In this section:
Diagnostic Commands - Loopback Tests
Several types of loopbacks can be performed on the system T1 interfaces. The system also responds to network generated AT&T formatted loop up/down codes. Loopback codes sent from far-end equipment loop the T1 interfaces back towards the network.
On platforms that support E1, Remote Line and Remote Payload are not supported in E1 mode.
T1 loopback tests are described in the table below.
Loopback Tests
| Item | Description |
|---|---|
| Local | Tests the inward loopback so that the interface on the EdgeMarc can synchronize on the signal it is sending. Used to verify the proper operation of the T1 interface on the EdgeMarc. |
| Network line | Loops the data back towards the network before the framer chip in the EdgeMarc. |
| Network payload | Loops the data back towards the network at the T1 framer chip in the EdgeMarc. |
Remote line (AT&T or ANSI) | Sends an AT&T TR 62411 or ANSI T1.403 formatted in-band line loop code to the network. Generating this code causes the remote equipment to loop data back to the EdgeMarc. |
Remote payload (AT&T or ANSI)
| Sends an AT&T TR 62411 or ANSI T1.403 formatted in-band payload loop code to the network. Generating this code causes the remote equipment to loop data back to the EdgeMarc. |
| Submit | Implements or deactivates an existing loopback for a specific interface once the desired option is chosen from the Loopback drop-down list. |
T1 Status - Alarm Types
T1 Status shows the current alarm state and if there is a loopback or BERT test in progress. T1 alarm types are described in the table below.
Alarm Types
| Item | Description |
|---|---|
| Red Alarm | The EdgeMarcis not receiving a valid framing pattern from the network. Something is usually broken with the EdgeMarcreceiving path of the T1 line or with the sending equipment. |
| Yellow Alarm | The remote end (network side T1 interface) is not able to synchronize to the signal sent by the EdgeMarc. Something is usually broken with the EdgeMarctransmit path of the T1 line or with the receiving equipment. |
| Blue Alarm | The EdgeMarcis receiving an unframed all ones signal. This usually indicates a problem with the network side equipment. |
T1 Statistics - Diagnostic Counters
The system displays the current 15-minute (CUR) and 24-hour total (SUM) statistics for the T1 interfaces. These statistics provide an easy way to compare results from two different time frames for the network. The system also provides detailed statistics for each 15-minute interval over the last 24 hours on the T1 advanced diagnostics page. The oldest-15 minute interval is deleted from the 24-hour total as a new 15-minute interval is added.
On platforms that support E1, only the first 4 Counters are supported in E1 mode. Interval Data is not supported in E1 mode.
T1 diagnostic counters are described in the table below. For complete interval statistics, click the T1 Advanced Diagnostics link and refer to View Advanced T1 Diagnostics.
T1 Diagnostic Counters
| Counter Type | Description |
|---|---|
| Framing Errors | Incorrect or unexpected framing bit has been received. |
Code Violation Errors | Bipolar Violation (BPV) or excessive zero event. |
| CRC Errors | Received cyclical redundancy check (CRC) code does not match the code that was calculated locally. |
| Bit Errors | Number of bit errors during Bit Error Rate Tests (BERT)/QRBS test. |
Seconds Since Last
| Number of seconds since the last performance data event. Note: T1.403 and TR54016 standards allow for performance data via FDL. This is the number of seconds since the last receive of FDL performance data. |
ESF Error Events | CRC or out of frame event. |
| Current Status | Current status code. |
| Valid Intervals | Number of valid 15 minute intervals.
|
T1 Interval Data
T1 interval data is described in the table below. The Reset button resets the statistics in the current interval.
Interval Data
| Interval Data | Description |
|---|---|
| Errored (s) | Number of seconds with one or more Extended Superframe (ESF) Error events. |
| Unavailable (s) | Number of seconds during which the T1 interface is unavailable. |
Severely Errored (s) | Number of seconds with 320 or more ESF error events. |
Bursty Errored (s) | Number of seconds with more than one and fewer than 320 ESF error events. |
Loss of Frame (s) | Number of seconds during which an out of frame error is detected. |
Controlled Slip (s) | Number of seconds during which there have been one or more controlled slips. A controlled slip occurs when there is a difference between the timing of the EdgeMarc and the received T1 signal. |
Valid Intervals | Number of elapsed seconds in the current interval. |
| (s) w/ Actual Data | Number of seconds for which there is data. |
| Reset | Resets the statistics in the current interval. |
| Reset all stats | Resets all statistics in the current interval. |
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