PAM Programming Manual

Link-Level Interfaces
PAM Programming Manual—142482
3-19
Header for LLC2 MAC Frames
zSDU-data
The first byte of data in the frame.
Header for LLC2 MAC Frames
The Ethernet SDU header format for LLC2 MAC frames is defined as follows:
The fields of SDU header for LLC1 MAC frames are defined as follows:
zSDU-Size
The number of bytes of buffer space required for this SDU.
zDest-MAC-Addr
The destination MAC address.
zSrc-MAC-Addr
The source MAC address.
zLength
The length of the frame as defined in the 802.3 Ethernet standard
zDSAP
The destination service access point (DSAP) address.
zSSAP
The source service access point (SSAP) address.
zCtrl1
The one-byte Control field defined for unnumbered LIF frames; for numbered
frames, this is the first byte of the two-byte LLC Control field.
def ZL2S-DDL-LLC2-SDU-Hdr.
02 zSDU-Size type ZSPI-DDL-INT.
02 zDest-Mac-addr type ZSPI-DDL-BYTE
occurs 6 times.
02 zSrc-MAC-addr type ZSPI-DDL-BYTE
occurs 6 times.
02 zLength type ZSPI-DDL-INT.
02 zDSAP type zSPI-DDL-BYTE.
02 zSSAP type ZSPI-DDL-BYTE.
02 zCtrl1 type ZSPI-DDL-BYTE.
02 zCtrl2 type ZSPI-DDL-BYTE.
end.