DS1 performance monitoring parameters

Overview

This section describes the performance monitoring parameters relevant to DS1 signals incoming from the fiber or DSX-1.

DS1 ESF format

Tariffed service verification consists of monitoring performance parameters that can be associated with the customer's end-to-end service. Alcatel-Lucent 1665 DMX provides this capability for DS1 services when equipped with 28DS1 circuit packs with the DS1 performance monitoring feature (28DS1PM [LNW7]) and the high density LNW8/LNW801 56DS1/E1 circuit pack. 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 1665 DMX 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.

DS1 SF format

Each 28DS1PM and 56DS1/E1 circuit packs measure 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 isolating any reported performance problems. The 28DS1PM and 56DS1/E1 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.

Monitored parameters

The following table lists the DS1 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.

Table 5-9: DS1 performance parameters

Facility	Measured Provisionable Parameter	15-Min		1-Day
Facility	Measured Provisionable Parameter	Default	Range²	Default	Range²
DS1 Line	Errored Seconds-Line, Line Far End (ES-L, ES-LFE	65	0–900	648	0–65535
	Coding Violations (fmt=ESF) (CV-L)	13340	0–16383	133400	0–1048575
	Severely Errored Seconds (SES-L)	65	0–900	648	0–65535
DS1 Path	Coding Violations (fmt=SF) (CV-P) (CV-P-EGR)¹	13296	0–16383	132960	0–1048575
	Coding Violations (fmt=ESF) (CV-P) (CV-P-EGR)¹	65	0–900	648	0–65535
	Errored Seconds (ES-P) (ES-P-EGR)¹ Errored Seconds Far End (ES-PFE) (ES-PFE-EGR)¹	65	0–900	648	0–65535
	Severely Errored Seconds (SES-P) (SES-P-EGR)¹ Severely Errored Seconds Far End (SES-PFE) (SES-PFE-EGR)¹	10	0–900	100	0–65535
	Unavailable Seconds (UAS-P) (UAS-P-EGR)¹ Unavailable Seconds Far End (UAS-PFE) (UAS-PFE-EGR)¹	10	0–900	10	0–65535
	Severely Errored Frame/Alarm Indication Signal Seconds (SAS-P) (SAS-P-EGR)¹ Severely Errored Frame Seconds Far End (SEFS-PFE) (SESFS-PFE-EGR)¹	2	0–900	17	0–65535

Notes:

Egress parameters are reported for the LNW20 in portless mode 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.

DS1 line parameters

Alcatel-Lucent 1665 DMX monitors the 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).

Coding violations (CV-L)

The Near-End Line Coding Violation (CVL) parameter for each SONET Line is monitored. The Near-End CVL parameter increments once for every occurrence of a BIP error detected at the Line layer (i.e. using the B2 byte in the incoming SONET signal). Up to 8*N BIP errors can be detected per STS-N frame.

Errored seconds (ES-L)

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.

Severely errored seconds (SES-L)

The Near-End Line Severely Errored Seconds (SESL) parameter for each SONET Line is monitored. The Near-End SESL parameter increments once for every second that contains at least K BIP errors detected at the Line layer (at any point during the second), or an AIS-L defect was present. The value of K is hard-coded, see table 7 for a list of the values

DS1 line PM report

Use the Performance → 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. For more information about the DS1 line parameter and the Performance → Reports → DS1 line command, see the WaveStar^® CIT online help.

Near end DS1 path parameters

Alcatel-Lucent 1665 DMX monitors the following near end DS1 path parameters at the local network element. The parameters are measured at the input of the local DS1 or TMUX circuit pack on the DS1 line side (also referred to as facility, customer terminal, or DSX side).

Coding violations (CV-P)

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.

Errored seconds (ES-P)

For the SF format, he ES-P parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects FE errors, CS events, SEF defects, or AIS defects. For the ESF format, he ES-P parameter increments once for each second during which Alcatel-Lucent 1665 DMX detects CRC errors, CS events, SEF defects, or AIS defects.

Severely errored seconds (SES-P)

For the SF format, the SES-P parameter increments once for each second during which Alcatel-Lucent 1665 DMX 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.

Unavailable seconds (UAS-P)

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.

Severely errored frame/alarm indication signal seconds (SAS-P)

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 SF and ESF frame formats.

Near end DS1 path PM report

Use the Performance → Reports → DS1 path command to obtain the DS1 Path PM Report. Near end DS1 path PM is reported with an AID of the DS1 or TMUX interface and a modifier of T1. For more information about the DS1 path parameters and the Performance → Reports → DS1 path command, see the WaveStar^® CIT online help.

Far end DS1 path parameters

Alcatel-Lucent 1665 DMX 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 or TMUX 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).

Coding violations Far End (CV-PFE)

The CV-PFE parameter increments based on the PRM G bits defined in the following table.

Table 5-10: CV-PFE parameter increments

PRM Bit = 1	CV Count Accumulated
G1	1
G2	5
G3	10
G4	100
G5	319
G6	333

Errored seconds Far End (ES-PFE)

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.

Severely errored seconds Far End (SES-PFE)

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.

Unavailable seconds Far End (UAS-PFE)

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.

Severely errored frame seconds (SEFS-PFE)

The SEFS-PFE parameter is a count of 1 second PRM intervals that SE bit is equal to 1.

Far end DS1 path PM report

Use the Performance → Reports → DS1 path command to obtain the DS1 Path PM Report. Far end DS1 path PM is reported with an AID of the DS1 or TMUX interface and a modifier of T1. For more information about the DS1 path parameters and the Performance → Reports → DS1 path command, see the WaveStar^® CIT online help.