Acer HDS AMS200 Reference Manual page 326

Parameter:
In the link control frame, the parameter is used to transmit original information of the
individual link control frame and in the data frame, it is used for the relative offset.
Header
The presence of the Optional Headers is indicated by the DF_CTL field. The treatment of the
Optional Headers with the AMS200 is shown in Table D.7.
Table D.7 Frame Format
No. Name
1 Expiration
Security
Header
2 Network
Header
3 Association
Header
4 Device
Header
The AMS200 does not add Optional Headers in a Data frame to be sent to other N_Ports.
The host computer shall not add Optional Headers in a frame sent to the AMS200.
If the Optional Headers are added in the Data frames sent to the subsystem, correct
operation in the AMS200 is not guaranteed.
306 Appendix D Interfaces
Usage
Used to specify the expiration
time, etc. of the frame.
Used by a bridge or a gateway
node which interfaces to an
external Network.
Used to identify the process or
process group.
Used by the upper level protocol.
Treatment with the Disk Array
Ignores this header and processes the
command.
Ignores this header and processes the
command.
Ignores this header and processes the
command.
Ignores this header and processes the
command.
Remarks
16 bytes
16 bytes
32 bytes
16 bytes
32 bytes
64 bytes