CISCO IOS in a Nutshell

Name

fddi cmt-signal-bits — interface

Synopsis

fddi cmt-signal-bits signal-bits [phy-a | phy-b]
no fddi cmt-signal-bits signal-bits [phy-a | phy-b]

Configures

CMT transmission bits

Default

None

Description

This command sets the bits to be transmitted during the signal phase of CMT. Changing these values is not recommended and should be done only to debug specific CMT problems. signal-bits is the hexadecimal value of the bit fields you wish to set. phy-a and phy-b select the physical sublayer, either a or b. Table 15-8 describes the bit fields.

Table 15-8. Bit values for CMT signals

Bit position	Meaning
0	Escape bit
1-2	Physical type
3	Physical compatibility
4-5	Link confidence test duration
6	MAC for link confidence test
7	Link confidence test failed
8	MAC for local loop
9	MAC on physical output