Proxim HARDSAP Manuel D’Utilisation

15

If the cells of multiple Access Points overlap, then the mobile client may switch from one
Access Point to another as it travels throughout the facility.  During the hand-off from
one Access Point to another, the mobile client maintains an uninterrupted connection to
the network.  This is known as “roaming.”

Multiple Access Points connected to a common Ethernet network form an Extended
Service Set (ESS).  All members of an Extended Service Set are configured with an ID,
known as the SSID or ESSID.  Mobile clients must be configured with the same SSID
as the Access Points on the network; a client can only roam between Access Points that
share the same SSID.

❑ An 802.11b PC Card can only roam between 802.11b Access Points.  An

802.11b PC Card cannot communicate with Harmony OpenAir Access Points.

❑ All Harmony 802.11b Access Points must have the same SSID.

❑ All workstations with Harmony 802.11b PC Cards must have the same SSID

as the Access Points that they will roam between.

❑ If WEP encryption is enabled, then all 802.11b Access Points and PC Cards

must use the same encryption level and WEP Key(s) to communicate.

❑ The Access Points’ cells must overlap to ensure that there are no gaps in

coverage and to ensure that the roaming client will always have a connection
available.

❑ All Access Points in the same vicinity should use a unique, independent

Channel.  There are three independent Channels for 802.11b Access Points.

❑ Access Points that use the same Channel should be installed as far away from

each other as possible to reduce potential interference.