PAM Programming Manual

Link-Level Interfaces
PAM Programming Manual—142482
3-31
Additional Header for Token Ring
AC
Access control.
FC
Function control.
zDest-MAC
The destination MAC address.
zSrc-MAC
The source MAC address. If the most significant bit of byte 0 is 1, then routing
information is present in the inbound SDU.
Route
Routing information
zDSAP
The destination service access point (DSAP) address:
zSSAP
The source service access point (SSAP) address:
LLC-Unnum
The LLC control field for unnumbered LLC frames. The LLC field is as
follows:
zCtrl
The Link Level Control, Type 1 (LLC1) control field for LLC1 frames.
zData
The first byte of data in the frame.
LLC-num
The LLC control field for Numbered LLC frames. The LLC control field is as
follows:
zCtrl1
The Link Level Control, Type 1 (LLC1) control field for LLC1 frames or
LLC2 control for LLC2 frames.
zCtrl2
The Link Level Control, Type 2 (LLC2) control field for LLC2 frames.