FL SWITCH MM HS
9-8
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6874_en_16
9.4.1
Control word
The control word is a special process data item used to make settings, which are not to be
executed via a conventional process data item.
The control word of the management agent can be described with a command consisting of
two bytes. The device responds to this with the same command in the status word. Byte 0
specifies the action and the new status; byte 1 specifies the port number. If a command is
to apply to all the ports, the value 0xFF can be sent instead of the port number. A command
should only be sent once, but never in a process data communication cycle.
9.4.1.1
Additional process data
The MMS/MCS can send the following process data:
–
Summary of the link states of all ports (three bytes) - each port corresponds to one bit
(0 - Link down; 1 - Link up)
–
The slots send link information for each port. This includes:
- Link status: (0 - Link down; 1 - Link up)
- Far End Fault status: (0 - No error; 1 - Error)
- Port enable status: (0 - Enabled; 1 - Disabled)
- Link mode: (0 - Forwarding; 1 - Blocking)
Table 9-1
Assignment of the control word
Action
Status
Byte 0
Byte 1
Link monitoring
On
0x01
Port or 0xFF
Off
0x02
Port or 0xFF
POF SCRJ diagnostics
On
0x03
Port or 0xFF
Off
0x04
Port or 0xFF
Power supply
On
0x05
0x00
Off
0x06
0x00
Interface removed
On
0x07
0x00
Off
0x08
0x00
MRP ring failure
On
0x09
0x00
Off
0x0a
0x00
Link enable status
On
0x20
Port
Off
0x21
Port
Byte
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Bit
7
6
5
4
3
2
1
0
Port
8/16/24
7/15/23
6/14/22
5/13/21
4/12/20
3/11/19
2/10/18
1/9/17
Bit
7
6
5
4
3
2
1
0
Meaning
Link mode
Port
enable
Far End
Fault
Link status
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