Will the software work with MAC OS X El Capitan and the SIP implmentation? Can a USB hub be connected to this unit and how many devices may be supported?

Can't answer on OS X El Capitan or SIP, but you can definitely attach a USB hub. Per the product brief PDF on Silex America's website: "2 USB port – with a total of 1000mA of power supply; using an optional USB hub, up to 15 USB connections can be supported" I have one that has two 7-port single-chip (most are a 4-port hub with another 4-port hub cascaded) self-powered USB hubs on it and it works fine, though I don't think I've ever filled all 14 ports (if the hubs count, one port would have to stay empty). The SX2000 and earlier models had issues with cascaded hubs, but I do not believe this is the case anymore. I just have the same hubs I have from back then (translucent case made it easy to find one that wasn't a two-chip hub).

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Silex SX-DS-4000U2 High Performance Gigabit USB Device Server

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The SX-DS-4000U2 is a high-performance USB Device Server with an astounding 800 MHz of computing power. The USB Virtual Link technology from silex technology allows virtually any kind of USB device network-capable in the simplest of manners. Printers, scanners, hard drives, dongles and card readers can be used over the network via 2 USB Hi-Speed ports with the SX-DS-4000U2 just as though they were connected to the computer.

Model
Brand	Silex
Model	SX-DS-4000U2

Details
Type	Device Server
Specifications	Wired LAN: 10BASE-T, 100BASE-TX, 1000BASE-T (automatic detection) Device Interface: 2 x USB 2.0 Hi-Speed ??(A type) with a total of 1A power supply Supported protocols: TCP / IP OS support: Windows 7 (32/64 bit), Vista (32/64 bit), XP, 2000, Windows Server 2008 (32/64 bit), Windows Server 2003 (32/64 bit) Mac OS X - PowerPC: Ver 10.3.x ~ Ver 10.5.5, Intel: Ver 10.4.4 ~ Ver 10.7.x Setting method: Configuration utility, Web browser, WPS Maximum power consumption: 2.5W (DC5V .5A) up to 7.5W (DC5V 1.5A) including 1A for USB power Other: Requires SX Virtual Link version 3.8.0 or later for Windows or version 3.7.0 for Macintosh External dimensions: 99 x 67 x 30 mm (without rubber feet) Weight: 97 g

Features
Features	High-Performance: Higher data throughput due to optimized performance and Gigabit connection: Extremely powerful CPU (800MHz) and two USB Hi-Speed ports (TypeA) Energy Saver Mode: When the device server is not used for a certain period of time, the power supply to the USB bus is turned off to save energy. The power supply to the USB bus is automatically turned back on when the server is used again. Print Server Function: Supports standard TCP/IP printing (LPR/IPP/RAW) The product supports the general RAW-mode, LPR-mode and IPP-mode network printing protocols. When the product is connected to a printer, the standard Windows print function can be used to print. AutoConnect Feature: The Printer AutoConnect feature allows multiple computers to easily share USB printer over the network by making an automatic connection to the printer. Then automatically disconnecting after the print job is sent making the device server available to the next user. Isochronous Transfer Mode: USB devices such as Webcams or USB sound cards, which require ongoing data transmission in real time, can also be used in the network environment. Both Full Speed and Hi-Speed USB are supported. With the SX-DS-3000WAN, you can connect a variety of USB devices over the network, like USB dongles, MP3 players, CD/DVD/Zip drives, USB drives and other storage media, scanners, printers, digital cameras, USB sound cards, USB LCD monitor, telescopes, mixing consoles and many more. Virtual environments: The USB Device Server is compatible with the following virtualization programs and environments: VMware, Citrix, Microsoft Terminal Server and Hyper-V. No special drivers or applications are needed to use the USB devices: The drivers and applications that worked when the USB device is directly connected to the computer will continue to work.

Additional Information
First Listed on Newegg	October 16, 2012

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Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return for refund within: 30 days
Return for replacement within: 30 days
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Manufacturer Contact Info

Manufacturer Product Page
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Support Phone: 1-866-765-8761
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Silex SX-DS-4000U2 High Performance Gigabit USB Device Server

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Customer Reviews of the Silex Technology America, Inc. SX-DS-4000U2

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Warranty, Returns, And Additional Information

Warranty

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Manufacturer Contact Info

Item#: N82E16833996156

Silex SX-DS-4000U2 High Performance Gigabit USB Device Server

Learn more about the Silex Technology America, Inc. SX-DS-4000U2

Customer Reviews of the Silex Technology America, Inc. SX-DS-4000U2

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info