The service configuration test consists of sequentially testing each service. It validates that the service is properly provisioned and that all specific KPIs or SLA parameters are met.
Service Performance Test
Once the configuration of each individual service is validated, the service performance test simultaneously validates the quality of all the services over time.
In addition, EXFO’s EtherSAM approach proves even more powerful as it executes the complete ITU-T Y.1564 test bidirectionally. Key SLA parameters are measured independently in each test direction, thus providing 100% first-time-right service activation—the highest level of confidence in service testing.
Dual Test Set
Whether the customer is using RFC 2544 or Y.1564 (EtherSAM) for service activation, both tests can be executed in Dual Test Set mode. In this case, two 40G/100G test sets, one designated as local and the other as remote, are used to communicate and independently run tests per direction. The dual-test-set approach is a more accurate test scenario. In this case, two units perform an asymmetrical SLA measurement, providing test results per direction. This scenario’s main strength is that it quickly pinpoints which direction has not been configured properly or is at fault, while providing performance metrics for each direction.
Results from both directions are sent and displayed on the local unit to ensure that the entire test routine can be completed by a single person in control of a single unit, thus resulting in shorter test time and reduced manpower. This flexibility also guarantees that different units can be set as a remote unit. The most interesting scenario is a centralized unit that is always configured as a remote unit with fixed addresses. The carrier can simply dispatch a single test person to a test site, following which the tester can quickly discover and execute service turn-up and burn-in quickly and efficiently without requiring an extra worker in the central office.
The dual test-set approach also provides the capability to segment the network and quickly pinpoint in which direction issues occur. This is especially important in cases where the bandwidth differs between the upstream and downstream directions. In such instances, using a loopback tool will always yield the same results, because the measurement will be affected by the lowest throughput, and the test results will not reflect that one direction has higher performance than the other. The same scenario will occur if a network misconfiguration is present in only one direction of the service. Depending on the error, the problem will not be identified with round-trip measurements. This often results in customer complaints and additional truck rolls. With the dual test-set approach, both directions are independently analyzed at the same time, and pass/fail results are provided per direction, yielding the highest level of confidence in service testing.
Ethernet Traffic Generation and Monitoring
Data services carried over 100G/40G networks are making a significant shift toward supporting a variety of applications. Multiservice offerings such as triple-play services have fuelled the need for QoS testing to ensure the condition and reliability of each service, as well as qualify SLA parameters. The IQS-88100NGE and IQS-88100G Power Blazer, with their supported traffic generation and monitoring application, allow service providers to simultaneously simulate and qualify different applications. Up to 16 streams can be configured with different Ethernet and IP QoS parameters, such as VLAN ID (802.1Q), VLAN priority (802.1p), VLAN stacking (802.1ad Q-in-Q), ToS and DSCP. Traffic simulation also includes traffic shaping with burst and ramp capabilities. The IQS-88100NGE and IQS-88100G also offer the flexibility to define one configuration profile and apply it to as many streams as required. From there, it is just a matter of tweaking them to each stream. The IQS-88100NGE and IQS-88100G also simultaneously measure throughput, latency, packet jitter (RFC 3393), frame loss and out-of-sequence errors in all streams, yielding fast and in-depth qualification of all SLA criteria. Results are displayed in tabular format and on analog visual gauges to ensure that test outcomes are quickly and easily interpreted.
Ethernet Service OAM
Metro Ethernet networks with carrier-class Ethernet services demand performance measurements for proper system maintenance. Ethernet service operations, administration and management (OAM) covers the end-to-end measurements and standards needed for systems maintenance. OAM utilizes a variety of protocols for installing, monitoring and troubleshooting networks, including network discovery, link monitoring, remote fault detection, and remote loopback. This in turn simplifies Ethernet service deployments as Ethernet moves to mass deployment. Ethernet service OAM is also a mechanism for monitoring and validating SLAs that eliminates finger-pointing between carriers. Most service providers are focusing today on implementing connectivity fault management and performance monitoring OAM protocols, including Y.1731, 802.1ag and MEF OAMs on metro Ethernet circuits.
Simplified Error Injection
The IQS-88100NGE and IQS-88100G Power Blazer modules enable error and alarm injection with a single click from any screen, allowing you to ensure circuit continuity prior to starting a test. This capability applies to single optical channels when addressing testing interfaces from 10M to 100G on the IQS-88100NGE and 40G/100G on the IQS-88100G, and extends to four or ten optical channels for 40G and 100G when using parallel CFPs. Furthermore, this functionality can be preprogrammed for any type of error, not just bit errors. In addition, alarm injection can be selected per lane, and not necessarily on all lanes simultaneously.
Complete Overhead Manipulation and Monitoring
EXFO’s IQS-88100NGE and IQS-88100G modules allow for complete OTN and SONET/SDH overhead manipulation and monitoring for advanced testing and troubleshooting. Furthermore and consistent with this module’s simplified testing approach, the overhead manipulation and monitoring capability is categorized under “Functions” in the GUI, and apart from the default setup and results pages. The Functions category offers various 40G/100G testing capabilities required by tier-2 engineers for advanced field troubleshooting, eliminating the need for a second test instrument for those rare situations.
Today, carriers have an opportunity to turn optical networks into a competitive advantage by guaranteeing low-latency traffic transmission for delay-sensitive applications including video, cloud computing and financial trading applications. With this in mind, the IQS-88100NGE and IQS-88100G Power Blazer modules enable OTN, SONET/SDH and Ethernet delay measurements across all supported testing interfaces, enabling carriers to solidify their competitive advantage when building low-latency optical transport networks, and guarantee the speed of service to their end customers.
This functionality measures the time required for a bit to travel from the transmitter of the IQS-88100NGE or the IQS-88100G and back to the receiver after crossing a far-end loopback, thereby providing complete delay results including delay measurement and min./max./average delay statistics.
Rapid Diagnostic Test Tools
Per-Wavelength Laser Control and Power Measurements
Verifying the power level may seem obvious, but it is a vital step often omitted due to lack of convenience or test equipment. The built-in power measurement capability of the IQS-88100NGE and IQS-88100G enables you to accurately test per-channel ingress and egress levels without risking damage to expensive 40G/100G circuit packs caused by high power, or signal degradation resulting from low power on any of the transmitted optical channels.
Per-Lane Frequency and Offset Measurements
Along with optical power measurements, frequency accuracy verification is a good sanity check to determine network health prior to BER testing during 40G/100G network commissioning. The IQS-88100NGE and IQS-88100G Power Blazer modules offer per-lane frequency and frequency offset testing capabilities to verify that the NE’s clock recovery circuitry is operating accurately.
IP Connectivity Tools
As part of the IP connectivity tools, the ping tool is used to verify that the user can reach a specific address within or outside of a subnetwork. The traceroute tool is a modified version of the ping tool and is used to determine the route or the number of hops that are required to reach a destination host. These basic tools, which are supported on the IQS-88100NGE and IQS-88100G Power Blazer modules, are essential when testing through 40G/100G routed networks. The results of these tests can pinpoint critical configuration issues within the network.
Advanced Troubleshooting Tools
The capturing power of EXFO’s IQS-88100NGE and IQS-88100G extends far beyond basic capabilities. The module adds extra features and functionalities to boost test cycle efficiency and provide more value. Its packet capture tool offers comprehensive filtering, triggering and truncation methods to target specific traffic and quickly pinpoint issues in the lab and in the field.
Advanced Traffic Filtering
In some cases, troubleshooting only concerns a particular traffic flow. The advanced traffic-filtering capability of the IQS-88100NGE and IQS-88100G allows you to restrict traffic by using up to four trigger fields and operands (and, or, not). A complete set of triggers is available, such as MAC, IP and TCP/UDP fields, as well as VLAN, MPLS fields.
CFP Health Check
The IQS-88100NGE and IQS-88100G also offer 40G/100G CFP health check testing capabilities. Unlike the single wavelength transceiver used in legacy 2.5G and 10G networks, each CFP parallel optical channel must be monitored for transmitted and received power levels to avoid damaging expensive 100G circuits and equipment. Moreover, each parallel lane must be monitored for frequency and frequency offset to ensure proper clock and timing recovery.
The CFP information page now provides detailed information on the module, no longer requiring the removal of the CFP in order to read the CFP module details. Complete management data input/output (MDIO) read/write access has also been given, allowing advanced network engineers to verify the management interface in the CFP through a registered access, as per the CFP Multi-Source Agreement (MSA). For example, access to the MDIO allows the user to read the CFP operational temperature when needed for troubleshooting purposes.
The IQS-88100NGE and IQS-88100G also include a 100G automated stress-test application that covers transmission tolerance tests like static skew measurement, crosstalk, electrical amplitude and pattern dependency. Essentially, all manual interventions have been removed, thus simplifying the CFP qualification process. In short, this tool will allow carriers to ensure the optimal performance of 100G networks during evaluation and deployments.
CFP2 – The Second-Generation High-Speed Transceivers
In today's competitive market, service providers strive to meet their bandwidth requirements by upgrading their networks to higher speeds. Taking this into consideration, network element manufacturers (NEMs) have shifted their 100G development to leverage the second-generation high-speed transceivers known as CFP2s. These new CFP2 transceivers have the significant advantages of being 50% smaller in form factor and saving more than 50% on power consumption when compared to first-generation transceivers (CFPs). They also enable higher port density on high-speed transmission, switching and routing systems required for 100G mass deployments.
EXFO's IQS-88100NGE/88100G Power Blazer modules offer 100G testing capabilities for CFP2 transceivers thanks to the new FTB-85970 CFP-to-CFP2 adapter, which requires no additional high-speed modules. This CFP-to-CFP2 adapter provides the flexibility needed to support the industry's different implementations of 100G transceivers, including the 4 X 25G and 10 x 10G. Customers can therefore have full access to 100G testing capabilities on their lab unit using both CFP and CFP2 transceivers at a fraction of the cost of upgrading their full fleet of test units to dedicated CFP2-based modules. This unique offering on the market ensures a maximum ROI and eliminates the need for multiple test modules.