3-18
RF-7800W
SYSTEM ADMINISTRATION AND CONFIGURATION
without prior knowledge of the SC operating frequency. It can also be helpful when an SS is configured on multiple
SCs and one of the SC is interfered with or is taken down for maintenance.
3.8.4.3 Roaming
Subscriber Stations have the ability to scan different frequencies and channel sizes for Sector Controllers while
maintaining a link to an SC. Once an SC is discovered that is sufficiently better than the old SC, the SS will
deregister with the old SC and register with the new SC. The new SC then sends Layer 2 updates to the network for
each MAC address that is located on the SS side of the link in order to make the network aware of the new location
of the nodes. Refer to Paragraph 4.3 for additional Roaming information. Enabling Roaming will implicitly enable
Auto-Scan.
Roaming reduces the maximum possible user data throughput
by around 10 percent.
The Link ID may change when Roaming between SCs.
LLC packets are used for Layer 2 updates.
3.8.4.4 Frequency Lists
The operating frequency band is sometimes wider than necessary for a given installation. Frequency lists allow for
the radio to be further restricted from known interference or licensed frequency bands. The Auto-Scan, DFS and
EIM features respect these frequency band limits. See Figure 3-11.
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