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LANCOM L-32x Access Point series
Chapter 1: Introduction
19
EN
Block acknowledgement
Each data packet directed to a specific address (i.e. not broadcast or multicast
packets) is acknowledged immediately after receipt. In this way, the transmit-
ter is informed that the packet was received correctly and does not need to be
repeated. This principle also applies to aggregated frames in 802.11n.
Two different methods are used for frame aggregation. These are not explai-
ned in detail here, but they differ in the way aggregated frames are acknow-
ledged.
Mac Service Data Units Aggregation (MSDUA) combines several Ethernet
packets together to form one common wireless LAN packet. This packet is
acknowledged only once and the acknowledgment is valid for all aggre-
gated packets. If there is no acknowledgement the whole block is resent.
Mac Protocol Data Units Aggregation (MPDUA) combines individual wire-
less LAN packets together to form one large common wireless LAN packet.
In this case, each wireless LAN packet is acknowledged and the acknow-
ledgements are combined and transmitted as a block. In contrast to
MSDUA, the sender receives information about the receipt status of every
single WLAN packet and can, if necessary, resend only those specific
packets that were not successful.
1.3 What can your LANCOM do?
The following table shows the properties and functions of your device.
LANCOM
L-320agn
Wireless
LANCOM
L-321agn
Wireless
LANCOM
L-322agn
dual Wireless
Applications
Expansion of the LAN through WLAN (infrastructure
mode)
✔✔✔
WLAN via point-to-point
✔✔✔
Relais mode with two WLAN modules
Relais mode with one WLAN modules
(WDS mixed mode)
✔✔✔
Internet Access
✔✔✔
IP router with Stateful Inspection Firewall
✔✔✔
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