A feature comparison of all of our 56K modems.
Product name 56K* V.92 Internal PCI Modem plus Fax 56K* USB Controller Modem plus Fax/Voice 56K* USB Softmodem plus Fax 56K* V.92 External Modem plus Fax Courier® Lite 56K* Business Modem REFURBISHED Courier® 56K* V.92 Business Modem 56K* V.92 PCI Express Faxmodem 56K* OEM PCI Voice Software Faxmodem
Model 5670 5637

Discontinued, replaced by USR5639		 5639 5686G 5686G-PRO

Discontinued, replaced by USR5686G		 3453C-REF

USR3453C now discontinued, USR3453C-REF is current replacement for US customers		 5638 3093-OEM

Discontinued
Form factor / interface PCI USB USB RS-232 RS-232 RS-232 PCIe 1.1 PCI
low profile available
Internal / external INT EXT EXT EXT EXT EXT INT INT
Pack quantities (in units) single single single single single single single 20
Windows Operating System

"NOTE:" both 64 and 32 bit systems supported unless otherwise noted		 Win 11
2019
2016
Win 10
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95		 2019
2016
Win 10‡
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95		 Win 11
2019
2016
Win 10
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95		 Win 11
2019
2016
Win 10
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95		 2019
2016
Win 10
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP2
KMe
NT
98
95		 2019
2016
Win 10
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95		 Win 11
2019
2016
Win 10
2012 R2
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95		 2016
2012
Win 8
2011
Win 7
2008
Vista
2003
XP
2K
Me
NT
98
95
Linux Operating System

"NOTE:" both 64 and 32 bit systems supported unless otherwise noted		   Kernel 2.3
or higher		   Kernel 2.3
or higher		 Kernel 2.3
or higher		 Kernel 2.3
or higher		    
Macintosh Operating System   Mac OS X 10.4-10.11, 10.12‡            
Plug & play
Global approvals US, CA US, CA, EU, Global† US, CA, EU, Global† US, CA, EU US, CA, EU, Global† USR3453C-REF US; USR3453C US, CA, EU, Global† US, CA, EU, Global† US, CA, EU, Global†
Fax capability ‡
Voice   ‡          
Controller-based        
Hayes compatible
Unimodem TSP/TAPI compliant
Exclusive line probing          
Remote manageability            
Carrier loss redial            
Adaptive speed leveling              
Flash ROM upgradeable        
V.22 Fast Connect          
V.Everything® Technology            
V.Everywhere® Technology              
V.92 Technology Ready Ready Ready Ready Ready Ready Ready Ready
Wake on ring              
Online call notification§      
Caller ID Type 1    
Caller ID Type 1
Modem on Hold**            
Value Add Software CD-ROM      

INT=Internal Modem, EXT=External Modem, XP=Windows XP, Me=Windows Me, NT=Windows NT 4.0, 2K=Windows 2000, 98=Windows 98, 95=Windows 95, 3.1=Windows 3.1, D=DOS, R=Ready, d=beta DOS drivers are available on our site, but we do not provide support for their use.

US=United States, CA=Canada, EU=European Union including Turkey, Norway, Switzerland, Liechtenstein and Iceland

† Global approvals are available for additional countries in Central America, South America, Asia and the Pacific Rim for certain models. Approvals vary by product and are listed individually. Country approvals may change at any time without notice.

‡ Limited product features: Voice functionality is no longer available in Windows 10. Fax features no longer supported in macOS Sierra Version 10.12.

*Capable of receiving downloads at up to 56 Kbps and sending at up to 31.2 Kbps. Actual download speeds you experience may be lower due to varying line conditions. Maximum download speeds in the U.S. and Canada are limited to 53K, due to regulatory limits on power output. Requires compatible analog phone line and server equipment.

§ In order to use Internet Call Notification (ICN) software, Caller ID and Call waiting services are required from your phone company.

** Modem on Hold requires all of the following: the telco supports type II Caller ID, the ISP supports V.92 with MOH enabled, and a compatible operating system.