Network Device Quick Start Guide
EIR203 1308qsg-1/2 
© 2008 by B&B Electronics. All rights reserved. 
International Headquarters: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 
815-433-5100 Fax 433-5104 www.bb-elec.com orders@bb-elec.com support@bb-elec.com 
European Headquarters: Westlink Commercial Park Oranmore Co. Galway Ireland
 +353 91 792444 Fax +353 91 792445 
www.bb-europe.com orders@bb-europe.com support@bb-europe.com
B&B ELECTRONICS   QUICK START GUIDE
Package Contents 
•  EIR203 Series Industrial, Unmanaged, Ethernet Switch 
•  Quick Start Guide (One per shipment) 
•  Power Terminal Block (installed) 
•  Fiber Optic Dust Covers (installed on fiber optic models) 
If any item is missing or damaged, contact B&B Electronics 
for a replacement 
Front Panel 
EIR203 (3 Fiber) 
EIR203 (1 Fiber, 2 RJ-45)
1  Power Terminal Block  2 Position, Removable 
2  PWR LED  ON When Power Applied 
3  Fiber Optic SPD LED  Normally OFF (100BaseFx) 
3  Fiber Optic LINK LED  ON When Fiber Port Linked 
4  Fiber Ports  Number and type depends on Model 
5  RJ45 Ports  Number depends on model 
6  RJ45 LINK LED  On when RJ45 Port Linked 
    Flashes When Data Transmitted 
6  RJ45 SPD LED  On if 100 mbps 
DIN Rail Mounting 
1.  Slide and hold the DIN clip toward the bottom of the 
switch. Angle the top portion of the DIN mount over the 
top of DIN Rail. 
2.  Move the switch so that it is parallel with the DIN Rail. 
3.  Let go of the DIN Clip. The spring should return it to its 
original position. 
Attach Power Leads 
External Supply Required 
Warning: Work Safe – Equipment 
damage or electrical shock hazard 
exists. DO NOT ATTACH OR REMOVE 
LEADS WITH THE POWER SUPPLY 
ENERGIZED! 
1.  Loosen the screw to open the terminal block lead clamp. 
2.  Insert the power lead. TB will accept 12-28 AWG wire. 
3.  Tighten the screw to close the terminal block lead clamp. 
Ensure the clamp holds the lead securely. However, do not 
over tighten. 
NOTE: For replacement Terminal Block order Part # 7444. 
EIR203 Series Quick Start 
Guide 
Attach RJ45 Cable 
(
If e
q
ui
pp
ed
)
MDI Cable Pinout 
Pin Signal 
1 Tx+ 
2 Tx- 
3 Rx+ 
6 Rx- 
MDI-X Cable Pinout 
Pin Signal 
1 Rx+ 
2 Rx- 
3 Tx+ 
6 Tx- 
Female RJ45 
1. Auto MDI/MDI-x is 
supported. A straight 
through or cross-over 
cable may be used. 
2. 10/100BaseT auto 
negotiation and full/half-
duplex are supported. 


