PENTAGRAM Cerberus [P 6367]
BSSID: Basic Service Set Identifier of wireless network. In IEEE802.11, BSSID is the MAC
address of wireless access point.
Channel: The channel used by the current router. You can select other effective channels from
the drop-down list. There are channels 1 to 13 for your options. When there are many wireless
signals around, you can select a different channel to reduce interference.
Operating mode: works in 11n mode only. Different wireless standards involve different frame
formats in physical layer. Green Field mode can greatly improve the wireless transmission
efficiency. However, if the device that is using 802.11n Greenfield mode does not adopt the
same channel width that of 802.11b/g base station, device in 802.11b/g mode can not
communicate with the Greenfield connection point. On the contrary, there will be collision,
errors and resending in the information transferring process between them. For common usage,
we recommend that you use the Mixed Mode, which integrates traditional mode and Green Field
mode.
Channel bandwidth: Select the best channel bandwidth to enhance the wireless performance.
When there are 11b/g and 11n wireless clients, please select the 802.11n mode of 20/40M
frequency band; when there are only non-11n wireless clients, you can select 20M frequency
band mode; when the wireless network mode is 11n mode, please select 20/40 frequency band
to boost its throughput. After you finish the settings, click Next to enter the interface for
wireless encryption settings.
Guard Interval: Works in 11n mode only. 802.11b/g standards require there’s an 800ns interval
between the information signs when sending them and this interval is called Guard Interval
(GI).Different GIs determine whether there’s interference affecting the transmission rate while
sending the signal. We recommend that you use the default value.
MCS (Modulation Coding Scheme): Works in 11n mode only. The physical rate relies on several
elements such as modulation method, encoding rate, the amount of the three-dimensional flow,
40MHz binding or not, thus, these elements which influence throughput combined will
generate multiple physical rates for you choices. MCS can be interpreted as the complete
combination of the elements which influence the rate. Each combination is uniquely marked
with an integer.
Extension Channel: To figure out the network frequency range in 11n mode.
Aggregation MSDU: Aggregates multi-MSDU to become a bigger load. The MSDU can be
considered as an Ethernet Message. Usually when AP or wireless client receives the message
(MSDU) from the protocol station, they would mark it with Ethernet Head, which is called A-
MSDU Sub-frame. However, it needs to be converted to 802.11 message format before being
sent out through RF port. And A-MSDU technology aims to aggregate several A-MSDU Sub-
frames and send out by encapsulating them into an 802.11message.Thus, it reduces the
occupied bits of PLCP Preamble, PLCP Header and 802.11MAC which are required to send an
802.11message.Besides, the amount of response frame is decreased and the message sending
rate is improved.
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