GL Announces
Enhanced PC based Ethernet/IP Test Tool
Welcome to another January 2015 issue of GL Communications' newsletter providing
information and insight into our enhanced PC Based Ethernet Tester referred to as
PacketCheck™ .
Overview
GL's PacketCheck™ is enhanced with stacked VLAN, MPLS and also with a capability to provide
XML reports. It's a complete PC based Ethernet / IP test tool with BERT, Throughput, Delay, and
Impairment testing functions. PacketCheck™ is very easy to use as a general-purpose network
performance analysis tool for 10Mbps, 100Mbps and 1Gbps LANs and WANs. Throughput up to
800 Mbps can be easily tested.
The PacketCheck™ truly takes confusion out of Ethernet testing at all protocol layers - from raw
Ethernet frames to IP, UDP, VLAN, and MPLS packets. It makes use of PC's network interface
card (NIC) to transmit and receive Ethernet or IP packets over the network.
The application can generate multi-stream Ethernet, IP, or UDP traffic with on-demand
bandwidth (up to 800 Mbps). PacketCheck™ also measures end-to-end performance such as Bit
Error Rate, Total Packets, Packet Loss, Out of Sequence Packets, and Error Packets. Additional
features include transmission of pre-recorded file traffic, Bursty and Fixed IFG (Inter Frame Gap)
traffic generation modes, delay measurements including One Way Delay - [within the same PC]
and Round Trip Delay, impairment generation, and BER testing capability with provision to
generate PRBS patterns or user-defined test patterns.
PacketCheck™ supports features like transmission of pre-recorded file traffic, which can
duplicate packet traffic as it occurred at a particular Ethernet interface. It also includes a
Command Line Interface (CLI) to support all the GUI functionalities of PacketCheck™ through
simple commands, allowing easy scripting and automation of testing. Also included is a
powerful Report Generation feature to view report in XML and PDF formats.
PacketCheck™ can operate on any of the layers - Layer 1 (Physical), Layer 2 (Data Link), Stacked
VLAN (Q-in-Q), Layer 2.5 (Stacked MPLS), Layer 3 (Network), and Layer 4 (Transport - IP/UDP) of
the OSI reference model.
Important Enhancements Introduced:
One Way Delay - [within the same PC]
One-Way Delay - [within the same PC] is defined as the time a packet takes to travel from
source to destination. PacketCheck™ determines One-way Delay - [within the same PC]
measurements between two NIC cards on a single PC with 2 instances of PacketCheck™
running, one on each NIC card in microsecond accuracy.
Stacked VLAN
VLAN allows different hosts to be a part of the same virtual LAN irrespective of their physical
location. A group of hosts connected to the same switch can be partitioned into several VLANs,
or a group of hosts connected to different switches can be combined into a single VLAN. VLAN
technology is used in Carrier Ethernet networks, where a common transport network carries
traffic of different customer VLANs by utilizing the concept of stacked VLANs. PacketCheck™
supports customizable VLAN stacks up to 3 levels with user configurable VLAN Type, ID, and
Priority.
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VLAN ID: a 12-bit field specifying the VLAN to which the frame belongs
VLAN Priority: a 3-bit field indicating the frame priority level from 0 (lowest) to 7
(highest), which is used to prioritize different classes of traffic (voice, video, data, etc)

VLAN Type Field: a 16-bit field indicating a newly inserted VLAN header's EtherType.
The usual and widely recognized value for this is 0x8100. User can select from 5
different values - 0x8100, 0x88A8, 0x9100, 0x9200, 0x9300.
Stacked MPLS
PacketCheck™ supports stacked MPLS layers up to 3 levels customizable with headers like
Label, CoS, TTL.
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A 20-bit LABEL value
A 3-bit Traffic Class field for priority (CoS bits, also known as the EXP or experimental
bits)
A 1-bit bottom of stack flag. If this is set, it signifies that the current label is the last in
the stack.
An 8-bit TTL (time to live) field
Bit Error Rate Testing (BERT)
True Bit Error Rate Testing (BERT) on layer 1, layer 2, layer 2.5, layer 3, and layer 4 with various
measurements - Bit Error Rate, Sync Loss Count, Bit Error Count, and more have been
introduced. PacketCheck™ calculates Bit Error Rate for the PRBS pattern being received.
ARP Packets
Capability to generate/respond to ARP requests making it easy to work with Routers. ARP
packets are sent to determine the MAC address of the destination.
Common Statistics
The application now supports Common Statistics and these are stream independent at the NIC
card level. These statistics are gathered before stream level statistics processing and these
statistics helps user to check if the NIC card is receiving any traffic, and if receiving, if it is nontest traffic i.e. traffic not belonging to any of the configured streams.
Report Generation
Report generation feature now supports both XML and PDF formats. Reports include
information such as the Statistics, Configuration Information, NIC card details, Stream Statistics,
Common Statistics, VLAN, MPLS, etc with customizable headers and footers. Users can include
their comments and logo in the report.
Users can also generate a periodic report for the selected stream while the test is running (in
XML format). Users can specify the periodicity of the report per stream.
Stream Specific and Common Statistics
This feature provide per stream measurement of throughput, round trip delay (RTD), one way
delay (OWD)- [within the same PC], total packets, packet loss, out of sequence frames, error
frames, correct pattern frames, pattern sync status, bit error rate, sync loss count, error count
etc.
Common statistics allow monitoring receiving traffic on the NIC by aggregating the
measurements on all streams on the NIC. This is mainly helps user to know if any extra traffic is
being received on the NIC.
Other features include:

Bit Error Rate and Performance Statistics
Measures Bit Error Rate at all layers - Layer1/2/3/4. Also, measures packet performance
statistics like Throughput, Packet Loss, Out of order frames, One Way Delay - [within the
same PC] and Round Trip Delay.

HDL File Playback
PacketCheck™ can transmit HDL file traffic. An HDL file is GL's Ethernet traffic capture
format.

Traffic Generation Modes
In the Inter Frame Gap (IFG) mode, the emphasis is on maintaining the IFG between
successive packet transmissions. User can configure the IFG value. In the bust mode
where traffic generated was bursty and the emphasis was on maintenance of the
configured bandwidth.

Impairments Generation
Provide the capability to generate various run-time impairments like Insert/Delete Bytes
and Byte Level Impairments (AND, OR, XOR).

PacketCheck™ Command Line Interface
All the functionalities of PacketCheck™ can be accessed via commands exclusive of the
GUI.

Multistream Traffic generation with independent configuration parameters and
measurements for each stream
For the comprehensive information on the application, you can refer to PacketCheck™ Software
web page.
Please review the above and give us a call if you are interested in the above product/software
or for any other applications listed in our website. We would be happy to discuss your testing
needs and we look forward to hearing from you.
Warm Regards,
Shelley Sharma
Phone: 301-670-4784 x114
Email: gl-info@gl.com