
Techn olo gie s
Atop Technologies, Inc.
 Industrial DIN-Rail Unmanaged Ethernet Switch
EH2305-1Fm
 EH2305-1Fs
EH2306
EH2308
5/6/8-port Industrial Unmanaged Ethernet Switch
Hardware Installation Guide
Version 1.4
Updated on March, 2012
Introduction
Thank you for purchasing Atop EH-series Industrial Ethernet Switch. 
This document intends to provide customers with brief descriptions about 
the product and to assist our customers to get started using our devices. 
Inside the Package 
- Main Product
■
 One EH2305-1Fm, EH2305-1Fs, EH2306 or EH2308 device
- Standard Accessories
■
 Terminal block for power input
■
 The hardcopy of EH-series Hardware Installation Guide
- Optional Accessories
■
 US315-12(US), AC100V~240V 50/60HZ 12V/1.25A, US Plug (optional)
→ Atop PN:50500151120009G
■
 US315-12(EU), AC100V~240V 50/60HZ 12V/1.25A, EU Plug (optional)
→ Atop PN:50500151120019G
Product Description
EH2305-1Fm
5-Port Unmanaged Fast Ethernet Switch 
with Multi-mode Optical Fiber
■ 
4 ports of 10/100Base-TX with RJ-45 connector 
■ 
1 port of 100Base-FX Multi-mode Optical Fiber 
  with ST connector 
Data Link
Fault
P2
P1
F.G.
V-
V+
F.G.
V-
V+
90.6mm
P1
P2
3
Rx
5
Tx
4
F.G.
V-
V+
F.G.
V-
V+
90.6mm
3
1
Data Link
P2
FaultP1
P1
P2
45.4mm
Rx
5
Tx
4
2
EH2306
6-Port Unmanaged Fast Ethernet Switch
■ 
6 ports of 10/100Base-TX with RJ-45 connector
P2P2P1
V- V+ V- F.G.
V+
P1
87
90.6mm
65
43
21
  EH2308
90.6mm
P1 P2
Fault
F.G.
V-
P1
V+
F.G.
V-
P2
V+
3
1
45.4mm
8-Port Unmanaged Fast Ethernet Switch
■ 
8 ports of 10/100Base-TX with RJ-45 connector
45.4mm
Hardware Installation
Step1: Installation on “DIN-Rail”
■ 
All EH23xx Switches are equipped with a DIN-Rail bracket attached 
  onto the rear panel. Please follow the below steps to fasten the 
  switch to the DIN-Rail correctly.
■ 
Tip the switch forward and press it against the DIN-Rail after align 
  the bracket springs to the DIN-Rail.
■ 
Press the bracket against the upper ledge of the DIN-Rail until it 
  clicks. 
Step2: Connecting the Power
■ 
Prepare the suitable power source and connect it into EH Switch
  by Terminal Blocks (TB3/TB5).
6
■ 
DC 9-30V for EH2305-1Fm, EH2305-1Fs and EH2306 switch
  products.
■ 
DC 9-48V for EH2308 switch product.
■ 
5
You can connect two DC inputs for EH switch power if auto-backup
  needed.
■ 
Check P1/P2 power LED. The LED(s) will be lighted when the 
4
  device is ready.
3-pin Terminal Block for Power Input
F.G.
2
Pin 
Signal
V-
V+
V+            V-            F.G.
DC9-30V           0V        Frame Ground
5-pin Terminal Block for Power Input
P2 P1
V+
V- V+ V- F.G.
Pin 
Signal
V+            V-            F.G.
DC9-48V           0V        Frame Ground
Warning:
Before connecting EH23xx to the DC power input, please make sure 
the DC voltage supplied by the power source is correct and stable. 
Step3: Connecting the Network Devices
■ 
Connect your devices using standard UTP/STP cable with RJ-45 
  connectors to EH switch. (For the cable wiring diagrams, please 
  refer to section 7)
■ 
The corresponding RJ-45 or Fiber SC/ST LED will be lighted if the 
  Ethernet connection is linked successfully.
■ 
The LED will be blinked during data transfer by EH switch.
※UL Notice for Power supplier
All the series of EH products are intended to be supplied by a Listed 
Power Unit marked with “LPS”, “Limited Power Source” or “Class 2” 
with output rate 9-30VDC 0.6A for EH2305-1Fm, EH2305-1Fs and 
EH2306; 9-48V 0.35A(max) for EH2308. 
Or, use the recommended power supplies in “Optional Accessories”.
Tel: 886-3-5508137
Fax: 886-3-5508131
www.atop.com.tw
  EH2305-1Fs
5-Port Unmanaged Fast Ethernet Switch 
1
45.4mm
2
with Single-mode Optical Fiber
■ 
4 ports of 10/100Base-TX with RJ-45 connector 
■ 
1 port of 100Base-FX Single-mode Optical Fiber
  with SC connector
Notice : 
The EH23xx series switch is designed to be mounted on a 
well-grounded place, such as a metal panel.

LED Indicators
There are four LED indicators located at the front panel of EH series. 
Name
Fault
P1/P2
RJ-45
Fiber
SC/ST
LED
Green
Green
Green
Yellow
Data
Link
Status
Off 
On 
Off 
On 
Off
Blink
Off 
On 
Off
Blink
Off 
On
Both P1 and P2 on or off 
Either P1 or P2 on 
Power input 1/2 is not plugged yet 
Power status is ready 
Link is broken, or no cable is plugged in
The device is transferring data through the port
The link is operated at rate of 10 Mbps 
The link is operated at rate of 100 Mbps 
No data transfer
The device is transferring data through the port
No media available 
Working, the media is ready
Description
Configuration and Setting Methods
Any settings or configurations are unnecessary.
Pin Assignment of Network 
Connections
RJ-45(8-pin) to RJ-45(8-pin) straight-through cable wiring
1 8
Cable
10/100BaseT(X) Ethernet Port Connection
RJ-45
Pin 
Signal
RJ45(8-pin) to RJ45(8-pin) cross-over cable wiring 
10/100BaseT(X) Ethernet Port Connection
RJ-45
1      2      3       4      5      6       7      8
Tx+    T x -    R x + Rx-
1 8
1 8
100Base-Fx Fiber SC/ST Port Connection
SC Connectors ST Connectors
Tx
Fiber Port
100Base-Fx Fiber SC/ST Cable Wiring
ST Connector
TX 
RX
SC Connector
TX 
RX
Rx
Single-mode Multi-mode
A 
B
A 
B
←→ 
←→
←→ 
←→
Tx
Rx
B 
A
B 
A
Warning:
To protect user’s eyes from a serious damage, don’t stare into the 
Laser Beam.
Mechanical dimensions(unit=mm)
4.5
90.6
103.2
115.2
27.2
RX 
TX
RX 
TX
Warranty Policy
Warranty Conditions
Products supplied by Atop Technologies are covered in this warranty for 
sub-standard performance or defective workmanship. The warranty is 
not, however, extended to goods damaged in the following 
circumstances: 
(a) Excessive forces or impacts 
(b) War or an Act of God: wind storm, fire, flood, electric shock, 
   earthquake 
(c) Use of unqualified power supply, connectors, or maintenance 
   procedure 
(d) Replacement with unauthorized parts
RMA and Shipping Costs Reimbursement
Customers shall always obtain an authorized "RMA" number from Atop 
before shipping the goods to be repaired to Atop. When in normal use, 
a sold product shall be replaced with a new one within 3 months after 
purchase. The shipping cost from the customer to Atop will be 
reimbursed by Atop. 
After 3 months and still within the warranty period, it is up to Atop 
whether to replace the unit with a new one; normally, as long as a 
product is under warranty, all parts and labor are free of charge to the 
customers. 
After the warranty period, the customer shall cover the cost for parts 
and labor.Three months after purchase, the shipping cost from the 
customer to Atop will not be reimbursed, but the shipping cost from 
Atop to the customer will be paid by Atop.
Limited Liability
Atop shall not be held responsible for any consequential losses from 
using Atop’s product.  
Warranty Period
Product Categories
Ethernet Switches 
Wireless 
Serial Device Servers 
Modbus Gateways
90.6
Embedded Device Servers 
DIN-Rail Power Supplies 
Power Adaptors 
Antennas 
Other Accessories 
Warranty
5 Years
3 Years
1 Year
The warranty certification will not be effective until an authorized stamp 
issued by Atop’s overseas agents.
Purchase Date:       /      /        (yyyy/mm/dd)
Serial Number:
ATOP Customer Services and Supports
1. Please contact your local dealers or Atop Technical Support Center at 
  the following numbers.
+ 886-3-550-8137  (Atop Taiwan) 
+ 86-21-6495-6232 (Atop China)
2. Please report the defected problems via Atop’s Web site or E-mail 
  account
Web Site:www.atop.com.tw, e-mail:service@atop.com.tw 
Web Site:www.atop.com.cn, e-mail:service@atop.com.cn
Pin 
Signal
1      2      3       4      5      6       7      8
Rx+    R x -    T x + Tx -
32.2
45.4
78.7
90.3
─ Any change by website in material announcement primarily. ─
Housing side view(Mount kit)Backboard rear view