Cisco 10000 Series Configuration Manual page 271

Chapter 13 1-Port OC-12 Packet over SONET Line Card Configuration
Where:
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•
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The default values are c2—0xCF, j0—0x01, and s1s0—0.
Use the no form of the command to restore the default values.
In the following example, the c2 bit is set to 0xCF.
Router(config)# interface pos 5/0/0
Router(config-if)# pos flag c2 0xCF
Controlling the S1 SONET Overhead Byte
In most situations, the default value for the S1 SONET overhead byte (0x0) does not need to be changed.
Refer to the SONET standards for information about the possible values for the S1 SONET overhead
byte and the definition of each value.
Controlling a Transmitted S1 Overhead Byte
In Cisco IOS Release 12.2(28)SB, use the pos flag s1-byte tx command in interface configuration mode
to control the transmission of the S1 SONET overhead byte.
pos flag s1-byte tx value
Where:
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•
In the following example the S1 SONET overhead byte is set to 0xF:
pos flag s1-byte tx 0xF
Reacting to a Received S1 Overhead Byte
In Cisco IOS Release 12.2(28)SB, use the pos flag s1-byte rx-communicate command to direct the
router to switch the clock source to internal when it receives an S1 SONET overhead byte with a value
of 0xF. When the S1 SONET overhead byte changes from 0xF to any other value, the clock source reverts
back to the clock source specified in the user configuration.
The S1 overhead byte is ignored by the receiving router unless the pos flag s1-byte rx-communicate
command is issued.
pos flag s1-byte rx-communicate
no pos flag s1-byte rx-communicate
OL-8834-04
c2 is a path signal identifier, and value is one of the following:
0xCF for PPP or HDLC without scrambling
–
– 0x16 for PPP or HDLC with scrambling
j0 is the section trace byte, and value is 0x1 for interoperability with some SDH devices in Japan
s1s0 is part of the payload pointer byte, and value is 0 for OC-12c and 2 for AU-4
value is in the range of 0x0 to 0xF
0x0 is the default value
Cisco 10000 Series Router Line Card Configuaration Guide
Other Configuration Commands
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