Nortel 6220 User Manual page 116

Setting a base station to non-polling mode may increase performance in
the rare case where all satellites can hear one another (i.e. there are no
hidden nodes), or when there is sporadic network use. In an environment
where most network traffic is with one satellite, and other satellites rarely
transmit data, this setting may also increase performance. However, it is
highly recommended that you select one of the polling modes.
Selecting this Secure Data Mode Base Station Mode takes full advantage
of the features of a Secure Data Mode Network.
Polling Base Station
Selecting this Secure Data Mode Base Station Mode sets the Secure Data
Mode Station to run as a Secure Data Mode Base Station which performs
a highly optimized Nortel Networks-proprietary polling of the satellite
stations for data. In the Non-Polling Base Station mode, all wireless
stations must be able to 'hear' each others' traffic, or performance may
degrade considerably (the hidden node problem). In polling mode, the
Base Station will poll each station for data, and also offer the opportunity
for 'free-for-all' sending of data at set intervals.
In conjunction with the standard features of the Secure Data Mode
Network, this Secure Data Mode Base Station Mode offers a significant
performance increase over other wireless protocols when the network is
under a heavy load.
ISP Base Station
Selecting this Secure Mode Base Station sets the Secure Mode Station to
run as a base station for connections to Microsoft Windows PC Clients.
This mode takes full advantage of the features of a Secure Mode
Network and allows Windows clients to connect directly to the base
station, eliminating the need for an Ethernet connection to a second
Secure Mode Station running as a Remote Secure Mode Station.
The following Windows clients are supported:
Windows 95a (with the Winsock 2 update)
Windows 95b
Windows 98
Windows NT 4.0
Windows XP
To filter Ethernet protocols that are transferred between the wireless
stations (for example, to disable the Windows Network Neighborhood),
select ISP Base Station with Protocol Filtering. Filters set in Bridge
WLAN Cable Access Point 6220 CSU NTPM99CA Rel 2.0 Issue 5 Dec 2005
117