Installation Guide for
10/100BaseT Port Aggregator Tap
with Active Response
Models PA-CU-AR, PAD-CU-AR
Doc. PUBPACUARU Rev. 1, 06/06
10/100 Port Aggregator Tap
Contents
Introduction. 1
Key.Features. 3
Unpacking.and.Inspection. 4
Product.Diagrams. 4
LED.Indicators. 5
Application.Diagrams:.Memory.Operation . 6
Cabling.Guidelines. 8
Connecting.to.the.Network. 8
Connecting.to.the.Monitoring.Device(s) . 9
DIP.Switch.Settings . 10
Active.Response.Tap.FAQs . 11
Specifications. 13
Limitations.on.Warranty.and.Liability. 14
10/100 Port Aggregator Tap
PLEASE READ THESE LEGAL NOTICES CAREFULLY.
By.using.a.Net.Optics.Tap.you.agree.to.the.terms.and.conditions.of.usage.set.forth.by.Net.Optics,.Inc
No.licenses,.express.or.implied,.are.granted.with.respect.to.any.of.the.technology.described.in.this.
manual .Net.Optics.retains.all.intellectual.property.rights.associated.with.the.technology.described.in.
this.manual .This.manual.is.intended.to.assist.with.installing.Net.Optics.products.into.your.network
Trademarks and Copyrights
©.2007.by.Net.Optics,.Inc .Zero.DelayTM.Net.Optics®.is.a.registered.trademark.of.Net.Optics,.Inc .
Additional.company.and.product.names.may.be.trademarks.or.registered.trademarks.of.the.individual.
companies.and.are.respectfully.acknowledged
Additional Information
Net Optics, Inc. reserves the right to make changes in specifications and other information contained
in.this.document.without.prior.notice .Every.effort.has.been.made.to.ensure.that.the.information.in.this.
document.is.accurate .
10/100 Port Aggregator Tap
Introduction
Net.Optics.10/100.Dual.Port.Aggregator.Taps.with.Active.Response.provide.
ultra-efficient access to critical links with the option to inject an active re-
sponse.into.the.network .This.pioneering.technology.enables.any.two.devices.
to.simultaneously.monitor.a.full-duplex.link.-.using.only.one.NIC.per.device
Typically,.full-duplex.monitoring.with.a.network.tap.requires.two.NICs.(or.
a.dual.channel.NIC).–.one.interface.for.each.side.of.the.tapped.full-duplex.
connection .The.Dual.Port.Aggregator.Tap.combines.and.regenerates.these.
streams,.sending.all.aggregated.data.out.two.separate.passive.monitoring.
ports .The.best.part.of.this.innovation.is.the.onboard.memory.to.make.sure.
traffic isn’t dropped during bursts.
Response Ready
When active responses to network events are required, the first monitoring
port.can.be.changed.to.an.Active.Response.Port.using.a.hardware.switch .The.
Active.Response.Port.buffers.and.transmits.into.the.network.link.any.type.
of.Ethernet.packet,.from.a.simple.TCP.reset.to.ICMP.messages .The.Active.
Response.Port.can.be.easily.switched.back.to.passive.monitoring.via.the.
hardware.switch .
The.combination.of.active.response.capability.and.passive.monitoring.in.
the.Tap.reduces.the.number.of.devices.and.network.ports.required.for.active.
response.functionality
Buffering Prevents Lost Data
The.Dual.Port.Aggregator.Tap.with.Active.Response.is.designed.to.handle.the.
combined traffic of a single full-duplex link. Normally, the traffic should be
below.the.receiving.capacity.of.the.NIC,.that.is,.less.than.10.or.100.Mbps
When the traffic queue exceeds the capacity of the NIC, the Tap buffers the
overflow of up to one megabyte per side of the full-duplex connection. For
your convenience, the buffers clear automatically when the traffic volume falls
below the receiving capacity of the NIC. For example, if there is a traffic burst
and.a.tap.connected.to.a.100.Mbps.network.port.on.a.monitoring.device.is.
now receiving 140 Mbps of traffic, the Tap buffers data until the burst is over.
The.Tap.then.sends.the.buffered.data.to.the.monitoring.device.until.the.buffer.
is.cleared
1
10/100 Port Aggregator Tap
Simple to Deploy
Net Optics’ Dual Port Aggregator Tap with Active Response is a simple plug-
and-play.solution.addressing.the.fact.that.many.monitoring.systems,.including
most.software.based.solutions,.only.offer.a.single.channel.NIC,.limiting.full-
duplex.visibility .While.adding.a.second.NIC.can.help.maintain.data.integrity.
and visibility, there is a tradeoff in flexibility and ease-of-use. An operating
system.and.NICs.that.enable.binding.are.often.required.to.achieve.the.same.
functionality.as.the.Dual.Port.Aggregator.Tap .In.contrast,.the.Dual.Port.
Aggregator Tap requires no additional components or configuration on the
monitoring.devices .
All.network.and.monitoring.cables.required.for.plug-and-play.deployment.are.
included.with.the.10/100BaseT.Dual.Port.Aggregator.Tap.w/Active.Response
Better than Span Ports
In the past, span ports were occasionally used to aggregate tapped traffic.
However,.in.addition.to.other.shortcomings.of.span.port.monitoring,.span.
ports.support.very.limited.buffering.and.can.simply.drop.data.during.bursts .
The.generous.buffers.of.the.Dual.Port.Aggregator.Tap.prevent.data.loss.in.
these.conditions
Security and Visibility
Without.an.IP.address,.monitoring.devices.are.isolated.from.the.network,.
dramatically.reducing.their.exposure.to.attacks .However,.the.monitoring.
device connected to the Tap still sees all full-duplex traffic as if it were in-line,
including.Layer.1.and.Layer.2.errors
Reliability
For.extra.uptime.protection,.Net.Optics.Taps.offer.redundant.power.connec-
tions .Should.the.primary.power.source.fail,.the.Tap.automatically.switches.
to.the.backup.power.source .Power.LEDs.on.the.front.of.the.Tap.indicate.the.
current.power.source
ꢀ
10/100 Port Aggregator Tap
Key Features
Passive, Secure Technology
• Supports.full-duplex.monitoring.with.a.single.NIC,.increasing.monitoring.
efficiency
• Regeneration.Tap.technology.enables.two.devices.to.simultaneously.moni-
tor all aggregated traffic – using only one NIC per device
• One.megabyte.of.memory.for.each.side.of.the.full-duplex.link.(two.mega-
bytes memory, total) prevents data loss during excessive traffic loads
• Provides.complete.full-duplex.visibility.at.10.or.100.Mbps.without.data.
stream.interference.or.introducing.a.point.of.failure
• No.IP.address.is.needed.for.the.Tap.or.monitoring.device,.enhancing.moni-
toring.security
• Compatible.with.Mid-Span.Power.over.Ethernet.(PoE).applications
• Redundant.power.ensures.monitoring.uptime
• Fully.RoHS.compliant
Enhanced, Efficient Monitoring
• Active response capability increases Tap-based monitoring flexibility and
efficiency
• Hardware.switch.provides.a.secure.transition.between.passive.mode.(trans-
mit.only).and.active.mode.(transmit/receive).for.the.Active.Response.Port
Ease of Use
• LED.indicators.show.redundant.power,.speed,.link,.and.activity.status
• DIP switches select auto-negotiation or fixed speed and duplexing settings
for.the.Tap
• Front-mounted.connectors.support.easy.installation.and.operation
• Silk-screened.application.diagram.illustrates.all.connections.for.easy.
deployment
• Optional.19-inch.rack.frames.hold.up.to.three.Taps
• Tested and compatible with all major manufacturers’ monitoring devices,
including.protocol.analyzers,.probes,.and.intrusion.detection/prevention.
systems
Support
• Net.Optics.offers.free.technical.throughout.the.lifetime.of.your.purchase .
Our technical support team is available from 8 am to 5 pm Pacific Time,
Monday.through.Friday.at.+1.(408).737-7777.and.via.email.at.ts-support@
netoptics com .FAQs.are.also.available.on.Net.Optics.website.at.www
netoptics com
ꢁ
10/100 Port Aggregator Tap
Unpacking and Inspection
Carefully.unpack.the.10/100.Port.Aggregator.Tap.w/Active.Response.and.
check.for.damaged.or.missing.parts .The.Tap.ships.with.the.following:
• 10/100.Port.Aggregator.Tap.w/Active.Response
• Two.power.supplies
• Two.network.cables
• One.or.two.monitor.cables
• Installation.Guide
You.may.have.also.ordered.a.one.rack.unit.panel.for.mounting.three.Taps.and.
an.extended.warranty .Carefully.check.the.packing.slip.against.parts.received .
If.any.part.is.missing.or.damaged,.contact.Net.Optics'.Customer.Service.im-
mediately
Product Diagrams
Power LEDs
Monitor Port 1
Network Ports
A & B
A
B
1
®
Port Aggregator
2
with Active Response
1
10 LINK
100 ACT
10 LINK
10 LINK
100 ACT
100 ACT
Figure 1: PA-CU-AR Front Panel
Network Ports
A & B
Monitor Ports
1 & 2
Power LEDs
A
B
1
2
®
Dual Port Aggregator Tap
with Active Response
2
1
10 LINK
100 ACT
10 LINK
10 LINK
10 LINK
100 ACT
100 ACT
100 ACT
Figure 2: PAD-CU-AR Front Panel
ꢂ
10/100 Port Aggregator Tap
DIP Switch
Power DC Jacks
/
.
1
2
3
4
5
6
7
8
Figure 3: Rear Panel
LED Indicators
• PWR 1/ PWR 2:.Main.and.Redundant.Power .If.the.Tap.is.deployed.with.
both.power.supplies,.both.LEDs.will.illuminate.when.the.Tap.is.plugged.in .
If.an.LED.is.off,.this.indicates.that.the.corresponding.power.supply.is.not.
functioning
Additional.Port.Aggregator.Tap.LEDs.are.located.in.the.upper.left.and.right.
hand.corners.of.the.RJ45.connectors.for.Port.A,.Port.B,.Port.1.and.Port.2.
(PAD-CU-AR.only)
• 10/100 Indicator:.If.the.Port.is.set.to.10.Mbps,.the.LED.illuminates.or-
ange .If.the.Port.is.set.to.100.Mbps,.the.LED.illuminates.green .
• Link/Activity Indicators: If.a.good.link.is.established,.the.LED.illu-
minates.a.steady.green .If.there.is.current.activity.on.this.link,.the.LED.
flashes.
ꢃ
10/100 Port Aggregator Tap
Application Diagrams: Memory Operation
All traffic that passes through the Tap is sent to the monitoring device NIC on
a first-in, first-out basis, including traffic that is temporarily stored in memory.
(If.two.packets.enter.at.the.same.time.then.one.packet.is.processed.while.the..
other is stored briefly in memory, preventing collisions.)
When there is a burst of data, traffic in excess of the NIC's capacity is sent to
the.Tap's.memory .Up.to.one.megabyte.of.data.per.side.of.the.full-duplex..
stream can be stored in memory. Memory continues to fill until its capacity is
reached, or the burst ends – whichever comes first.
In both cases, the Tap applies a first-in, first out procedure, processing stored
data before new data from the link. If memory fills before the burst ends, the
memory stays filled as the stored data is processed – data that leaves the buffer
is immediately replaced. If the burst ends before the memory fills, memory
clears.until.the.full.megabyte.of.capacity.is.available,.or.until.another.burst.in.
excess.of.the.NIC's.capacity.requires.additional.memory
The.following.three.diagrams.illustrate.a.simple.example.of.a.100.Mbps.NIC..
moving.from.80.percent.utilization,.to.140.percent.utilization,.then.back.to.80.
percent.utilization .If.you.have.PA-CU-AR.model,.there.is.only.one.monitor.
port
State 1: Side A + Side B is less than or equal to 100%
of the NIC's receive capacity.
Example: On a 100 Mbps link, Side A is at 30 Mbps and Side B is at 50 Mbps.
The NIC receives 80 Mbps of traffic (80% utilization), so no memory is required
for the monitoring device NIC to process all full-duplex traffic.
Side A
Active Response Dual
Port Aggregator Tap
A
B
1
2
Router
Firewall
Side B
1
Each using a single NIC, the monitoring
devices both receive all combined traffic
from Side A and Side B, including physical
layer errors.
Side A +
Side B
Monitoring
Device 1
Monitoring
Device 2
Figure 4: 80% Utilization
6
10/100 Port Aggregator Tap
State 2: Side A + Side B becomes greater than 100%
of the NIC's receive capacity.
Example: There is a burst of traffic, so Side A is now at 90 Mbps while
Side B remains at 50 Mbps. The NIC's utilization is at 140%, requiring the
use of memory to help prevent data loss.
Side A
Active Response Dual
Port Aggregator Tap
A
B
1
2
Router
Firewall
Side B
Memory
1
Each using a single NIC, the monitoring
devices both receive all combined traffic
from Side A and Side B, including physical
layer errors.
2
The extra 40 Mbps of traffic is
stored in the 1 megabyte buffer
Side A +
Side B
for Port A. Memory continues to
fill until the 1 megabyte capacity
is reached, or the burst ends.
(A separate 1 megabyte buffer is
also available to handle a burst
on Port B.)
Monitoring
Device 1
Monitoring
Device 2
Figure 5: 140% Utilization
State 3: Side A + Side B is once again less than 100%
of the NIC's receive capacity.
Example: On a 100 Mbps link, Side A is again at 30 Mbps and Side B
remains at 50 Mbps. The NIC's utilization is again at 80%.
Side A
Active Response Dual
Port Aggregator Tap
A
B
1
2
Router
Firewall
Side B
Memory
2
Once the memory has cleared, each
monitoring device begins receiving new
data directly from the link. Each using
a single NIC, both monitoring devices
receive all traffic from Side A and Side B,
including physical layer errors.
1
Side A +
Side B
The Tap applies a first-in, first-out
process to all packets. Once the burst
has ended and the NIC's utilization is
again below 100 percent, the Tap first
processes the packets that were stored
in memory. As long as the NICʼs
Monitoring
Device 1
utilization remains below 100 percent,
this process continues uninterrupted
until the memory clears.
Monitoring
Device 2
Figure 6: Return to 80% Utilization
ꢄ
10/100 Port Aggregator Tap
Cabling Guidelines
Use.straight-through.cable.to.connect.the.Tap.Ports.to.a.Router.or.NIC .Use.
cross-over.cable.to.connect.the.Tap.Ports.to.Switches.and.Hubs .The.Tap.Ports.
Transmit.on.Pins.3.&.6.and.Receive.on.Pins.1.&.2
Note:________________________________________________________________
You must ensure that both Network Ports A and B match speed and duplex
settings on your network devices.
______________________________________________________________________
Connecting to the Network
1 . Connect.Network.Port.A.to.the.appropriate.network.device.following.the.
cabling.guidelines.above ..
2 ..Connect.Network.Port.B.to.the.appropriate.network.device.following.the.
cabling.guidelines.above .
3 . Verify.that.the.Tap.Network.Ports.are.cabled.in-line.between.two.devices
A
B
1
2
®
Passive Dual
2
Port Aggregator with
Active Response
1
10 LINK
100 ACT
10 LINK
10 LINK
10 LINK
100 ACT
100 ACT
100 ACT
To network switch or router
To network switch or router
Figure 7: Connecting to the Network
ꢅ
10/100 Port Aggregator Tap
Connecting to the Monitoring Device(s)
1 . Supply.power.to.the.Tap.using.the.power.supplies.included.with.the.unit .
Two.power.supplies.are.included .The.use.of.the.second.redundant.power.
supply.is.optional
Note:________________________________________________________________
The second power supply is available to support the flow of traffic to the moni-
toring device, in the event that the first power supply becomes unavailable. If
the first power supply is unavailable, the second power supply will supply all
power for the Tap. Even if no power is available to the passive Tap, network
traffic flows uninterrupted.
______________________________________________________________________
2. Verify that the Power LEDs illuminate. PWR 1 illuminates when the first
power.supply.is.in.use,.and.PWR.2.illuminates.when.the.second.power.
supply.is.in.use .Both.power.supplies.can.be.plugged.into.the.Tap.at.the.
same.time
3 . Connect.Monitoring.Port.1.to.the.appropriate.port.on.the.monitoring..
device.using.a.CAT5.RJ45.straight-through.cable.to.monitor.the.full-.
duplex.link
4 . If.you.are.installing.model.PAD-CU-AR,.connect.Monitoring.Port.2.to.the.
appropriate.port.on.the.monitoring.device.using.a.CAT5.RJ45.straight-
through.cable.to.monitor.the.full-duplex.link
A
B
1
2
®
Passive Dual
2
Port Aggregator with
Active Response
1
10 LINK
100 ACT
10 LINK
10 LINK
10 LINK
100 ACT
100 ACT
100 ACT
To monitoring device 1
To monitoring device 2 (96448)
Figure 8: Connecting to Monitoring Device(s)
ꢆ
10/100 Port Aggregator Tap
DIP Switch Settings
Switch
Function
Description
1
Turns Auto-negotiation ON If turned ON, ports A, B, and C/D automatically
or OFF. Factory default negotiate the links. Positions ꢀ thru ꢅ are inac-
setting is Auto-negotiation. tive.
To manually configure ports A, B, and C/D, turn
switch to the OFF position. Positions ꢀ thru ꢅ
are active.
ꢀ
ꢁ
ꢂ
ꢃ
6
ꢄ
ꢅ
Set Port A Duplex
ON for Half-Duplex; turn OFF for Full-Duplex
ON for 10 Mbps; turn OFF for 100 Mbps
ON for Half-Duplex; turn OFF for Full-Duplex
ON for 10 Mbps; turn OFF for 100 Mbps
ON for Half-Duplex; turn OFF for Full-Duplex
ON for 10 Mbps; turn OFF for 100 Mbps
Turns Active Response ON or OFF
Set Port A Speed
Set Port B Duplex
Set Port B Speed
Set Port 1 (and ꢀ) Duplex
Set Port 1 (and ꢀ) Speed
Active Response
Active
Response
AUTO
NEGOTIATE
A
B
C
ON HD 10 HD 10 HD 10 ON
OFF FD 100 FD 100 FD 100OFF
/
.
1
2
3
4
5
6
7
8
NOTE: To activate, push buttons UP.
(This diagram shows all segments
in the OFF position)
Figure 9: DIP Switch Settings
10
10/100 Port Aggregator Tap
Active Response Tap FAQs
Q: What types of active responses are supported?
A:.With.an.Active.Response.Dual.Port.Aggregator.Tap,.an.administrator.can.
transmit.any.type.of.Ethernet.packet.back.into.the.original.link,.supporting.all.
common.types.of.active.responses.generated.by.intrusion.detection.systems,.
and.by.intrusion.prevention.systems.deployed.in.passive.mode .The.most.
common response types are TCP resets, and firewall rule changes. While the
Tap.can.support.both.types.of.responses,.we.advocate.extreme.caution.in.dy-
namically updating firewall rules due to the risk of disabling network services.
Because most firewalls are managed out-of-band, however, it is unlikely that
the.Regeneration.Tap.will.be.part.of.a.rule.change.scenario .
Q: How are collisions avoided when active responses are transmitted back
into the original link?
A: On each side of the full-duplex link, there is a small buffer for traffic ar-
riving from the network, and another small buffer for active response traffic
arriving from the monitoring device. Traffic is released from this buffer pair
on a first-in, first-out basis. If both sides of the buffer are empty and a packet
originating.from.the.monitoring.device.and.a.packet.originating.from.the.
network.arrive.at.the.same.time,.priority.is.given.to.the.network.packet
11
10/100 Port Aggregator Tap
Active Response Tap FAQs (Continued)
Q: How much bandwidth is available on the Active Response Port?
A:.The.average.amount.of.bandwidth.for.active.responses.is.determined.by.
the.average.available.capacity.on.the.link .For.example,.on.a.100.Mbps.full-
duplex.link,.if.transmission.from.device.A.to.device.B.averages.30.Mbps,.and.
transmission.from.device.B.to.device.A.averages.at.50.Mbps,.then.there.is.an.
average capacity on the first side for 70 Mbps, and on the second side for up
to 50 Mbps of active response traffic.
At.any.particular.point.in.time,.actual.capacity.is.determined.by.the.size.of.the.
packets.being.transmitted.and.the.gap.between.these.packets .On.a.standard.
link with 64-byte network and active response traffic, the capacity at any point
in.time.will.be.very.close.to.the.average.capacity .(We.do.not.recommend.
using the Tap on links with jumbo packets as these large – up to 9K – packets
can fill the buffer and impact performance.)
As the most common use for the Tap will be to inject TCP resets, which are
standard.64-byte.packets,.it.is.unlikely.that.the.transmissions.from.either.side.
of.the.Active.Response.Port.will.exceed.10.Mbps,.even.if.many.sessions.are.
terminated.in.a.short.time.frame .In.our.internal.testing,.we.have.therefore.
focused.on.Active.Response.Port.performance.at.up.to.10.Mbps
Q: Does Active Response Port require the connected monitoring device to
have an IP address?
A:.Yes,.the.connected.monitoring.device.is.required.to.have.a.MAC.and.IP.
address.when.the.Active.Response.Port.is.operating.in.active.mode .These.are.
not.required.when.this.Port.is.set.to.passive.mode .The.Tap.itself.never.has.a.
MAC.or.IP.address,.regardless.of.how.the.Active.Response.Port.is.set
1ꢀ
10/100 Port Aggregator Tap
Specifications
Environment
Operating Temperature: 0˚C to 55˚C
Storage Temperature: -10˚C to 70˚C
Relative.Humidity:.10%.min,.95%.max,.non-condensing
Power
Power.Supply.Input:.100-240VAC,.0 5A,.47-63Hz
.
Output:.12V,.1 5A
Mechanical
Dimensions:.1 125”.high.x.9 125”.deep.x.4 5”.wide
Cable Interface
Copper.Cable.Type:.22-24.AWG.unshielded.twisted.pair.cable,.
.
Link.Distance.Supported:.100.meters
.
.CAT5/CAT5e
Connectors
(2).RJ45,.8-pin.connectors.(network.ports)
(1).RJ45,.8-pin.connector.(PA-CU-AR.monitor.port)
(2).RJ45,.8-pin.connectors.(PAD-CU-AR.monitor.ports)
Certifications
Fully.RoHS.compliant
1ꢁ
10/100 Port Aggregator Tap
Limitations on Warranty and Liability
Net.Optics.offers.a.limited.warranty.for.all.its.products .IN.NO.EVENT.SHALL.NET.OPTICS,.INC .
BE.LIABLE.FOR.ANY.DAMAGES.INCURRED.BY.THE.USE.OF.THE.PRODUCTS.(INCLUD-
ING.BOTH.HARDWARE.AND.SOFTWARE).DESCRIBED.IN.THIS.MANUAL,.OR.BY.ANY.
DEFECT.OR.INACCURACY.IN.THIS.MANUAL.ITSELF .THIS.INCLUDES.BUT.IS.NOT.LIM-
ITED.TO.LOST.PROFITS,.LOST.SAVINGS,.AND.ANY.INCIDENTAL.OR.CONSEQUENTIAL.
DAMAGES.ARISING.FROM.THE.USE.OR.INABILITY.TO.USE.THIS.PRODUCT,.even.if.Net.
Optics.has.been.advised.of.the.possibility.of.such.damages .Some.states.do.not.allow.the.exclusion.
or.limitation.of.implied.warranties.or.liability.for.incidental.or.consequential.damages,.so.the.above.
limitation.or.exclusion.may.not.apply.to.you
Net.Optics,.Inc .warrants.this.Tap.to.be.in.good.working.order.for.a.period.of.ONE.YEAR.from.the.
date.of.purchase.from.Net.Optics.or.an.authorized.Net.Optics.reseller
Should.the.unit.fail.anytime.during.the.said.ONE.YEAR.period,.Net.Optics.will,.at.its.discretion,.
repair.or.replace.the.product .This.warranty.is.limited.to.defects.in.workmanship.and.materials.and.
does not cover damage from accident, disaster, misuse, abuse or unauthorized modifications.
If.you.have.a.problem.and.require.service,.please.call.the.number.listed.at.the.end.of.this.section.and.
speak.with.our.technical.service.personnel .They.may.provide.you.with.an.RMA.number,.which.must.
accompany.any.returned.product .Return.the.product.in.its.original.shipping.container.(or.equivalent).
insured.and.with.proof.of.purchase
Additional Information
Net Optics, Inc. reserves the right to make changes in specifications and other information contained
in.this.document.without.prior.notice .Every.effort.has.been.made.to.ensure.that.the.information.in.
this.document.is.accurate .Net.Optics.is.not.responsible.for.typographical.errors
THE.WARRANTY.AND.REMEDIES.SET.FORTH.ABOVE.ARE.EXCLUSIVE.AND.IN.LIEU.OF.
ALL.OTHERS,.EXPRESS.OR.IMPLIED .No.Net.Optics.reseller,.agent,.or.employee.is.authorized.
to make any modification, extension, or addition to this warranty.
Net.Optics.is.always.open.to.any.comments.or.suggestions.you.may.have.about.its.products.and/or.
this.manual
Send.correspondence.to.
Net.Optics,.Inc .
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