Jan 232011
 

High power requirements of Realtek RTL8187L chipset, found in the ALFA AWUS036H USB wireless adapter, can cause ”on and off cycling” and/or dropping of connections and performance issues (see details below).  We have two solutions:

1. POWERED 4-port USB 2.0 hub with an AC adapter

2. USB cable with two A-male connectors: This resolves some power issues for Alfa AWUS036H

3. USB Cable Extender over CAT5/6 cable (up to 60-meters) with power supply (sold separately)

DETAIL:  The Realtek RTL8187L chipset, found in the ALFA AWUS036H USB wireless adapter, is quite power hungry.  That is, it draws much more than 500ma when operating.  USB controllers are rated for 500ma per port and most will shut down the port when the load exceeds ~550ma.  This causes a constant “on and off” cycling of the device in some cases.  The fix is simple… Purchase a POWERED 4-port USB 2.0 hub… one with an AC adapter to provide external power.  The AC adapter is rated to provide 2000ma of power to drive 4 ports @ 500ma each, but will supply a single port with up to 2000ma…. more than enough power to satisfy the Realtek chipset.  This has resolved the problems of performance and signal dropping for our customers.

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