This section describes the performance monitored parameters relevant to DS1 signals incoming from the fiber or DSX-1. DS1 signals and the monitored parameters for these signals are supported when Alcatel-Lucent 1850 TSS-5 is equipped with a VLNC2 and VLNC50/52/55 circuit packs.
Performance is monitored by observing the number of errors or violations that occur for line or path parameters. This information is accumulated and stored the current 15-minute and 24-hour registers. A second 24-hour register maintains the number of errors recorded during the previous 24 hours. The number of errors accumulated during the previous 8 hours are maintained in 31 additional 15-minute registers.
Thresholds can be set for the number of errors or violations that occur for line or path parameters in a 15 minute or 24 hour period. When a 15 minute or 24 hour threshold is exceeded, or crossed, a Threshold Crossing Alert (TCA) occurs.
Threshold crossing alerts are clearly identified and the time the performance registers were last initialized is also shown. Any registers that may have been affected by this initialization are marked. There are separate reports for section, line, and path parameters, as well as Ethernet parameters.
Line and path TCA reporting may be enabled or disabled using the TL1 TCAMD parameter, or through the GUI interface provided by CIT software. Threshold reporting is provisionable, individually, at the port, line, or path level, and for Ethernet interfaces.
Tariffed service verification consists of monitoring performance parameters that can be associated with the customer's end-to-end service. Based on ANSI T1.403 extended superframe format (ESF), this capability retrieves performance messages written into the ESF data link by the customer's terminal equipment. From these messages, Alcatel-Lucent 1850 TSS-5 can determine and report the end-to-end error performance of the entire DS1 link as seen by the customer. The counts are retrieved by the message-based operations system to determine if the service is operating within tariffed limits.
Each DS1 circuit pack measures the near-end performance of the incoming DS1 signals, allowing the service provider to determine if a good DS1 signal was received from the customer before transporting it through the network. This information can then aid in localizing any reported performance problems. The DS1 circuit packs can also provide this same near-end information for super frame (SF) formatted (sometimes known as D4 framing) DS1 services, but complete end-to-end performance verification is limited due to the lack of the PRM in the SF format.
The following table lists the DS1 line and path performance parameters that Alcatel-Lucent 1850 TSS-5 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 1 |
Default |
Range 1 | ||
|
DS1 Line |
Errored Seconds (ES-L) |
65 |
0–900 |
648 |
0–65535 |
|
DS1 Path |
Coding Violations (fmt=SF) (CV-P) |
72 |
0–16383 |
691 |
0–1048575 |
|
Coding Violations (fmt=ESF) (CV-P) Coding Violations Far End (CV-PFE) |
13296 |
0–16383 |
132960 |
0–1048575 | |
|
Errored Seconds (ES-P) Errored Seconds Far End (ES-PFE) |
65 |
0–900 |
648 |
0–65535 | |
|
DS1 Path |
Severely Errored Seconds (SES-P) Severely Errored Seconds Far End (SES-PFE) |
10 |
0–900 |
100 |
0–65535 |
|
Unavailable Seconds (UAS-P) Unavailable Seconds Far End (UAS-PFE) |
10 |
0–900 |
10 |
0–65535 | |
|
SE Frame/Alarm Indication Signal Seconds (SAS-P) SE Frame Seconds Far End (SEFS-PFE) |
2 |
0–900 |
17 |
0–65535 | |
When an individual performance monitoring parameter threshold is provisioned as zero (0), TCA reporting for the affected parameter is disabled.
Alcatel-Lucent 1850 TSS-5 monitors the following near end DS1 line parameter on incoming (from the DSX-1 cross-connect) DS1 signals. The parameter is measured at the input of the DS1 circuit pack on the DS1 line side (also referred to as facility, customer terminal, or DSX side).
The near end ES-L parameter increments once for each second during which Alcatel-Lucent 1850 TSS-5 detects either one or more bipolar violations (BPVs) or excessive zeros (EXZ), or one or more LOS defects.
Use the Performance → View PM Reports → DS1 Line command to obtain the DS1 Line PM Report. Near end DS1 line PM is reported with an AID of the DS1 interface and a modifier of T1.
Alcatel-Lucent 1850 TSS-5 monitors the following near end DS1 path parameters at the local network element. The parameters are measured at the input of the local DS1 circuit pack on the DS1 line side (also referred to as facility, customer terminal, or DSX side).
For the SF format, the CV-P parameter increments once for each frame synchronization bit error (FE) detected at the path level. For the ESF format, the CV-P parameter increments once for each cyclic redundancy check error (CRC) detected at the path level.
For the SF format, he ES-P parameter increments once for each second during which Alcatel-Lucent 1850 TSS-5 detects FE errors, CS events, SEF defects, or AIS defects. For the ESF format, the ES-P parameter increments once for each second during which Alcatel-Lucent 1850 TSS-5 detects CRC errors, CS events, SEF defects, or AIS defects.
For the SF format, the SES-P parameter increments once for each second during which Alcatel-Lucent 1850 TSS-5 detects 8 or more FE events (if Ft and Fs bits are measured) or 4 or more FE events (if only Ft bits are monitored), or SEF defects, or AIS defects.
A 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 SAS-P parameter increments once for each second during which Alcatel-Lucent 1850 TSS-5 detects either one or more severely errored frame defects, or one or more AIS defects. The SAS-P parameter applies to SF and ESF frame formats.
Use the Performance → View PM Reports → DS1 Line command to obtain the DS1 Path PM Report. Near end DS1 path PM is reported with an AID of the DS1 interface and a modifier of T1.
Alcatel-Lucent 1850 TSS-5 monitors the following far end DS1 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 Performance Report Message (PRM) frames or a Remote Alarm Indication (RAI) signal.
The far end parameters are measured at the input of the local DS1 circuit pack on the DS1 line side (also referred to as facility, customer terminal, or DSX side).
Important!
The format must be set to ESF to monitor the far end parameters (CV-PFE, ES-PFE, SES-PFE, and UAS-PFE).
The CV-PFE parameter increments based on the PRM G bits defined in the following table.
|
PRM Bit = 1 |
CV Count Accumulated |
|---|---|
|
G1 |
1 |
|
G2 |
5 |
|
G3 |
10 |
|
G4 |
100 |
|
G5 |
319 |
|
G6 |
333 |
The ES-PFE parameter is a count of one second PRM intervals containing an RAI or RAI-CI signal, or a 1 in any of the following bits: G1, G2, G3, G4, G5, G6, SE, or SL.
The SES-PFE parameter is a count of one second PRM intervals containing an RAI or RAI-CI signal or a 1 in any of the following bits: G6 or SE.
A UAS-PFE 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 SEFS-PFE parameter is a count of 1 second PRM intervals that SE bit is equal to 1.
Use the Performance → View PM Reports → DS1 Line command to obtain the DS1 Path PM Report. Far end DS1 path PM is reported with an AID of the DS1 interface and a modifier of T1.
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