RJ11 Fax/Modem (FXO)
Modem
DAA
RJ11
B1250T
TISP4350T3BJR-S
Solid-State
Hook Switch
CD2320-B1600
e schematic above illustrates the application protection and does not constitute the complete
circuit design. Customers should verify actual device performance in their specic applications.
TISP4350T3BJR-S
CD2320-B1600
B1250T
COPYRIGHT© 2012 • BOURNS, INC. • 6/12 • e/CPK1021 • “PortNote” is a registered service mark of Bourns, Inc.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
Solution Products
Asia-Pacific: Tel +886-2 256 241 17
Fax +886-2 256 241 16
Bourns® PortNote® solutions provide protection
recommendations for typical port threats.
For more information, go to:
www.bourns.com
or email: protection@bourns.com
Americas: Tel +1-951 781-5500
Fax +1-951 781-5700
Europe: Tel +41-(0)41 768 55 55
Fax +41-(0)41 768 55 10
Compliance
ITU-T K.21, IEC 60950, UL 60950 and TIA-968A
Alternate Recommendations
e TISP4310T3 should be considered for some “B”
type ringers or for ITU-T Enhanced testing; consult
with your local Bourns representative.
Benefit
is solution provides a high level of protection
within a small amount of PCB area.
Objective
In telecommunications, foreign exchange
oce (FXO) designates a telephone
signaling interface that receives plain old
telephone service (POTS). is solution
protects those interfaces against surge and
power contact threats.
Solution
1 yristor: TISP4350T3BJR-S
1 Telecom Fuse: B1250T
1 Diode Bridge: CD2320-B1600
PN-DESIGNKIT 8
Design Kit
