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Frame Format
6-2
6.1 Frame Format
The following describes the configuration of the data units which ThunderLAN
transmits and receives. ThunderLAN looks for this format to create the linked
structures it uses in transmitting and receiving data (see subsection 6.2, GO
Command).
6.1.1 Receive (Rx) Frame Format
The adapter receive channels are used to receive frames from other nodes on
the network. The ThunderLAN adapter allows received frame data to be frag-
mented into up to ten pieces. However, the adapter provides the data in a con-
sistent, logical format as shown below. This logical format is different for token
ring and Ethernet frame formats.
Figure 6–1. Token Ring Logical Frame Format (Rx)
18 bytes (max)
6 bytes
6 bytes
1 byte
1 byte
Data
Routing field (optional)
Source address
Destination address
FC
AC
Figure 6–2. Ethernet Logical Frame Format (Rx)
3 to 4 bytes
2 bytes
6 bytes
6 bytes
Data
LLC_header (optional)
Length/type
Source address
Destination address