This section describes the performance monitoring parameters that are monitored on DS3 signals incoming from the high speed fiber and from the local DSX-3 cross-connect.
In order to generate DS3 PM reports, the port Primary State must be IS (in service). (When the PST parameter is provisioned as AUTO and a valid DS3 signal is detected, the PST parameter automatically transitions to the IS state.) The VM mode should be off because the P-bits can be corrected at nodes where the VM Mode is provisioned on, and the DS3 P-bit PM data may not provide a complete report of the end-to-end DS3 path errors.
The following table lists the DS3 line and path performance parameters that Alcatel-Lucent 1665 DMX monitors, including the default and ranges for the 15-minute and 1-day (24-hour) registers.
|
Facility |
Measured Provisionable Parameter |
15-Min |
1-Day | ||
|---|---|---|---|---|---|
|
Default |
Range 2 |
Default |
Range 2 | ||
|
DS3 Line |
Coding Violations (CV-L) |
387 |
0–16383 |
3865 |
0–1048575 |
|
Errored Seconds (ES-L) |
25 |
0–900 |
250 |
0–65535 | |
|
Severely Errored Seconds (SES-L) |
4 |
0–900 |
40 |
0–65535 | |
|
DS3 Path |
Coding Violations (CV-P) (CV-P-EGR) 1 Coding Violations Far End (CV-PFE) (CV-PFE-EGR) 1 |
382 |
0–16383 |
3820 |
0–1048575 |
|
Errored Seconds (ES-P) (ES-P-EGR) 1 Errored Seconds Far End (ES-PFE) (ES-PFE-EGR) 1 |
25 |
0–900 |
250 |
0–65535 | |
|
Severely Errored Seconds (SES-P) (SES-P-EGR) 1 Severely Errored Seconds Far End (SES-PFE) (SES-PFE-EGR) 1 |
4 |
0–900 |
40 |
0–65535 | |
|
Unavailable Seconds (UAS-P) (UAS-P-EGR) Unavailable Seconds Far End (UAS-PFE) (UAS-PFE-EGR) 1 |
10 |
0–900 |
10 |
0–65535 | |
|
SE Frame/Alarm Indication Signal Seconds (SAS-P) (SAS-P-EGR) 1 SE Frame/Alarm Indication Signal Seconds Far End (SAS-PFE) (SAS-PFE-EGR) 1 |
2 |
0–900 |
8 |
0–65535 | |
Egress parameters are reported using the -EGR suffix. Threshold provisioning is common. There are no separate thresholds for the egress parameters.
When an individual performance monitoring parameter threshold is provisioned as zero (0), TCA reporting for the affected parameter is disabled.
Alcatel-Lucent 1665 DMX monitors the following ingress near end DS3 line parameters on incoming (from the DSX-3 cross-connect) DS3 signals. Ingress refers to performance monitoring parameters that are measured at the input of the DS3 or TMUX circuit pack on the DS3 line side (also referred to as facility, customer terminal, or DSX side).
Alcatel-Lucent 1665 DMX supports DS3 line performance monitoring on DS3 signals with P-bit parity, FM-bit parity, or CP-bit parity performance monitoring signal formats.
The near end CV-L parameter increments once for each bipolar violation (BPV) and excessive zeros (EXZ) detected at the DS3 line layer.
The near end ES-L parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects either one or more bipolar violations (BPVs) or excessive zeros (EXZ), or one or more LOS defects.
The near end SES-L parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects either one or more LOS defects, 2444 or more BPVs at a minimum BER of 7.5 X 10-5, or 45 or more BPVs at a minimum BER of 1 X 10-6.
Use the Performance → Reports → DS3 Line command to obtain the DS3 Line PM Report. Ingress near end DS3 line PM is reported with an AID of the DS3 or TMUX interface and a modifier of T3. For more information about the DS3 line parameters and the Performance → Reports → DS3 Line command, see the WaveStar® CIT online help.
Alcatel-Lucent 1665 DMX supports the following DS3 path performance monitoring signal formats:
P-bit parity: The P bits are monitored for detecting code violations at the near end.
FM-bit parity: The F and M bits are monitored for detecting code violations at the near end.
CP-bit parity: CP-bit parity is used for end-to-end DS3 path PM (near end and far end). The C bits are monitored for code violations. CP-bit parity is only allowed on DS3 signals with the C-bit signal format.
When provisioned for P-bit parity, Alcatel-Lucent 1665 DMX calculates and provides counts of the following near end DS3 path parameters incoming from the fiber or DSX-3:
FM-bit parity provides an alternative method for determining and accumulating DS3 path performance data based on an error estimation technique using errors on the F&M framing bits to approximate the actual error counts in the DS3 path payload.
Adjusted F&M bit performance monitoring estimates the following near end DS3 path parameters incoming from the fiber or DSX-3:
When provisioned for CP-bit parity, Alcatel-Lucent 1665 DMX calculates and provides counts of the following DS3 near end and far end path parameters incoming from the fiber or DSX-3:
Severely errored frame/alarm indication signal seconds (SAS-P)
Severely errored frame/alarm indication signal seconds Far End (SAS-PFE)
The DS3 path performance monitoring signal formats support provisionable P-bit monitoring and correction (violation monitoring mode) on the outgoing DS3 signal toward the DS3 facility.
The following table shows the provisionable DS3 signal formats, performance monitoring signal formats, and VM modes.
|
DS3 Signal Format |
Performance Monitoring Signal Format |
VM Mode |
Monitor P-Bits |
Correct P-Bits |
|---|---|---|---|---|
|
C-Bit |
P-bit parity |
On |
X |
X |
|
On |
X |
|||
|
FM-bit parity |
On |
X | ||
|
On |
||||
|
CP-bit parity |
On |
X | ||
|
On |
Alcatel-Lucent 1665 DMX monitors the following ingress and egress near end DS3 path parameters at the local network element. Ingress refers to parameters that are measured on incoming DS3 signals at the input of the local DS3 or TMUX circuit pack on the DS3 line side (also referred to as facility, customer terminal, or DSX side). Egress refers to parameters that are measured on incoming DS3 signals at the input of the local DS3 port unit on the SONET side (also referred to as fiber side).
The near end CV-P parameter increments once for each parity error detected at the path level. The CV-P parameter applies to all performance monitoring signal formats.
In the P-bit parity signal format, P-bit errors corresponding to the same DS3 M-frame also increment the CV-P parameter.
For CP-bit parity signal format, the three C-bits in subframe 3 of a C-bit formatted DS3 frame carry the DS3 path-parity information. At the DS3 transmitter, the CP bits in the DS3 C-bit frame are set equal to the two P-bits in frame "n". These CP bits are then inserted into frame "n+1". Since the CP bits are not modified in any way while passing through the network, the DS3 high-speed receiver can determine if errors occurred in the DS3 path. The DS3 receiver computes the parity of frame "n" and compares that parity with the value received in the CP bits in frame "n+1". If the values do not match, DS3 path parity violations are counted.
The near end ES-P parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects either one or more parity errors, one or more SEF defects, or one or more AIS defects. The ES-P parameter applies to all performance monitoring signal formats.
The near end SES-P parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects either one or more AIS or SEF defects, 2444 or more BPVs at a minimum BER of 7.5 X 10-5, or 45 or more BPVs at a minimum BER of 1 X 10-6. The SES-P parameter applies to all performance monitoring signal formats.
A near end UAS-P is a second during which the path is unavailable. A path is considered unavailable from the beginning of 10 consecutive severely errored seconds until the beginning of 10 consecutive seconds, none of which are severely errored. The UAS-P parameter applies to the P-bit parity and FM-bit parity performance monitoring signal formats.
The SAS-P parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects either one or more severely errored frame defects, or one or more AIS defects. The SAS-P parameter applies to all performance monitoring signal formats.
Use the Performance → Reports → DS3 Path command to obtain the DS3 Path PM Report. Ingress near end DS3 path PM is reported with an AID of the DS3 or TMUX interface and a modifier of T3. Egress near end DS3 path PM is reported with an AID of the SONET interface and a modifier of T3. For more information about the DS3 path parameters and the Performance → Reports → DS3 Path command, see the WaveStar® CIT online help.
Alcatel-Lucent 1665 DMX monitors the following ingress and egress far end DS3 path parameters at the local network element. If the far end network element detects an incoming error, the far end network element communicates the error back to the local near end network element using far end block error (FEBE) bits in the DS3 path overhead. (This allows the local near end Alcatel-Lucent 1665 DMX to perform the PM accumulation, storage, threshold, and reporting functions for both the near end and far end.)
Ingress refers to far end parameters that are measured at the input of the local DS3 or TMUX circuit pack on the DS3 line side (also referred to as facility, customer terminal, or DSX side). Egress refers to far end parameters that are measured at the input of the local DS3 port unit on the SONET side (also referred to as fiber side).
Important!
The DS3 signal format must be provisioned for C-Bit and the performance monitoring signal format must be provisioned for CP-Bit Parity to monitor the far-end parameters.
The CV-PFE parameter increments as reported by the FEBE indication in the line overhead. At the far end if an incoming DS3 path error (for example, C-bit, F-bit, or M-bit error) is detected, an error indication is communicated back to the near end equipment by using the far end block error (FEBE) bits.
The FEBE message sent back from the far end is set to "111" if no path errors are detected. If a path error is detected, the FEBE message is set to "not 111." The FEBE monitor parameter (CV-PFE) increments once for each occurrence of a received "not all ones" pattern in the received FEBE message.
The ES-PFE parameter increments once for each second containing one or more M-frames with the three FEBE bits not all set to ONE or one or more far-end SEF or one or more far-end AIS defects.
The SES-PFE parameter increments once for each second where 2444 or more FEBE errors at a minimum BER of 7.5 X 10-5, or 45 or more FEBE errors at a minimum BER of 1 X 10-6 are detected as reported by the FEBE indication of the path overhead or one or more far-end SEF or one or more far-end AIS defects are detected.
The UAS-PFE parameter is a count of 1 second intervals for which the DS3 path is unavailable at the onset of 10 contiguous SES-PFEs. The 10 SES-PFEs are included in the unavailable time. Once unavailable, the UAS-PFE continues to increment once for each second until ten consecutive seconds without SES-PFE are detected. The 10 seconds without SES-PFEs are excluded from the unavailable time.
The SAS-PFE parameter increments once for each second where one or more far end severely errored frame defects, or one or more far end AIS defects are detected.
Use the Performance → Reports → DS3 Path command to obtain the DS3 Path PM Report. Ingress far end DS3 path PM is reported with an AID of the DS3 or TMUX interface and a modifier of T3. Egress far end DS3 path PM is reported with an AID of the SONET interface and a modifier of T3. For more information about the DS3 path parameters and the Performance → Reports → DS3 Path command, see the WaveStar® CIT online help.
| November 2011 | Copyright © 2011 Alcatel-Lucent. All rights reserved. |