User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 7-7

Diagnostics & Troubleshooting

Determining Performance and Status

 DS3 Far-End Statistics ... 7-7

 DS3 Path Maintenance Data Link ... 7-7

 Point-to-Point Protocol Status ... 7-8

DS3 Far-End Statistics

DS3 far-end statistics are available only when the Wide Bank 28 DS3 is configured for C-bit

framing.

The commands that display DS3 far-end statistics, in conformance with RFC 1407 DS3 MIB:

 hour ds3far – Provides hour statistics for the far-end DS3. Statistics are calculated for

Unavailable Seconds, Severely Errored Seconds, Errored Seconds, and Parity Error Count.

 day ds3far – Provides day statistics for the far-end DS3. Statistics are calculated for

Unavailable Seconds, Severely Errored Seconds, Errored Seconds, and Parity Error Count.

 status ds3far – Provides status information for the far-end DS3, including alarm conditions

and characteristic DS3 ID strings. The alarm code can be one of the 11 codes specified in

ANSI T1.107.

DS3 Path Maintenance Data Link

DS3 Path Maintenance Data Link is available only when the Wide Bank 28 DS3 is configured for

C-bit framing.

The Path Maintenance Data Link is a 28.2-kbps terminal-to-terminal data link embedded in the

C-bits. The signal format on this data link comprises messages using a link access procedure on the

D-channel (LAPD). The LAPD messages carry DS3 Path Identification, DS3 Idle Signal

Identification, and DS3 Test Signal Identification. The specific message formats are as defined in

ANSI T1.107. The DS3 Path Identification is the most common message and is sent when the DS3

is carrying traffic, the DS3 Idle Signal Identification is sent when an IDLE signal is sent, and the

DS3 Test Signal Identification is sent when a PRBS test signal is sent. The appropriate LAPD

message is sent at least once per second. Because these messages consume minimal bandwidth, the

unused bandwidth is available for proprietary messaging.

Functional Description of DS3 Path Maintenance Data Link

The three identification messages all contain the following information, which can be set using

the ds3 command:

 Equipment Identification Code – Describes a specific piece of equipment

 Location Identification Code – Describes a specific location