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Monitor T1/E1 Line

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Monitor T1/E1 Line Status application is included with T1 E1 Basic Software

Overview

T1 E1 Analyser provides several ways to monitor  line conditions on multiple T1/E1 lines simultaneously.

A simple GUI application is used to monitor not just different types of alarms and errors, but also frequency, the power level and clock/frame/bit slips.  The different types of alarms and errors monitored include - line sync loss, BPV, carrier loss, frame error, blue alarm, yellow alarm, and alarm indication signal (AIS), in case of T1 and line sync loss, HDB3 violation, carrier loss, frame error, remote, distant MF, and alarm indication signal (AIS) in case of E1.

Clock Slips are measured as a count of the difference between a reference T1 E1 clock and another T1 E1 signal being measured. A Clock Slip is a one-second-interval measurement (accuracy of the timing slips is +/- 1 count) that arise because of phases differences or frequency differences of the incoming signal vs. the outgoing signal timing (the reference).

Enough clock slips (usually counts reaching 192 or 193) create a frame slip, and eventually, lost or repeated data. GL’s T1 E1 Analyzer can measure clock slips between two T1 E1 timing signals.

GL also provides Physical Layer Analysis - a non-intrusive analysis application (requires additional license XX100) that acts like a probe to continuously monitor various alarms and error counters, and log this information to a central database over TCP/IP. The analyzer helps to track the time at which alarms (Sync Loss, Carrier Loss, Remote, Distance MF, AIS) occurred periodically and send these information to the central database over TCP/IP.

In conjunction with GL’s NetsurveyorWeb™, these non-intrusive "probes" for TDM networks deployed at strategic locations in a network, provide an instant overall graphical view of the health of the TDM network with drill down to individual lines. It provides a secure access through web, remote monitoring and diagnostics to troubleshoot any T1 E1 line.

T1/E1 Alarms Monitoring

Distant Multiframe (MF) - (E1 Only):
This indication will flash when a distant multiframe alarm is detected. A distant multiframe alarm is defined as the reception of three consecutive 1s at bit position of timeslot 16 in frame 0. This indication is only valid when in CAS mode.

Unframed All Ones - (E1 Only):
This will flash whenever an all ones condition is detected in the received bit stream. An all ones condition is defined as less than 3 zero bits received between the last align and non-align frames.

CAS Multiframe Error - (E1 Only):
This will flash whenever multiframe errors are detected that cause a resync of the frame and multiframe alignment to occur.

Remote Alarm Detected - (E1 Only):
This will flash when a remote alarm is detected. A remote alarm is defined as the reception of three consecutive 3 consecutive bits equal to 1 of timeslot 0 of non-align frames.

HDB3 Violations (E1 Only):
 High Density Bipolar 3(HDB3) is a ternary transmission code in which the number of consecutive zeros which may occur is restricted to three, to ensure adequate clock recovery at the receiver. In any sequence of four consecutive binary zeros, the last zero is substituted by a mark of same polarity of the previous mark, thus breaking the Alternate Mark inversion (AMI) code. This mark termed a violation

Bipolar Violation (T1 Only):
Bipolar violations are recorded within the frame chip in an 8 bit Counter. This light will flash to RED whenever new bipolar violations are detected.

Blue Alarm (T1 Only):
This will flash when a blue alarm is detected. A blue alarm is defined as the reception of unframed all ones condition. The algorithm used is to simultaneously check for an out-of-frame (OOF) condition, and check for 14 or less zeros out of 13,895 bits. All bits, including framing bits, are tested. The alarm is cleared if OOF condition clears, or if 15 or more zeros are counted within 13,895 bits.

Yellow Alarm- (T1 Only):
This will flash when a yellow alarm is detected. The format of the alarm detected is determined by the framing format and the settings in the Config Menu. When the format for the yellow alarm is specified as bit 2 suppressed in 193S or 193E mode, a yellow alarm is defined as a "0" in bit (2nd MSB) of every DS0 timeslot for 256 or more consecutive timeslots. The alarm clears when a "1" is detected in the bit 2 position of any timeslot. If the yellow alarm is specified as FDL yellow alarm in 193E mode, then a yellow alarm is declared after 16 repetitions of "00FF" on the FDL. The alarm clears with the detection of any bit, which violates the sequence. If the yellow alarm is specified as the S-bit yellow alarm in 193S mode, then a yellow alarm is declared whenever a "1" is detected in the F-bit of frame 12. The alarm is cleared when a zero is detected in the F-bit of frame 12.

Line Sync Loss:
This will flash when a receiver resync is in progress. If the receiver is set to auto resync in the Configuration Menu the receiver will begin resync when an OOF (Out Of Frame) event or Loss of Carrier is detected.

Carrier Loss:
Carrier loss alarm is declared when 128 ± 1 consecutive zero's are detected. Carrier loss clears when a "1" is received.

Frame Error:
This will flash whenever a framing bit is in error. For T1 systems, in 193S mode, the Ft bits are monitored (odd F-bits). In 193E mode, FPS bits are monitored (F-bits of frames 4, 8, 12, 16, 20 and 24). For E1 systems, framing bit errors are detected in timeslot 0.

Alarm Indication Signal (AIS):
The receiver detects an AIS pattern when it receives less than three zeroes in any string of 2048 bits. The AIS condition is cleared when three or more zeros are detected in 2048 bits.

Features

Active:
Whenever any alarms are active, the Active indicator glows in RED informing about the alarms status.

Not Active:
The alarms are said to be not active if none of the alarms are detected on E1/T1 link. This will be show with a Green LED for the corresponding alarms.

History:
When any of the alarm is detected and then switches to not active state, the alarm is considered as History and will be shown with Yellow LED.

Error Counters, Frequency, Power Level

Frequency:
This shows the T1/E1 line frequency in Hertz (Hz)

Level:
This shows the T1/E1 line power in dBm

Error Counters:

BPV : This provides a counter for the BPV alarms. Uses an eight bit counter
OOF : This provides a counter for the Out of Frame alarms. Uses an eight bit counter
Frame : This provides a counter for the frame errors. Uses an eight bit counter
CRC : This provides a counter for the CRC errors. Uses an eight bit counter

Transmit Under Run : 
Tx Underrun is indicative of multiframe(s) transfer problem from PC to the T1/E1 Analyzer. Whenever this error happens, T1/E1 Analyzer starves data for transmission and so previous multiframe(s) will be sent on T1/E1.

Receive Over Run : 
Rx Overrun is indicative of multiframe(s) transfer problem from T1/E1 Analyzer to the PC. Whenever this error happens, PC/Application will lose multiframe(s) from the T1/E1 Analyzer.

Bit/Frame Clock Slips Functionality

The T1 E1 hardware can measure timing differences between

  • Internal Timing Source vs. Recovered Timing on Port 1, or Port 2
  • External Timing Source vs. Recovered Timing on Port 1, or Port 2
  • Recovered Timing on Port 1 vs. Recovered Timing on Port 2
   

Internal Clock Slip Reference

This Clock Slip measurement compares the incoming receive clock from the port against the internal clock provided by the unit. The software compares the internal counter to the recovered clock counter by storing these counts.


Crossport Clock Slip Reference

Crossport Clock Slip Reference

This Clock Slip measurement compares the incoming receive clock from port #1 against the incoming receive clock from port #2 using the Recovered clock on port #1 and Recovered clock on port #2.

External Clock Slip Reference 

This Clock Slip measurement compares the incoming receive clock using the Recovered clock of port 1 or 2 against the external clock provided on the external clock input. In this case the external clock must be either a T1 or E1 signal.
 

Physical Layer Analysis


Physical Layer Analysis is used to monitor T1E1 line alarms. The analyzer helps to track the time at which alarms (Sync Loss, Carrier Loss, Remote, Distance MF, AIS) occurred periodically and send these information to the central database over TCP/IP.

GL’s NetSurveryorWeb™ accesses fetches the records from the central database and facilitates the user to monitor physical layer status of T1/E1 line via simple web based clients. For more details, refer to Network Line Monitor and Test

Supported Alarms

Line Sync Loss: This alarm indication will flash when a receiver resync is in progress. If the receiver is set to auto resync in the Configuration Menu, the receiver will begin resync when an OOF (Out Of Frame) event or Loss of Carrier is detected.

Carrier Loss: Carrier loss alarm is declared when 128 ± 1 consecutive zero's are detected. Carrier loss clears when a ‘1’ is received.

Remote Alarm Detected (E1 Only): This alarm indication will flash when a remote alarm is detected. A remote alarm is defined as the reception of three consecutive bits equal to ‘1’ of timeslot 0 of non-align frames.

Distant Multiframe (MF) (E1 Only): This alarm indication will flash when a distant multiframe alarm is detected. A distant multiframe alarm is defined as the reception of three consecutive 1s at bit position of timeslot 16 in frame 0. This indication is only valid when in CAS mode.

Alarm Indication Signal (AIS): The receiver detects an AIS pattern when it receives less than three zeroes in any string of 2048 bits.  The AIS condition is cleared when three or more zeros are detected in 2048 bits.


Detail View of Alarms

The summary view displays which alarm has occurred along with the particular timestamp and error counts. It also indicates the Frequency and Level for the counters.

Error Counters

Frequency: This shows the T1/E1 line frequency in Hertz (Hz)
Level: This shows the T1/E1 line power in dBm


Detail View of Counters

Buyer's Guide

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Item Description

XX100

Physical Layer Analysis

 

Related Software

XX629

ISDN Emulator (T1 or E1) w/ command line interface

XX648

MAPS™ ISDN Emulator

PKV105

SIGTRAN Analysis

XX090

HDLC Capture and Playback Software (T1 or E1)

XX105

ISDN Emulator (T1 or E1)

XX120

SS7 Analyzer Software (T1 or E1)

XX130

Real-Time Frame Relay Protocol Analyzer (T1 or E1)

XX150

GSM Analysis Software (T1 or E1)

XX153

TRAU Analysis Software (T1 or E1)

  Related Hardware

PTE001

tProbe™ Dual T1 E1 Laptop Analyzer with Basic Analyzer Software

HDT001/HDE001

Legacy HD T1 or E1 (PCI) Cards with Basic Analyzer Software

HTE001

Universal T1/E1 Card with Basic Analyzer Software

UTE001

Portable USB based Dual T1 or E1 Laptop Analyzer with Basic Analyzer Software

 

Related Hardware

XTE001
XUT001 XUE001

Dual T1 E1 Express (PCIe) Boards (requires additional licenses)
Dual T1 E1 Express Card Basic T1 Software (includes xx600, xx605)
Dual T1 E1 Express Card Basic E1 Software (includes xx600, xx605)

FTE001
ETE001
ETA001
EEA001

QuadXpress T1E1 Main Board (Quad Port– requires additional licenses)
OctalXpress T1E1 Main Board plus Daughter Board (Octal Port– requires additional licenses)
Basic Software for T1 (includes xx600, xx605) (zero dollar, but required with appropriate licenses) 
Basic Software for E1 (includes xx600, xx605) (zero dollar, but required with appropriate licenses)

UTE001
UTA001
UEA001
SA000c

Dual Laptop T1/E1 Hardware USB Base Unit 
Basic Laptop T1 Software (includes xx600, xx605)
Basic Laptop E1 Software (includes xx600, xx605)
High Stability Internal Clock Option

HTE001
HUT001
HUE001
SA000a

HD Universal Dual T1/E1 Card
HD Universal Card Basic T1 Software (includes xx600, xx605)
HD Universal Card Basic E1 Software (includes xx600, xx605)
High Stability Internal Clock Option

PTE001
PTA001
PEA001
SA000c
PTE015
PTE025

tProbe™ T1 E1 Base Unit 
tProbe™ Basic T1 Software (includes xx600, xx605)
tProbe™ Basic E1 Software (includes xx600, xx605)
High Stability Internal Clock Option 
w/ 2Wire FXO and FXS Optional Board
w/ Data Communications Optional Board for RS-232, RS-449, RS-422, RS-423, EIA-530, 
V.35 Interfaces

 

Network Monitoring Software Options

PKV170

Network Surveillance Base Software (Perpetual License, Unlimited Users/Nodes) 
– Includes Standard Server-Grade Computing Platform

PKV171

NetSurveyor Agent Toolkit

 
 
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