Clarion M10 Series Manual de usuario descargar pdf (Pagina 17)

C-SPEC CORPORATION WIRELESS PRODUCTS

CLARION MerLAN M10 15

busy is Off, then frames offered at the AUI port will be ignored, and the level-

4 transport protocol is responsible for re-initiating the frame transfer for each

such ignored frame; this will result in large delays due to the level-four-

transport time-out delay. If Collisions for busy is On, then the M10 will send

a collision indication for flow control via the Ethernet back-off algorithm.

When such collisions can be used, the (MAC-level) delay for re-initiating a

frame transfer will be small.

Filter Duplicates {On/Off} default = On. There will always be some non-

zero rate of lost frames over any RF link; some of these lost frames inevitably

will be ACKs in response to received frames. When this happens, the

retransmission protocol will cause some duplicated frames at the receiver. If

filter duplicates is enabled, this option will inhibit the download of a frame if

its sequence number matches the most-recently downloaded frame.

Download Error Frames {On/Off} default = Off. Sends frames failing

CRC to the AUI port anyway. This option is for diagnostic use only.

SUPPORTED NETWORK CONFIGURATIONS

The use of the MAC-level retransmission protocol combined with the single

RF Address for an M10 limits the configurations supported. The variations

considered are whether the retransmission protocol is used, and, if so,

whether the RF Address is checked for ACKing. The three possible

combinations, each with an explanation of the network topology supported,

are as follows:

Retransmit Off

Any network configuration can be used, e.g., multiple M10s, each possibly

connected to multiple Ethernet cards via 10baseT hubs, in a peer-to-peer

network. No RF Address assignment is required, or relevant. The

importance of MAC-level retranmissions because of the unavoidable loss of

RF frames makes this network less attractive in practice than those

supported by having retransmissions on.

Retransmit On, Address Check Off

Any point-to-point connection of a pair of M10s can be used, e.g.,

interbuilding bridging or routing, wireless connection of two 10baseT hubs,

etc. Because there can be only one receiving M10 at any instance, there is no

need for the RF Address. Care must be taken that the pair of M10s is on a

distinct code channel.

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Clarion M10 Series Manual de usuario Pagina 17