what chipset is this?

I'm sure the OP either already has the answer for this, or has moved on...but I wanted to answer this question for anyone else that might want to know (because it took me quite a while to research all the information for myself).This device does not use either of the two main manufacturer's chipsets (it's not an FTDI nor a Prolific). Rather, it uses a TI (Texas Instruments) chipset. While those other chipset manufacturers both make some quality chips, the TI USB-->serial chipset seems to be the de-facto standard in maximum compatibility with the widest array of serial device types.

is it work for Cisco 881router? Thanks

I'm not familiar with the 881 product specifically, but it, and older Keyspan models, have worked fine for every other Cisco router or switch that I have worked with over the last 20 years. I've also used it with Adtran and other products using serial connections.

is this compatible with windows 10 out of the box or do drivers need to be downloaded from website? thanks

I am continuing to use the 8.1 drivers I downloaded from keyspan on win 10. The zip from keyspan was named Driver-for-USA-19HS-vb5-Windows-8.1.zip but they may have a newer version for win10 but I did not need it.

Are there DOS drivers for this or another usb serial device?

Sorry I have no real answer to your question. I am doubtful about DOS drivers for the Keyspan device, and the Tripp Lite/Keyspan web page does not show any drivers at all for the device. Normally Windows and MacOS have built-in compatible drivers, which in my experience work perfectly well, but I suspect there are none for DOS. I believe the cheaper devices that use the Prolific chipset may have DOS drivers. They often are shipped with a mini-CD with drivers and manuals. I have found this impossible to use since all my computers use slot-loading optical drives which cannot accept the mini-CD.

ASIN	B0000VYJRY
Best Sellers Rank	#42,000 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #4,039 in USB Cables
Brand	TRIPP LITE
Brand Name	TRIPP LITE
Compatible Devices	Camera, Laptop, PC, Printer, Tablet
Connectivity Technology	USB
Connector Type	USB Type A
Customer Reviews	4.7 out of 5 stars 2,249 Reviews
Data Transfer Rate	0.23 Megabits Per Second
External Testing Certification	REACH, CE, FCC
Frequency	230000 Hz
Global Trade Identification Number	00031112681245, 00624672945133, 00672603000413, 00672603004138, 00734089953406, 00767887431647, 00778888661421, 00858399242460, 07123290453653
Item Weight	0.33 Pounds
Model Number	USA-19HS
Net Quantity	1.0 Count
UPC	014445840060 031112353340 804993673636 858399242460 031112582559 172302821734 734089953406 069060150841 778888661421 962327325078 803982832801 031112681245 767887431647 521227996506 012304704829 638084883242 012302523378 640206602297 014444594230 163120866755 734911098718 012304764496 672603000413 731215350016 624672945133 672603004138 617407365108 642125217125
Unit Count	1.0 Count

Tripp Lite Keyspan USB-to-Serial Adapter

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