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Setting up the Interfaces of the Gateway
Setting up the Wireless LAN
SRP 521 VoIP Gateway Administration Guide
REVIEW DRAFT — CISCO CONFIDENTIAL
Field
N Transmission Rate
CTS Protection
Mode
DTIM Interval
Fragmentation
Threshold
Beacon Interval
Description
The rate of data transmission should be set depending
on the speed of your Wireless-N networking. You can
select from a range of transmission speeds, or you can
select Auto to have the gateway automatically use the
fastest possible data rate and enable the Auto-Fallback
feature. Auto-Fallback will negotiate the best possible
connection speed between the gateway and a wireless
client. The default is Auto.
The gateway will automatically use CTS (Clear-To-Send)
Protection Mode when your Wireless-N and Wireless-G
products are experiencing severe problems and are not
able to transmit to the gateway in an environment with
heavy 802. 1 1b traffic. This function boosts the
gateway's ability to catch all Wireless-N and Wireless-G
transmissions but will severely decrease performance.
The default is Auto.
This value, between 1 and 255, indicates the interval of
the Delivery Traffic Indication Message (DTIM). A DTIM
field is a countdown field informing clients of the next
window for listening to broadcast and multicast
messages. When the gateway has buffered broadcast
or multicast messages for associated clients, it sends
the next DTIM with a DTIM Interval value. Its clients hear
the beacons and awaken to receive the broadcast and
multicast messages. The default value is 1.
This value specifies the maximum size for a packet
before data is fragmented into multiple packets. If you
experience a high packet error rate, you may slightly
increase the Fragmentation Threshold. Setting the
Fragmentation Threshold too low may result in poor
network performance. Only minor reduction of the
default value is recommended. In most cases, it should
remain at its default value of 2344.
The Beacon Interval value indicates the frequency
interval of the beacon. A beacon is a packet broadcast
by the gateway to synchronize the wireless network.
Enter a value between 20 and 65,535 milliseconds. The
default value is 100.
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