FS S3910-24TF Operating manual

S3910-24TF & S3910-48TF
Switches Hardware Installation
and Maintenance Guide
V1.0.2306A
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Preface
Audience：
This document is intended for network engineers responsible for S3910-24TF &
S3910-48TF switches installation and maintenance. You should have experience
in network device installation and maintenance.
Feature Statement：
Please visit the FS.COM Technical Documents page to download the datasheet
and obtain information on the specifications supported by the product.
Safety Statement:
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To avoid harm to people and equipment, please read the safety
recommendations in the Safety Precautions for FS Switches before
installing the FS Switch.
Verify that the requirements described in the Safety Precautions for FS
Switches have been met.
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Contents
1. Hardware Installation and Parts Replacement
1.1 Installation Procedure
1.2 Installation Preparation
1.3 Installing a Switch
1.4 Connecting a Switch
1.5 Post-Installation Checks
1.6 System Commissioning
1.7 Parts Replacement
2. Troubleshooting After Installation
2.1 Troubleshooting Flowchart
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2.2 Common troubleshooting

Hardware Installation and
Parts Replacement
S3910 series switch is FS.com's next-generation Gigabit Ethernet
switch, providing with full Gigabit downlink and fixed 10 Gigabit
uplink data interaction. This series of products adopt abrand-new
hardware architecture design, equipped with FS.com's latest
FSOS11.X modular operating system, offering larger resource
tables, faster hardware processing performance,and better
operational efficiency, providing you with a completely new
experience. At the same time, it has various routing features such
as static routing, RIP, OSPF, etc., making it fully capable of meeting
the aggregation layer equipment requirements in various network
environments of different scales, supporting low latency and
complete data center features.
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Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
1.1 Installation Procedure
Installation
Preparation Mounting the Host
on the Cabinet
Mounting the Host
on the Cabinet
Connecting the System
to the Grounding
Bundle the Cables
or Optical Cables
Connecting External Interface
Cables or Optical Cables
for Each Module
Inserting Various
Types of Modules
Connecting the
Power Supply
Post-Installation Checks End
1.2 Installation Preparation
Confirm the following before installation:
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The installation site provides sufficient space for heat dissipation.
The installation site meets the temperature and humidity requirements of the switch.
The power supply and required current are available in the installation site.
The Ethernet cables have been deployed in the installation site.
1.2.1 Carefully Read the Security Precautions
When installing, please note the following:
•Use power cables of corresponding colors to connect to the respective terminals.
•Ensure a good connection between the power supply cable interface and the device's power interface.
After inserting the power cable, secure it with a cable clamp to prevent detachment.
•Prohibit placing any objects on top of the device.
•Ensure sufficient ventilation space (at least 10 centimeters) around the device for proper heat
dissipation. Do not place them in piles.
•Keep the switch away from high-power radio transmitters, radar transmitters, and high-frequency
high-current equipment. If necessary, use electromagnetic shielding methods, such as using shielded
cables for interface connections.
•The hundred-meter Ethernet cable should be routed indoors and outdoor routing is prohibited. If
outdoor routing is necessary, please take appropriate lightning protection measures.

Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
1.2.2 Checking the Installation Site
The S3910-24TF & S3910-48TF switches must be used indoors. To ensure normal operations and long
service life of the device, the installation site must meet the following requirements.
Item Requirement
Cleanliness The device must be installed in a clean, dry, and well ventilated standard equipment room with
controllable temperature.
Dust proofing
Dustproof measures must be taken in the site. Dust will cause electrostatic discharges on the chassis
and affect connections of metal connectors and joints. This shortens service life of the device and may
cause failures of the device.
Temperature and
humidity
The equipment room must be free from leaking or dripping water, heavy dew, and damp. The temperature
and humidity in the installation site must be within specifications. For the operating temperature and
relative humidity ranges required by the device, see the device specifications. If the relative humidity
exceeds 70%, using dehumidifiers or dehumidifying air conditioners is recommended.
Corrosive gases
avoidance The installation site must be free from acidic, alkaline, or corrosive gases.
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1.2.3 Checking the Cabinet or Rack
When mounting the cabinet, please note the following:
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All expansion bolts for fastening the cabinet base to the ground should be installed and tightened in
sequence from bottom to up (large flat washer, spring washer, and nut), and the installation holes on
the base and the expansion bolts are aligned.
The installed cabinet is not movable after installation.
The installed cabinet is vertical to the ground.
When multiple cabinets are placed side by side in the equipment room, they should be aligned with
each other, leaving an error less than 5mm (0.20 in.).
The front and rear doors of the cabinet should be installed to allow you open and close them
smoothly. The locks should work normally, and all keys should be complete.
There should be no unnecessary and informal labels inside the cabinet and on service modules.
Filler panels are installed in empty slots.
The screws in the cabinet should be fastened tightly and be of the same model.
The switch is securely installed, and the screws on the panel should be fastened tightly.
All wiring outlets at the top and bottom of the cabinet should be installed with rodent-resistant nets
with openings of no more than 15mm (0.59 in.) in diameter to prevent rodents and other small
animals from entering the cabinet.
An anti-static wrist strap should be provided in the cabinet.

Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
Procedure:
1. Plan the available space before installing the cabinet. Maintain a clearance before the front and back
doors for maintenance and operation.
2. Install and fasten the cabinet in the specified site as planned.
3. Install the cable troughs and cables.
4. Install the trays and cable management brackets on the rack according to the number of switches
installed into the cabinet.
1.2.4 Checking the Power Conditions
•Before use, please check whether there is obvious damage to the power supply shell and whether the
power supply is defective such as abnormal noise.
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The device is only allowed to be plugged into the power module that accompanies the device, otherwise it
may lead to unknown risks.
Power module in 1+1 backup can be hot-swapped one of them, need to ensure that the other power
module on the equipment is in the power supply state when replaced, otherwise unplugging the power
module will cause the switch to lose power, resulting in business interruption.
1.2.5 Preparing Installation Tools and Accessories
Common Tools Phillips screwdriver, Ethernet and optical cables, cage nuts, diagonal pliers and cable ties
Special Tools Anti-static gloves, wire stripper, crimping plier, RJ45 connector crimping plier, and wire cutter
Cleaning Tools Dust-free paper and fiber end-face microscope
Meters Multimeter, bit error rate tester (BERT),and optical power meter
•S3910 series switches are delivered without a tool kit. You need to prepare a tool kit by yourself.
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Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
1.3 Installing a Switch
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The S3910-24TF & S3910-48TF switches can be installed in a standard 19-inch EIA rack. The installation
process is as follows：
Step 1：Remove the screws (included in the bracket packaging), and attach one end of the bracket to
the switch, as shown in Figure 1.
Figure 1: Rack-Mount Bracket Installation Diagram 1
1.3.1 Mounting the Switch in a Cabinet or Rack
Step 2：As shown in Figure 2, place the switch horizontally in the appropriate position within the rack.
Use M6 screws and the provided floating nuts to secure the other end of the rack -mount brackets to the
front mounting holes of the rack. The installation is completed as shown in Figure 2.
Figure 2: Rack-Mount Bracket Installation Diagram 2

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Figure 3: Rack-Mount Bracket Installation Diagram 3
1.3.2 Mounting the Switch on a Workbench
In most cases, users do not have a standard 19-inch rack. Therefore, the most common method is to place the
switch on a clean workbench. This operation is relatively simple, and the specific installation process is as
follows:
1. Attach four rubber pads to the four corners on the switch bottom, as shown in Figure 4.
2. Place the switch on the workbench to allow for adequate airflow.
1.3.3 Mounting the Switch on a wall
•When drilling holes on the wall, ensure there are no electrical circuits, water lines, or gas pipelines to
avoid personal injury.
•Avoid placing flammable and explosive materials above and below the equipment. Keep a distance of at
least 1 meter around the product free from obstructions.
•When mounting the device on the wall, ensure that the side without openings faces upwards to prevent
water from entering and damaging the device.
Figure 4: Desktop Installation Diagram 1

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Switch Hardware Installation and Maintenance Guide
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•Ensure that the installation screws are firmly secured. Inadequate fastening may cause the device to fall
and result in damage or injury when cables are connected.
•Avoid placing the switch in areas with vibration, impact, or instability. Do not install the switch at a height
where it may cause injury or damage.
•Pay attention to securing the external cables connected to the switch during installation to prevent the
switch from detaching due to cable weight.
The included mounting brackets of the S3910-24TF & S3910-48TF switches support wall-mount mode.
The installation process is as follows:
Step 1: Remove the screws (included in the front bracket packaging), and attach one end of the mounting
bracket (rotated 90 degrees) to the switch, as shown in Figure 5.
Figure 5: Wall-Mount Bracket Installation Diagram 1
Step 2: Secure the switch to the wall using expansion screws, as shown in Figure 6.
Figure 6: Wall-Mount Bracket Installation Diagram 2

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Switch Hardware Installation and Maintenance Guide
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The rear panel of the S3910-24TF & S3910-48TF switches hosts a grounded protective point . It should be
connected to the grounding terminal of the rack first , and then the rack 's grounding terminal should be
connectedtothegroundingbusbarofthe data center.
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To guarantee the security of the person and the equipment, the switch must be grounded properly.
The grounding resistance between the chassis and the ground should be less than 1Ω.
The maintenance personnel should check whether the AC socket is reliably connected to the
protective ground of the building. If not, the maintenance personnel should use a protective ground
conductor from the AC outlet protective ground terminal to the building protective ground.
The power socket should be installed near the equipment and easily accessible.
When installing the switch, connect the grounding first and disconnect it last.
The cross-sectional area of the protection ground wire should be at least 2.5mm (12AWG).
Precautions:
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The sectional area of the grounding wire should be determined according to the possible maximum current.
Cables of good conductors should be used.
Do not have bare wires exposed.
Grounding resistance: Less than 1Ω.
1.4 Connecting a Switch
1.4.1 Connecting Power Cables
•To avoid electric shock, do not connect the power cable while the power is on.
•Before connecting cables, take ESD protection measures, for example, wear ESD gloves or an ESD
wrist strap.
•Power cables must be buried underground or routed indoors and cannot be led into the equipment
room aerially.
•Do not power on a switch before you finish installing the switch and connecting cables.
Procedure：
•Wear an ESD wrist strap or ESD gloves. Ensure that the ESD wrist strap is grounded and in close
contact with your wrist.
•Turn off the external power supply system for the switch.
•Connect the power cable to the power port.
Perform the following steps to connect the AC power cable:
Insert the plug of the AC power cable into the power socket in the AC power module.

Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
1.4.3 Installing an Optical Module
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Before the installation, take ESD protection measures, for example, wear an ESD wrist strap or ESD gloves.
Do not touch the edge connector of an optical module during the installation.
Install an optical module, and then connect optical fibers to the optical module. Do not insert an optical
module with optical fibers to an optical port directly.
Cover idle optical ports with dust plugs. All optical ports on a newly delivered switch are covered with dust
plugs.
When inserting an optical module to a port, hold the optical module horizontally. If the optical module
cannot be completely inserted into the optical port, do not force it into the port. Turn the optical module
180 degrees over and try again.
Procedure:
1. Wear an ESD wrist strap or ESD gloves. Ensure that the ESD wrist strap is grounded and in close contact
with your wrist.
2. Remove the dust plug from an optical port. Keep the dust plug for future use.
3. Install the optical module to the optical port. Gently push the optical module into the optical port until you
hear a click.
4. Check whether the optical module is securely seated in the optical port.
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Connect the other end of the AC power cable to the external AC power supply system.
1.4.2 Connecting Ethernet Cables
Connect the RJ45 connector of an Ethernet cable to the management port on the equipment,
and the other end to a network management switch or terminal.
Figure 7:Connecting the AC Power Cable

Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
Keep the handle of the optical module closed, use your thumb and forefinger to hold two sides of the optical
module, and gently pull the optical module.
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If the optical module is not pulled out, it has been correctly installed.
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Figure 8: Installing an Optical Module
If the optical module is pulled out, it is installed incorrectly. Install the optical module again.
1.4.4 Connecting Optical Fibers
Insert the single-mode or multi-mode fiber into the corresponding interface according to the panel
identification, and distinguish the transmit and receive ends of a fiber cable.
1.4.5 Connecting High-speed Cables
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Before connecting cables, take ESD protection measures, for example, wear ESD gloves or an ESD wrist
strap.
Both ends of an idle high-speed cable must be covered by an ESD cap.
The bend radius of high-speed cables must be larger than the minimum bend radius. Overbending high-
speed cables may damage wires in the cables.
Procedure:
1. Determine the number and type of ports to be connected and plan the cabling routes.
2. Select high-speed cables of appropriate quantity and lengths according to the number of ports and
measured cabling distances.
3. Wear an ESD wrist strap or ESD gloves. Ensure that the ESD wrist strap is grounded and in close contact
with your wrist.

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Switch Hardware Installation and Maintenance Guide
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4. Attach temporary labels to both ends of each high-speed cable and write numbers on the labels to
identify the high-speed cables.
5. Connect high-speed cables to ports of the switch.
- Find the ports matching the numbers on the high-speed cables and plug cable connectors to the ports.
After verifying that all high-speed cables are correctly connected, go to 6.
- Hold a high-speed cable connector in a correct direction when inserting it into a port. When you hear a click,
the high-speed cable is securely connected to the port. See Figure 9.
Figure 9: Connecting a High-speed Cable
To remove a high-speed cable, gently push the cable connector and then pull the handle of the connector. Do
not directly pull the cable connector with force. See Figure 10.
Figure 10:Removing a High-speed Cable
6. Bundle high-speed cables. Arrange the high-speed cables to make them parallel, and then bundle them
with cable ties at an interval of 150mm to 300mm. Use diagonal pliers to cut off redundant cable ties.
7. Replace all the temporary labels with permanent labels on the high-speed cables.

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Switch Hardware Installation and Maintenance Guide
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To guarantee the security of the person and the equipment, the switch must be grounded properly.
The grounding resistance between the chassis and the ground should be less than 1Ω.
The maintenance personnel should check whether the AC socket is reliably connected to the
protective ground of the building. If not, the maintenance personnel should use a protective ground
conductor from the AC outlet protective ground terminal to the building protective ground.
The power socket should be installed near the equipment and easily accessible.
When installing the switch, connect the grounding first and disconnect it last.
The cross-sectional area of the protection ground wire should be at least 2.5mm (12AWG).
1.4.6 Connecting the Grounding Cable
There is one ground terminal on the back of the N8560-48BC switch chassis, which should be connected to
the grounding lug of the rack first, and then connect the grounding lug to the grounding bar of the equipment
room.
Precautions:
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The sectional area of the grounding wire should be determined according to the possible maximum current.
Cables of good conductors should be used.
Do not have bare wires exposed.
Grounding resistance: Less than 1Ω.
•By default, the baud rate is 9600, data bit 8, parity check none, stop bit 1, and flow control none.
1.4.7 Connecting the Console Port
Connection Steps:
Connect the RJ45 connector of an Ethernet cable to the console port of the switch, and connect the DB9
connector to a network management switch or terminal.
1.5 Post-Installation Checks
•Cut off the power supply to avoid personal injury and damage to components caused by incorrect
connection.

Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
1.6 System Commissioning
1.6.1 Setting Up the Configuration Environment
Connect the PC to the console port of the switch through the Ethernet cable, as shown in the figure below.
Figure 11:Configuration Environment
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•The grounding cables are connected properly.
•The UTP and STP cables match with the interface type.
•All cables are routed indoors. If not, check whether the power supply and interfaces are protected
from lightning strikes.
•Maintain a minimum clearance of 10cm around the switch for air circulation.
Step 1: Connecting the Ethernet Cable
1. Plug the DB-9 connector of the Ethernet cable into the serial port of the PC.
2. Connect RJ45 connector of the Ethernet cable to the console port of the switch.

Hardware Installation and Parts Replacement
Switch Hardware Installation and Maintenance Guide
Step 2: Check the Serial Port Number
Open Device Manager on the computer and check the serial port number.
Step 3: Start Terminal Emulation Software on the Computer (Such as PUTTY)
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Switch Hardware Installation and Maintenance Guide
Step 4: Setting Terminal Parameters
Parameter requirements:
Baud rate is 9600, connection type is Serial, fill in COM port number according to the actual situation. The
specific diagram is as follows.
Figure 12:Setting Terminal Parameters
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1.6.2 Powering On the Switch
Checklist before Power-On
•The switch is fully grounded.
•The fan module and the power module are properly installed.
•Check if the power cord is properly connected.
•The power supply voltage matches the requirement.
•The Ethernet cable is properly connected. The terminal (it can be a PC) used for
configuration is already started. The parameters are already configured.
Checklist after Power-On
After power-on, check the following:
•Check whether there is message printed on the terminal interface.
•Check the LED status.

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Switch Hardware Installation and Maintenance Guide
1.7 Parts Replacement
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1.7.1 Replacing a Optical Module
When replacing the optical module, pay attention to the following requirements:
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Anti-static preparations must be made before replacement.
Laser beams will cause eye damage. Do not look into bores of optical modules or optical fibers without eye
protection.
Ensure that the new optical module has the same center wavelength and complies with the same
standards as the old one.
After removing the optical fibers from an optical module, cover the fiber connectors with dust caps.
When replacing an optical module, ensure that no optical fiber is connected to the optical module. Install
or remove optical fibers carefully to avoid damages to fiber connectors. Exercise caution when installing or
removing optical fibers to prevent damage to the optical module.
Procedure:
1. Wear an ESD wrist strap or ESD gloves. When wearing an ESD wrist strap, ensure that the ESD wrist strap
is in close contact with your wrist, and insert the other end into the ESD jack of the device or cabinet/rack.
2. Before replacing an optical module, determine in which cabinet and chassis the optical module is installed,
find the optical module in the chassis, and attach a label to the optical module. Record optical fiber
locations on the optical module to be replaced and check whether the labels on the optical fibers are
correct and clear. If any label is unclear, make and attach a new label to the optical fiber to ensure correct
connection.
3. Rotate the handle of the optical module down, gently push the optical module, and then pull out the
optical module by the handle. Remove the optical fibers from the optical module and cover them with
dust caps.
- Two types of latches on fiber optic connectors:
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LC/PC connector, opened by pressing the buckle, as shown in Figure 13.
MPO connector, opening automatically when the buckle is pulled, as shown in Figure 14.

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Switch Hardware Installation and Maintenance Guide
Figure 13:LC/PC Connector
Figure 14:MPO Connector
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4. Pull out the optical module, plug the dustproof plug and dispose of it.
- There are two types of buckles on the optical module. A pull-rod handle that needs to be turned over to
open, as shown in Figure 15. The other is a handle-type handle, which is automatically opened during the
process of pulling the handle, as shown in Figure 16.
Figure 15: Pull-rod Handle