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Handheld network analyzers

Fluke's NetTool wins our World Class Award in a five-product test of these essential tools for your network first-aid kit.

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When your network is sick, you become the network doctor. One tool in your "little black bag" of diagnostic tools should be a handheld network analyzer. These devices can reveal cable faults, detect chattering network adapters, identify switch malfunctions and determine the nature of a router malady. These are the problems that cause most network infrastructure failures. Having the right network testing tools can save hours or even days of network downtime.

Cable testing glossary
How we did it
Comparing the products
Net Results

When trouble strikes, you'll want to be ready to quickly diagnose the problem.

Protocol analyzer software on a notebook computer can be helpful when you're trying to diagnose a network problem, but a protocol analyzer can't tell you whether a cable contains a broken wire, some insulation has chafed from a cable or a sick network adapter is behaving strangely (You can brush up on your cable testing terms and concepts, check out Cable Testing 101.

Handheld network-testing device vendors have included several protocol-analysis functions inside what were formerly just cable-testing tools. The vendors say the tools can quickly spot problems ranging from cable faults to overutilization. To test these claims, we invited vendors to submit handheld devices to our lab for evaluation. We looked for fast, accurate determination of cabling and other network problems; some ability to transfer data into a PC for further analysis and reporting; ease of use; and a reasonable price. We particularly wanted a device to be able to diagnose problems on a live network, not just at cable installation time.

Agilent Technologies submitted FrameScope 350 Network Performance Analyzer kit, which includes FrameScope 350 and DualRemote 350. Psiber Data Systems shipped us its Pinger Network IP Test Tool. Fluke Corp. sent us three tools, NetTool Connectivity Tester, OptiView Network Analyzer and OneTouch Series II Network Assistant. Because Fluke recently acquired another handheld testing-tool vendor, Microtest, we let Fluke submit three products for this review. Ideal Industries declined to send its Lantek 7, saying the device is just for checking new cable installations.

In selecting a winner, we discovered that two of the five products were worthy of a World Class Award. Fluke's NetTool gets the official World Class nod because it accurately pinpointed cabling and network faults with aplomb, and without a fancy color display or extra bells and whistles.

Pricing differences

Fluke's NetTool ($900) offers a basic set of essential features for detecting problems such as cable faults, link configuration errors, odd network adapter behaviors, network health ailments and unresponsive servers. Although the NetTool's user interface and results display are simple and utilitarian, it has almost as many diagnostic features as Agilent's FrameScope 350 ($6,000) and the OneTouch Series II Network Assistant ($4,200) for a fraction of the price. Both the FrameScope 350 (2.6 pounds) and the OneTouch (1.7 pounds) are heavier touch-screen cable fault and network-diagnostic tools, while NetTool is a lightweight five-key LCD-screen unit. The Psiber Pinger ($350) is an 8.7-ounce, easy-to-carry, 19-key device that pings from one to eight IP addresses via Internet Control Messaging Protocol (ICMP) packets.

Fluke's OptiView Network Analyzer ($13,000), the heaviest device at 6.2 pounds, is the ultimate network-diagnostic tool. It's a full-blown touch-screen protocol analyzer outfitted with comprehensive cable-testing capabilities.

Physical features

The simple but utilitarian NetTool has four cursor buttons, a select button and a power button. Getting used to touching the buttons with just the right amount of pressure takes some practice. The screen is a simple eight-line monochrome LCD with rudimentary but easily recognizable icons for network devices and basic operations such as navigating the different screens. The user interface is practical, straightforward and surprisingly intuitive. The initial screen offers two choices: autotest and device configuration. Selecting autotest when the unit is attached to a cable with a wiremap plug at the other end invokes the NetTool's cable-testing functions. Choosing autotest when the unit is attached to a hub or switch displays network health, link configuration and other network-diagnostic test results. If you connect a network device to one of NetTool's two RJ-45 ports and connect the other RJ-45 port to that device's network cable, autotest collects and shows identifying information and traffic statistics for the network device.

The OneTouch sports a monochrome touch screen. Fluke doesn't supply a stylus with the OneTouch, but we didn't need one. Fingertips worked just as well on the well-spaced icons that Fluke designed. The display updates continuously, and touching a screen navigation icon, device icon, IP address or other on-screen element lets you quickly drill down to see more detail or to perform a specific operation.

The FrameScope has a beautiful, color LCD touch screen that is a dream to operate with or without the supplied stylus. The DualRemote 350 is a slave unit that needs no user interaction, but it has 16 LEDs that display cable-testing results such as attenuation errors, split pairs, NEXT errors, return loss errors and ELFEXT errors. The FrameScope's screens are not quite as intuitive as those of the OneTouch, but only a few moments are needed to get used to them each time the machine is powered on and to go searching for trouble on the network. Unfortunately, FrameScope doesn't use its list of discovered nodes to establish a default collection of network devices to test. You must manually add devices to a particular autotest suite.

Imagine a color notebook computer running Windows. Now take away the keyboard and give the computer a touch-screen display with a well-designed, easy-to-navigate icon-based user interface. Install protocol-analysis software on the computer and a network interface that can run cable fault diagnostics and measurements. Voila! You've created an OptiView Network Analyzer. OptiView's user interface will be instantly second nature to anyone familiar with Windows who can use a stylus to select on-screen icons, buttons and data elements. OptiView's user interface has an on-screen virtual keyboard, but you can optionally connect a standard PC keyboard to an OptiView.

The Pinger has 19 keys that resemble a telephone keypad with extra functions. Just like telephone keypad keys, twelve of the keys are for data entry of names and IP addresses. Four are cursor keys, and the remaining three are function keys for selecting on-screen menu items such as exit, save and setup. The four-line monochrome LCD screen is a bit wider than a typical cell phone's screen. Navigating the Pinger's few screens is a breeze.

All the units come with batteries and AC adapters, and, to conserve battery power, they all go to sleep or shut down after about 5 minutes of inattention.

Comparing the handheld network analyzers
 PRODUCT   Fluke NetTool
PRICE $900
CABLE TESTS Determines cable length.
Detects opens (broken wires), short circuits and split pairs.
Displays whether Ethernet wall outlet is live and what’s at the other end of the connection.
Determines line speed, full/half duplex, polarity and segment ID.
NETWORK TESTS Discovers and identifies IP servers by looking for DHCP, DNS, SMTP, POP, IMAP, HTTP and WINS protocol traffic.
Uses NetWare Core Protocol over IPX to find NetWare servers.
Uses Server Message Block protocol over NetBEUI or TCP/IP to find Windows primary domain controllers, back-up domain controllers and master browsers.
Locates routers based on IGRP, EIGRP, OSPF, IRDP and RIP protocol traffic.
Can also find IP-, IPX- and DLC-based network printers.
Autotest features can display detected problems (including line speed mismatches, wiring errors and half/duplex errors), recognized protocols (alerts you when NetTool encounters specified protocols), identified key devices (including counts of DNS/ DHCP servers, NetWare servers, Web servers, NetBEUI/NetBIOS servers, e-mail servers and printer servers) and general network health (identifying short frames, excessive network utilization, NetWare frame type mismatches and TCP/IP addressing errors such as duplicates, incorrect subnet masks and wrong gateway/router addresses).
BATTERY TYPE & LIFE 4 double-A alkaline batteries; about 8 hours of continuous use.
 PRODUCT   Fluke OptiView
PRICE $13,000
CABLE TESTS Measures cable length.
Displays wiremap information, wire pairings, impedance, short circuits, opens and split pairs.
Ethernet Pro Gigabit model tests 10/100M bit/sec and Gigabit Ethernet networks.
NETWORK TESTS Shows multiple port statistics on a single screen.
Graphically reveals network utilization detail at various levels, such as local/remote and the entire network.
Identifies top talkers, top multicasters and top broadcasters.
Device discovery feature finds and displays hosts, switches, routers, SNMP hubs, SNMP agents, network printers and network stations.
Network discovery identifies and categorizes IP subnets, NetBEUI/NetBIOS domains and IPX (NetWare) segments.
Protocol statistics display all protocols on network, including routing protocols.
Problem discovery categorizes events as errors, warnings or informational entries; pinpoints devices experiencing problems.
Generate traffic and uses RMON2 to gather information about the network as it maps its topology.
Captures and decodes packets.
BATTERY TYPE & LIFE Internal and external lithium-ion batteries give about 3.5 hours of continuous use.
 PRODUCT   Fluke OneTouch Series II Network Assistant
PRICE $4,200
CABLE TESTS Measures cable length.
Shows cable’s wire map.
Detects split pairs, opens and short circuits.
Enter custom NVP values to test other cables besides Category 5/6E.
XDSL option for testing DSL connections.
NETWORK TESTS Autotest function discovers network devices and displays icon-labeled counts of IP servers, NetBIOS servers, VoIP servers, VoIP endpoints, VoIP gateways, network printers, subnets, SNMP responders, NetWare servers, switches, hubs, local stations and remote stations.
Touching an icon shows detail such as IP address, MAC address, DNS name, SNMP data, line speed, half/full duplex, domain name, frame counts, broadcast counts, error counts and subnet masks.
Pings devices via ICMP packets, traces routes to devices and queries devices via SNMP.
BATTERY TYPE & LIFE Nickel hydride battery provides about 2.5 hours of continuous use.
 PRODUCT   Agilent FrameScope
PRICE $6,000 plus $2000 for optional DualRemote 350
CABLE TESTS Determines cable length.
Can test Category 5E, 6 and other (custom) cables in either link configuration or channel configuration.
Cable certification requires DualRemote 350; tests show pass/fail indication plus specific numbers for attenuation, NEXT, return loss, ELFEXT and PSNEXT.
NETWORK TESTS Discovers network devices and displays a list of discovered stations.
Pings devices, traces routes to devices, and queries devices via SNMP
Shows a range of statistics, generates specified levels of network traffic, and performs MAC loopback tests.
Locates a cable’s hub or switch port by blinking its LED.
Tracks network errors such as short frames or jabbering network adapters.
Manages the database of network devices, storing it in firmware.
Multiple autotest suites let you put sets of network devices in named groups for separate testing.
BATTERY TYPE & LIFE Both units come with a nickel hydride battery; about 3 hours of continuous use.
 PRODUCT   Psiber Pinger
PRICE $350
CABLE TESTS Polarity, line speed and link light activation
NETWORK TESTS Emits ICMP ping packets to test IP connectivity to one to eight network devices.
Verifies DHCP client connectivity.
Displays success or failure of the operation, round-trip time for the packets and indicates whether the received packets match the contents of transmitted packets or if packets were damaged in transit.
BATTERY TYPE & LIFE 4 double-A alkaline batteries, about 10 to 12 hours of continuous use.

Fluke's NetTool

The NetTool can run cable tests to determine problems such as cable length and whether a wire is broken. Attaching the supplied wiremap adapter to the far end of a cable lets you see whether the cable is wired correctly. NetTool also can show whether a network is using Token Ring or Ethernet, and can also detect a telephone company connection by displaying which pins are carrying tip and ring signals.

Inserting a NetTool between a network device and its hub or switch (it includes two RJ-45 ports) provides a lot of useful information about the device and its network connection. The device also can display the network device's name and IP, IPX and media access control addresses, along with the identity of servers and router gateways the device talks to.

NetTool has only one testing function, labeled autotest. Selecting it gave us a display showing detected problems, recognized protocols, and identified key devices and general network health. On a separate menu screen, NetTool offers a speedometer-style network utilization display and the ability to ping IP addresses.

Fluke's OneTouch Series II

Even more versatile than the NetTool, Fluke's OneTouch Series II Network Assistant is everything a handheld cable and network-testing device should be. Only its high price kept it from the top spot.

The cable-test mode included similar cable tests of the NetTool, but it also lets users enter custom Nominal Velocity of Propagation (NVP) values to test cables other than Category 5/6E. It also has an xDSL option for testing DSL connections.

The OneTouch network diagnostics are comprehensive. The autotest function discovers network devices and displays the result as icon-associated counts. Touching an icon brings up multiple levels of considerable detailed information.

Like the NetTool, OneTouch recognizes protocols to identify devices as IP servers, routers or other devices. Also like the NetTool, OneTouch has two RJ-45 ports, so the unit can be inserted between a network device and its network connection. The OneTouch can ping devices via ICMP packets, trace routes to devices and query devices via SNMP.

Agilent's FrameScope

Agilent's FrameScope initially enters cable-test mode and shows the length of the cable it's connected to, among other tests. It also can let you modify details such as wire pairings for Category 5E and 6, but not NVP values. FrameScope's cable certification tests require the DualRemote 350 option, a $2,000 separate unit connected to the other end of a cable.

Touching the network icon switches the FrameScope to network test mode. In this mode, FrameScope offers a plethora of diagnostic functions. In contrast to NetTool's single autotest function, FrameScope can have multiple autotest suites. Each suite represents a collection of one or more network devices you want to test. Each time a test is run, you can specify which suite to use, the number of times to iterate the test and the number of minutes to pause between iterations. The FrameScope displays network utilization and frame (by unicast, broadcast, multicast and error categories) counts and percentages along with protocol (by IP, IPX and other categories) counts and percentages.

FrameScope's station list shows each device's IP address and DNS name for the stations, servers, routers and remote stations it discovers on the network. Selecting a network device from the list reveals details about that device, such as frame counts and percentages categorized by type of frame - unicast, broadcast, multicast and error.

Fluke's OptiView Network Analyzer

If your company can afford it, Fluke's OptiView Network Analyzer is the ultimate cable-testing and network-diagnostic tool. The OptiView's cable-testing feature had basic tests, including cable length, wiremap information, short circuits and the like. The Ethernet Pro Gigabit model can check 10/100M bit/sec and Gigabit Ethernet nets.

The OptiView's network diagnostics rival those of a full-blown protocol analyzer. It shows multiple port switch statistics on one screen, which lets you compare switch port traffic levels at a glance. The multiport router display is similarly useful. The OptiView graphically reveals network utilization details, device discovery, network discovery, protocol statistics, problem discovery and recognized events. The device also can generate traffic, map topology and capture and decode packets.

Psiber Pinger Network IP Test Tool

Psiber's Pinger Network IP Test Tool is a simple device with a single purpose. It emits ICMP "ping" packets to test IP connectivity to one to eight network devices. The Pinger displays the success or failure of the operation, the round-trip time for the packets and an indication of whether the contents of the received packets match the contents of the transmitted packets or whether the packets were damaged in transit.

Odds and ends

Except for the Pinger, all the units we tested can transfer test results into a PC via a serial link. In each case, getting the transferred data into a spreadsheet or database for further analysis and reporting is completely painless.

The NetTool's documentation consists of a user guide and quick-reference card, while the OneTouch comes with a user guide, "getting started" guide and a quick-reference card. Both sets of documentation were more than adequate.

Because the FrameScope is a relatively new product, its user manual was a preliminary draft and we noted a few glaring errors. For example, the manual said the FrameScope automatically polls your network and discovers devices when you power it on. We found that the unit powered up in cable test mode. The OptiView comes with a user guide and quick-reference "at a glance" card. The user guide is brief and doesn't discuss OptiView's many features with as much depth as we would have liked. The Pinger's documentation is an eight-page card-stock booklet that contains essential information but lacks a professional appearance.


Dropped packets, cable faults, failed network adapters, misconfigured devices and sluggish performance are client session killers. A tool that can reveal cable faults and network health is an essential requirement in any network administrator's first-aid kit. We recommend budget-conscious administrators take a close look at Fluke's NetTool. However, for those with lots of bucks to spend on diagnostic tools, we suggest the OneTouch unit.

NetTool Connectivity Tester


Company: Fluke Networks, (425) 446-4519, Cost: Starts at $900. Pros: Offers essential cabling and network health tests for an excellent price. Cons: User interface isnít as pretty as that of the other products.
OneTouch Series II Network Assistant

Company: Fluke Networks, (425) 446-4519, Cost: Starts at $4,200. Pros: Sports more features than NetTool, includes a cool touch-screen interface. Cons: Remaining battery life icon needs to be more prominent.
OptiView Network Analyzer


Company: Fluke Networks, (425) 446-4519, Cost: Starts at $13,000. Pros: The ultimate network diagnostic tool; nice touch-screen Windows interface with protocol-analysis functions and a cable-testing capability. Cons: Pricey; documentation lacks depth.
FrameScope 350 with DualRemote 350 option (necessary for cable tests)


Company: Agilent Technologies, (877) 424-4536, http://wirescope. (800)255-4101 Cost: FrameScope costs $6,000, DualRemote option costs $2,000. Pros:Color touch-screen interface, compre-hensive network diagnostics. Cons: Pricey, especially with Dual- Remote option.
Pinger Network IP Test Tool


Company: Psiber Data Systems, (619) 287-9970, Cost: $350 Pros: Low cost, easy to use. Cons: Only performs ping operations to diagnose connectivity.

NetTool OneTouch OptiView FrameScope* Pinger
Administration 20%  5 5 5 5 5
Documentation 10%  4 4 4 4 2
Range of tests 20%  5 5 5 5 2
Reports 20%  5 5 5 4 3
Ease of use 15%  5 3 2 3 4
Price 15%  5 5 4 4 3
TOTAL SCORE  4.8 4.5 4.25 4.25 3.15
Individual category scores are based on a scale of 1 to 5. Percentages are the weight given each category in determining the total score. Scoring Key: 5: Exceptional showing in this category. Defines the standard of excellence; 4: Very good showing. Although there may be room for improvement, this product was much better than the average; 3: Average showing in this category. Product was neither especially good nor exceptionally bad; 2: Below average. Lacked some features or lower performance than other products or than expected; 1: Consistently subpar, or lacking features being reviewed. *Denotes router-only products.


Nance, a software developer and consultant for 29 years, is the author of Introduction to Networking, 4th Edition and Client/Server LAN Programming. He can be reached at

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