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Cisco IOSSoftware Configurationforthe Cisco12000Series One-PortChannelized OC-12/STM-4(DS1/E1)ISE Line

How to Configure Layer 1 Features

Cisco IOS Release 12.0(27)S1

Step 9

overhead c2

number

Example:

Router(config-controller)# au-4 1 overhead c2

Router(config-controller)# au-3 3

Router(config-ctrlr-au3)# overhead c2 98

Router(config-controller)# sts-1

Router(config-ctrlr-sts1)# overhead c2 98

(Optional). Legal values are 0 to 255. Defaults are as

follows:

• 02 for vt15, c11, and c12

• 04 for ct3

The Signal Label field is configured at the path level

configuration mode.

The Path Signal Label field occupies one byte (C2) of the

SONET STS Path overhead, and the SDH High Order Path

overhead. This byte indicates the type of contents carried in

the SONET Synchronous Payload Envelope (SPE), or SDH

High Order Virtual Container (HOVC). Setting the Path

Signal Label affects both the Transmitted (sent) value and

the Expected value of the C2 overhead byte.

Step 10

overhead j1 length [16 | 64]

overhead j1 message

Example:J1 configuration for SDH AU-4 mode

Router(config-controller)# au-4 1 overhead j1 length 16

Router(config-controller)# au-4 1 overhead j1 message

metro_SF

Example:J1 configuration for SDH AU-3 mode

Router(config-controller)# au-3 3

Router(config-ctrlr-au3)# overhead j1 length 16

Router(config-ctrlr-au3)# overhead j1 message

metro_LA

Example:J1 Configuration for SONET STS-1 mode

Router(config-ctrlr-sts1)# overhead j1 length 64

Router(config-ctrlr-sts1)# overhead j1 message

metro_washington gsr_0057/4/3

(Optional). The Path Trace identifier consists of two

configuration settings, the message length and the message

text.

The default message length is 16 for SDH framing, and 64

for SONET framing.

If you select a message length of 16, the actual message

length can be up to 15 characters. An additional byte,

prepended to the message, contains the result of a CRC7

calculated on the message. If the actual message text is

fewer than 15 characters, the message text is padded to its

full length with NULL characters.

If you select a message length of 64 and the actual message

text is fewer than 62 characters, the message text is padded

with NULL characters. The last two byte positions, 63 and

64, are always CR/LF (0x0D/0x0A).

The STS/High Order Path Trace Identifier (J1) is a

maintenance feature of SONETand SDH.

One byte (J1) of the Path overhead associated with each

path in the SONET/SDH frame is used to carry information

identifying the originating Path Terminating Equipment

(PTE).

In SDH with AU-4 mapping, the Path Trace identifier is

configured at the controller level. In SDH with AU-3

mapping or in SONET framing, the Path Trace identifier is

configured at the path level.

Command or Action Purpose

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