ARRIS Router Setup – Web GUI User’s Guide
Page 64 of 92 January 2012
Beacon Interval – Sets the time interval between beacon transmissions in milliseconds. The
router uses these transmissions to synchronize the wireless network and its client devices. For
compliance with most client devices, the Beacon Interval should remain set at the default of
100ms. The allowable setting range is from 20 to 1024ms.
DTM Interval – Sets the DTIM (Delivery Traffic Indication Message) Interval. The DTIM Interval
informs the wireless client devices of the next available window for listening to broadcast and
multicast messages. When the router sends a DTIM beacon the client devices hear the beacon
and then listen for the messages. For compliance with most client devices, the DTIM Interval
should be left at 1 ms. The allowable setting range is from 1 to 255 ms.
RTS Threshold – Sets the packet size limit. When the threshold is passed, the ready to
send/clear to send (RTS/CTS) function is invoked. The default setting is 2347 bytes. The
allowable setting range is from 1 to 2347 bytes.
Fragment Threshold – Sets the fragmentation threshold. This threshold should be set to equal
the maximum Ethernet frame size allowable on the link including overhead. Setting a lower
threshold can damage data throughput since large frames could be fragmented and/or collisions
could occur. The default setting is 2346. The allowable setting range is from 255 to 2346 bytes.
Frame Burst – Click this checkbox to enable Frame Burst on your network. Frame Bursting is a
transmission technique that increases the throughput of point-to-point 802.11a, b, or g links by
reducing the overhead associated with the wireless transmissions. This results in the ability to
support higher data throughput in mixed and uniform networks. It can, however, result in
unfair allocation of airtime where there are a mix of client devices on the network, of which only
some support Frame-Bursting.
WMM Power Save Mode – Click this checkbox to enable WMM Power Save Mode. WMM
Power Save delivery is a more efficient power management method than legacy 802.11 power
save polling.
Enable Radio (Technician level only) – Click this checkbox to enable or disable the WiFi radio.
80211n Specific Settings:
Operation Mode – Sets the 802.11n Operation Mode. Options are Mixed Mode or Greenfield.
The default, Mixed Mode, is for networks with a mix of 802.11a/b/g/n client devices. The
optional Greenfield mode improves efficiency of networks using only 802.11n devices by
eliminating support for the 802.11a/b/g client devices.
Channel Bandwidth – Sets the 802.11n Channel Bandwidth. Options are 20 MHz or 20/40 MHz.
The default setting is 20 MHz.
Guard Interval – The spacing between transmission of symbols in nanoseconds. Can be set to
400ns or 800ns.
MCS – Sets the 802.11n Modulation and Coding Scheme to be used. Options are 1 through 15
and AUTO. The default is AUTO. The 802.11n standard defines a total of 77 MCS. Each MCS
specifies a certain modulation type (BPSK, QPSK, 64-QAM), coding rate (1/2, 3/4), guard interval
