
Communication Layers' Attributes
Appendix D
D-13
MAC Layer
Parameter:
Description:
Default Value:
Maximum inter-solicit
count
How often the station opens response window.
40 (Hex) 64 (Decimal)
Slot time
Maximum time (in octets) the node will wait for a
response. All nodes on the network must have
the same slot time.
50 (Hex) 80 (Decimal)
Maximum PDU size
Maximum size of PDU.
1FEB (Hex) 8171 (Decimal)
Maximum non-RWR
retry limit
Maximum retries of a non-RWR message.
3 (Decimal)
In Ring Desired
When set to zero, the node will only "go online"
to transmit.
1
MAC-Layer Counters:
Description:
Successor
The source address of the node to which this node will pass the token.
Predecessor
The source address of the node which passed the token to this node.
Last token rotation time
A measure of the time in octets of the last complete token pass as seen by this
node.
Frame checksum errors
Number of IEEE 802.4 CRC errors.
Number of tokens heard
Number of detected tokens being passed.
Number of who follows
query
Number of times this station has had to look for a new successor.
Token pass failures
Number of times this station has failed to pass the token.
Number of successors
Number of times this station failed to find a successor.
Unexpected frames
A possible duplicate token situation.
Claim tokens
Number of claim tokens found.
Received frames too long
Number of frames this station has received that are greater than 8K bytes.
Modem errors
Number of local physical errors from modem.
E-Bit errors
Number of frames with checksum errors detected by a remodulator.
Non-silence
Number of non-silence periods received from modem.
Frame fragments
Number of frames seen with a start delimiter and no end delimiter.
Solicit Any
Number of times frame soliciting all potential successors has been sent.
MAC-Layer Actions:
Description:
Go off line
The node removes itself from the network.
Go on line
The node will attempt to enter the network on the next available opportunity.
Содержание PLC-5 MAP/OSI
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