R2511-HP MSR Router Series WLAN Configuration Guide(V5)

16
Ste
p
Command Remarks
10. Set the DTIM counter.
dtim counter
Optional.
By default, the DTIM counter is 1.
11. Specify the maximum length of
packets that can be transmitted
without fragmentation.
fragment-threshold size
Optional.
By default, the fragment threshold is
2346 bytes and must be an even
number.
12. Set the maximum number of
retransmission attempts for frames
larger than the RTS threshold.
long-retry threshold count
Optional.
By default, the long retry threshold
is 4.
13. Specify the maximum number of
attempts to transmit a frame
shorter than the RTS threshold.
short-retry threshold count
Optional.
By default, the short retry threshold
is 7.
14. Specify the interval for the AP to
hold received packets.
max-rx-duration interval
Optional.
By default, the interval is 2000
milliseconds.
15. Configure collision avoidance
• Specify the request to send
(RTS) threshold length.
rts-threshold size
• Specify a collision
avoidance mechanism.
protection-mode
{ cts-to-self | rts-cts }
• Optional.
By default, the RTS threshold is
2346 bytes.
• Optional.
By default, the collision
avoidance mechanism is
CTS-to-Self.
Configuring 802.11n
The following matrix shows the feature and router compatibility:
Feature MSR900 MSR93X MSR20-1X MSR20 MSR30 MSR50
802.11n No
Available for
JG512A,
JG519A and
JG597A
Available for
routers with a
SIC_WLAN
module that
supports
802.11n
Available for
routers with a
SIC_WLAN
module that
supports
802.11n
Available for
routers with a
SIC_WLAN
module that
supports
802.11n
Available for
routers with a
SIC_WLAN
module that
supports
802.11n
As the next generation wireless LAN technology, 802.11n supports both 2.4-GHz and 5-GHz bands. It
provides higher throughput by using the following methods:
• Increasing bandwidth: 802.11n can bond two adjacent 20-MHz channels together to form a
40-MHz channel. During data forwarding, the two 20-MHz channels can work separately with one
acting as the primary channel and the other acting as the secondary channel or working together
as a 40-MHz channel. This provides a simple way of doubling the data rate.
• Improving channel utilization through the following ways:
{ 802.11n introduces the A-MPDU frame format. By using only one PHY header, each A-MPDU
can accommodate multiple MPDUs which have their PHY headers removed. This reduces the
overhead in transmission and the number of ACK frames to be used, and improves network
throughput.