T1 loopback plug how to#
T1 loopback plug serial#
T1 loopback plug software#

Insert an external loopback cable into the port. Line Code Violations and an Increase in Line Errored SecsĮnsure that the equipment on the remote end of the 75 ohms coaxial cable sends a T3 signal with B3ZS line code.Ĭheck the 75 ohms coaxial cable integrity by looking for breaks or other physical abnormalities in the cable.

T1 loopback plug how to#

This section describes various error events that occur on T3 lines, and provides information on how to fix them. The counters in this data block are cleared every 24 hours (96 intervals). 15 minute intervals): Summary statistics for T3 signal quality for 15-minute intervals. This gauge is not incremented when UASs are counted. This gauge is not incremented when UASs are counted.Ĭ-bit Severely Errored Secs: Number of seconds with 44 or more CCVs, one or more Out-of-Frame defects, or a detected incoming AIS. Line Errored Secs: The number of one-second intervals in which a Line Code Violation occurred.Ĭ-bit Errored Secs: Number of seconds with one or more CCV, one or more Out-of-Frame defects, or a detected incoming AIS. Unavailable Secs (UAS): The number of one-second intervals in which the controller was down.

Severely Err Framing Secs: The number of one-second intervals in which either a Remote Alarm Indication was received, or a Loss Of Frame condition occurred. P-bit Severely Err Secs (PSES): A second with 44 or more PCVs, one or more Out-of-Frame defects, or a detected incoming AIS. For C-bit parity, it is the count of CP-bit parity errors that occur in the accumulation interval.

P-bit Err Secs (PES): A second with one or more PCVs, one or more Out-of-Frame defects, or a detected incoming Alarm Indication Signal (AIS).Ĭ-bit Coding Violation (CCV): The number of coding violations reported through the C-bits. Line Code Violations (LCV): The number of Bipolar Violations (BPV) received in the bipolar with three-zero substitution (B3ZS) line code. Regardless of which port adapter is used, T3 error events are defined as follows: PA-MC-T3: show controllers T3 dodi# show controllers T3 4/0ĭata in current interval (81 seconds elapsed):Ġ P-bit Err Secs, 0 P-bit Severely Err SecsĠ Severely Err Framing Secs, 0 Unavailable SecsĠ Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Severely Errored

T1 loopback plug serial#

PA-T3: show controllers serial dodi# show controllers serial 5/0ĭata in current interval (798 seconds elapsed):Ġ Line Code Violations, 0 P-bit Coding ViolationĠ Sev Err Framing Secs, 0 Unavailable SecsĠ Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs

T1 loopback plug software#

Identify the Error Eventīased on the type of port adapter used, Cisco IOS® Software commands display T3 error events. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. The document also includes a section on Hard Plug Loopback Tests. This document describes various T3 error events, and explains how to identify and troubleshoot them.