Specifications

CP143 H1 / TCP/IP manual Software
Rev. 00/07 5-51
Ethernet address (Adr)
The ethernet address identifies a station. The ethernet address of the station must be unique
within the network.
The structure of the ethernet address is as follows:
The ethernet address consists of 6 bytes. The first three bytes are specific to the
manufacturer. These bytes are allocated by the IEEE-committee. The remaining three bytes
are supplied by the end-user. The allocation of ethernet addresses are the responsibility of
the systems network administrator.
Broadcast-messages do not require the use of an ethernet address.
Transport Service Access Point (TSAP)
Under H1 the TSAPs are used to establish communication channels for a connection. The
length of a TSAP is 8 bytes. TSAPs must always be specified (even for broadcast messages).
To simplify matters you may assign the same identifier to the external and the local TSAP.
Local TSAP
This is the TSAP of your own (local) station.
External TSAP
This is the TSAP of the destination station (external station).