Moxa AWK-6222-EU-T [94/101] Beacon

AWK-6222 User’s Manual References

6-2

Beacon

A beacon is a packet broadcast by the AP to keep the network synchronized. A beacon includes the

wireless LAN service area, the AP address, the Broadcast destination address, a time stamp,

Delivery Traffic Indicator Maps (DTIM), and the Traffic Indicator Message (TIM). Beacon

Interval indicates the frequency interval of AP.

DTIM

Delivery Traffic Indication Map (DTIM) is contained in beacon frames. It indicates that broadcast

and multicast frames buffered by the AP will be delivered shortly. Lower settings result in more

efficient networking, while preventing your PC from dropping into power-saving sleep mode.

Higher settings allow your PC to enter sleep mode, thus saving power.

Fragment

A lower setting means smaller packets, which will create more packets for each transmission. If

you have decreased this value and experience high packet error rates, you can increase it again, but

it will likely decrease overall network performance. Only minor modifications of this value are

recommended.

RTS Threshold

RTS Threshold (256-2346) – This setting determines how large a packet can be before the Access

Point coordinates transmission and reception to ensure efficient communication. This value should

remain at its default setting of 2,346. When you encounter inconsistent data flow, only minor

modifications are recommended.

STP and RSTP

The STP/RSTP Concept

Spanning Tree Protocol (STP) was designed to help reduce link failures in a network, and

provide protection from loops. Networks that have a complicated architecture are prone to

broadcast storms caused by unintended loops in the network. The STP protocol is part of the

IEEE802.1D standard, 1998 Edition bridge specification.

Rapid Spanning Tree Protocol (RSTP) implements the Spanning Tree Algorithm and Protocol

defined by IEEE802.1w-2001 standard. RSTP provides the following benefits:

y The topology of a bridged network will be determined much more quickly compared to STP.

y RSTP is backward compatible with STP, making it relatively easy to deploy. For example:

 Defaults to sending 802.1D-style BPDUs if packets with this format are received.

 STP (802.1D) and RSTP (802.1w) can operate on the LAN ports and WLAN ports (AP

and WDS1-WDS8) of the same AWK-6222.

This feature is particularly helpful when the AWK-6222 connects to older equipment, such as

legacy switches.