LightSpeed1000™ - BERT
(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. For details, click the links below:
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.
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.
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.
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.
Screen Shot of PoS IP Layer Parameters
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.
Screen Shot of ATM 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
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).
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.
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.
Screen Shot of ATM 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.
Screen Shot of ATM BERT Statistics
Screen Shot of PoS BERT Statistics
Buyer's Guide
| Item No. |
Item Description |
| LTS200 |
OC-3 / STM-1 ATM Monitor, BERT, Tx/Rx Test, RAW |
| LTS300 |
OC-12 / STM-4 ATM Monitor, BERT, Tx/Rx Test, RAW |
| LTS201 |
OC-3 / STM-1 PoS Monitor, BERT, Tx/Rx Test, RAW |
| LTS301 |
OC-12 / STM-4 PoS Monitor, BERT, Tx/Rx Test, RAW |
| |
Hardware Platform |
| LTS100 |
Dual OC-3 / STM-1 OC-12 / STM-4 PCI Express
Card |
| LTS105 |
Portable Dual OC-3 / STM-1 OC-12 / STM-4 |
| |
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 |
| |
DDR2 Memory Options - 512 MB, 1 GB, 2 GB |
| |
SFP Options - |
| |
Fiber cables |
| |
Fiber connector |
| |
OC-3 / STM-1 OC-12 / STM-4 Monitor Parts |
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