OSI PICS Manual

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ISO 8802-3 for TLAM

Tandem OSI PICS Manual–135046

3-6

D.1.5 MAC Frame Structure

D.1.5.4 Address Fields

D.1.5.5 Length Field

The implementation shall fill in the length field with two octets, giving the number of

octets in the LLC data field.

D.1.5.6 Data and Pad Fields

The implementation shall allow any arbitrary data pattern in the data field, up to the

maximum allowed packet length.

D.1.5.7 Frame Check Sequence (FCS) Field

The implementation shall use the generating polynomial:

G(χ) =χ

+χ

+χ+1

to append four octets of frame check sequence covering all fields except for the

preamble, start delimiter, and frame check sequence (see § 3.2.8).

Ref # Function

Standard

Clause

Standard

Type or

Range

COSSS

Clause

COSSS

Type or

Range Implemented?

1.5.4.1 16 bit addresses 3.2.3 o 6.4.4.1 x N

1.5.4.2 48 bit addresses 3.2.3 o 6.4.4.1 m Y

1.5.4.3 Individual address 3.2.3.1 m m Y

1.5.4.4 Multi-cast grp. addr. (2) 3.2.3.1 o o Y

1.5.4.5 Broadcast address 3.2.3.1 m m(1) Y

Note 1: The reception of a frame with a broadcast address is mandatory. Generation of frames with a broadcast

address is optional.

Note 2: A single Group MAC address is supported per port. Multi-cast is supported for ports with address

%H800 (normally #IP port) only. If Group MAC address is enabled for port type %H800, then Multi-cast

feature is disabled for that port.

Standard COSSS

Ref # Parameter Clause Type Range Type Range Implemented?

1.5.5.1 Length field 3.2.6 m 2 octets m 2 octets Y

1.5.5.2 Trans order 3.2.6 m mso 1st m mso 1st Y

mso = most significant octet

Standard COSSS

Ref # Parameter Clause Type Range Type Range Implemented?

1.5.6.1 Data field 3.2.7 m N octets m N octets Y

1.5.6.2 Pad bits 3.2.7 m Note 1 m Note 1 Y

Note 1: For a packet of LLC data length of n octets, the implementation shall append:

max (0, minFrameSize – ( 8n + 2 (addressSize) + 48 ))

pad bits to the data.