspect of our network is that we will eventually use IPv6 throughout, though not exclusively. We will use IPv4 alongside IPv6, but our IPv4 address space is currently non-routable. Our IPv6 addresses are fully routable. If you are not yet IPv6 capable, see the NetworkingResources page.

Current Network Layout

• SCEWN Diagram 2009-12-10 (pdf):