SONET & SDH optical testing

OC-3/STM-1 and OC-12/STM-4 Analysis and Emulation

BERT - LightSpeed1000™ (Legacy)

(OC-3 / STM-1 and OC-12 / STM-4)

Overview

LightSpeed1000™ supports Bit Error Rate Testing over ATM and PoS OC-3 / STM-1 and OC-12 / STM-4 interfaces.

  • ATM BERT
  • PoS BERT
LightSpeed1000™ - BERT

ATM BERT

ATM Bit Error Rate Test (BERT) application permits BER testing over ATM layer, The application allows to configure ATM headers for UNI & NNI interfaces, to generate/detect Pseudo Random Bit Sequence (PRBS) patterns, and user-defined bit patterns. In addition, the application includes single bit error insertion, auto error insert rate from 10-1 to 10-9, invert and non-invert selections.

A variety of standard data patterns are available for test purposes.

Main Features

  • User-defined header configuration supported.
  • User-defined traffic rate to the accuracy of 0.001% of total bandwidth
  • Payload configuration to different PRBS patterns or user defined pattern. User defined pattern length can be 2 to 32 bits in length.
  • User definable pre-sync achieve window, sync loss bits window, and sync loss declare window
  • Supports sequence number insertion, inverting payload data, single bit error insertion, and error rate insertion
  • Provides detail statistics such as Rx/Tx cell count, idle cell count, bit error count, HEC error count
  • Provides throughput details, error and alarm LEDs for easy analysis
ATM BERT Main Window

Screen Shot of ATM BERT Main Window

PoS BERT

PoS BERT Bit Error Rate Test (BERT) run over IP over PPP payload area. The application allows to configure layer 3 IP parameters such as IPv4 headers, generates/detects Pseudo Random Bit Sequence (PRBS) patterns, and user-defined bit patterns. In addition the application includes single bit error insertion, error insert rate from 10-1 to 10-9, invert and non-invert selections and sequence number options.

Main Features

  • User-defined header configuration also supported.
  • User-defined traffic rate to the accuracy of 0.001% of total bandwidth.
  • Payload configuration to different PRBS patterns or user defined pattern. User defined pattern length can be 2 to 32 bits in length.
  • User-definable pre-sync achieve window, sync loss bits window, and sync loss declare window.
  • Supports sequence number insertion, invert payload data, single bit error insertion, and error rate insertion.
  • Provides detail statistics, such as Rx/Tx packet count, bit error count, IP and UDP checksum error count.
  • Provides throughput details, error and alarm LEDs for easy analysis.
PoS BERT Main Window

Screen Shot of PoS BERT Main Window

Layer configuration

ATM Layer (in ATM BERT only)

ATM layer provides configuration of ATM header fields such as GFC (Generic Flow Control), VPI (Virtual Path Identifier), VCI (Virtual Channel Identifier), PT (Payload Type) , and CLP (Cell Loss Priority). ATM header fields for UNI will have GFC (Generic Flow Control) enabled, while for NNI interface GFC field is disabled.

ATM Header Fields

Screen Shot of ATM Header Fields

Layer 3 - IPv4 Parameters (in PoS BERT only)

PoS BERT support IPv4 standard parameters such as Src / Dest IP Address, Type of Services (ToS)/Differentiated Service, Time To Live (TTL), Protocol, Header Checksum, Auto Checksum and Identification. Source and Destination IP addresses at Rx Config are used to match with the received packet's Source and Destination address. If they do not match, the packet is rejected as Non Test Packet.

PoS IP Layer Parameters

Screen Shot of PoS IP Layer Parameters

IPv4 Header Format

Screen Shot of IPv4 Header Format

Payload

Payload at the Tx configuration allows user to select specific Bit Error Rate test pattern for transmission. LightSpeed1000™ Analyzer support various BERT patterns; 29-1, 211-1, 215-1, 220-1, 223-1, 229-1, 231-1, all ones, all zeros, alternate 1s and 0s, and user-defined pattern.

While at Rx configuration these patterns are used to verify the incoming BERT pattern. Additionally, user definable pre-sync achieve, sync loss bits, and sync loss declare options can also be set. Pattern Sync is achieved only if BERT pattern matches.

ATM BERT Payload

Screen Shot of ATM BERT Payload

PoS BERT Payload

Screen Shot of PoS BERT Payload

Traffic Rate

The Traffic Rate for ATM BERT supports Bandwidth Rate defined in :

  • percent with range starting from 0.01 to 100% of current bandwidth
  • Cell Ratio, where users can set the amount of ATM traffic cells and idle cells
ATM Traffic Rate

Screen Shot of ATM Traffic Rate

In case of PoS BERT, users can specify the Frame Length in bytes, ranging from 29 bytes to 1788 for normal frame sizes and the desired rate either in bandwidth percent of the link speed or in frames/sec (fps).

PoS Traffic Rate

Screen Shot of PoS Traffic Rate

Impairments

ATM & PoS BERT allows users to insert single bit error or error rate from 10-1 to 10-9 into the outgoing (TX) BERT stream.

BERT Impairments

Screen Shot of BERT Impairments

Results

The module displays the real-time BERT results in the Results pane. The Result screen displays both BERT Status and BERT Statistics such as count of No rx data, bits received, bit errors, bit error rate/seconds, sync loss count/seconds, error free seconds, and out-of-sequence bits (only in Pos). BERT Status provides a quick view of the BERT Test status in the form of Alarm LEDs.

ATM BERT Results

Screen Shot of ATM BERT Results

PoS BERT Results

Screen Shot of PoS BERT Results

Statistics

Tx Statistics displays Frame count and Byte count values. This is currently under development.

In ATM analyzer, Rx Statistics displays the count of total cells, idle cells, Bert test cells, filtered out cells, and HEC error frames.

In PoS analyzer, Rx Statistics displays count of Total frames, IPv4/IPv6/UDP frames, IP/TCP/UDP/ICMP/IGRP/Other data frames, IP/UDP checksum error frames, and Non IP/UDP test frames.

ATM BERT Statistics

Screen Shot of ATM BERT Statistics

PoS BERT Statistics

Screen Shot of PoS BERT Statistics

Resources

Item No Item Description
LTS200 OC-3 / STM-1 ATM Monitor, BERT, Tx/Rx Test
LTS300 OC-12 / STM-4 ATM Monitor, BERT, Tx/Rx Test
LTS201 OC-3 / STM-1 PoS Monitor, BERT, Tx/Rx Test
LTS301 OC-12 / STM-4 PoS Monitor, BERT, Tx/Rx Test
  Hardware Platform
LTS100 Lightspeed1000™ - Dual OC-3/12 STM-1/4 PCIe Card

Accessories
PCIe 2x fans (1)
LTS105 Lightspeed1000™ - Portable Dual OC-3/12 STM-1/4 USB Unit

Accessories
USB Cable 2.0 (portable only) (1)
12 V Power Adapter (1)
  Other Related Software
LTS203 OC-3 / STM-1 PoS and RAW Record / Playback
LTS303 OC-12 / STM-4 PoS and RAW Record / Playback
LTS204 OC-3 / STM-1 ATM Protocol Analysis
LTS304 OC-12 / STM-4 ATM Protocol Analysis
LTS205 OC-3 / STM-1 PoS Protocol Analysis
LTS305 OC-12 / STM-4 PoS Protocol Analysis
LTS206 OC-3 / STM-1 UMTS Protocol Analysis
LTS306 OC-12 / STM-4 UMTS Protocol Analysis
  Related Hardware
LTS100 Lightspeed1000™ - Dual OC-3/12 STM-1/4 PCIe Card
LTS105 Lightspeed1000™ - Portable Dual OC-3/12 STM-1/4 USB Unit
LTS404
LTS405		 SFP, Single Mode
SFP, Multimode

SA019a
SA019b
SA019c
SA019d
SA019e
SA019f

1 Gbps / 10 Gbps Fiber Optic Cable, Single-Mode, Duplex LC to Duplex LC
1 Gbps / 10 Gbps Fiber Optic Cable, Single-Mode, Duplex LC to Duplex SC
1 Gbps / 10 Gbps Fiber Optic Cable, Multi-Mode, Duplex LC to Duplex LC
1 Gbps / 10 Gbps Fiber Optic Cable, Multi-Mode, Duplex LC to Duplex SC
40G / 100G  Fiber Optic Cable, Multi-Mode  
40G / 100G  Fiber Optic Cable, Single-Mode