Difference between revisions of "Compex WP188"

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The MPW188B is the newest and may eventually be the only WAR board from Valemount for AP purposes.
__TOC__
It has four mPCI slots and two Ethernet ports.  It can handle two "high power" and two "standard"
== Description ==
or "medium power" radios.  What exactly qualifies as "high power" and "medium power" seems always
The WP188-A and WP188-B are the newest 2-radio and 4-radio boards from Valemount. They are currently sold as standalone boards and also used in the certified Lucaya X2000 and X4000 series, but, as of Sept. 2010, they have been declared end-of-life and supplies will be running out.
to be left unstated, as if everyone in the world except for you was born knowing what those terms mean.
If anyone knows the specific meaning of those terms, they can do us all a favor and fill it in here.


From the images on the Web, it appears that the MPW188B has two of the mPCI slots on each side.
== WP188 Series Common ==
The dimensions are described, so far, as "Not sure", although probably the actual dimensions are subject to measurement with a ruler.  Perhaps someone with access to both a ruler and an MPW188B can edit this text with the actual dimensions of the board.
The WP188 boards have two of the mPCI slots on each side. The boards measure approximately 5" x 8" x 1".


== WP188-A Quad mPCI ==
The four-card version of the WP188-A has four miniPCI slots and one (late models) or two (early models) Ethernet ports.
It can handle up to two "high power" (XR2/XR5/XR9/KXS30SG) and two "standard" or "medium power" (WLM54 series, CM9, etc.) radios.
High power cards are supposed to be on top in the X4000 for reasons of cooling.


{{Stub}}
=== Pictures of WP188-A Quad mPCI Board Layout ===
{{Reformat}}
[[Image:WP188-A_front.JPG|right]]
[[Image:WP188-A_back.JPG|right]]
 
== Repairing damaged boards ==
 
After a voltage surge, the WP188 may develop a short that connects
the 48v power rail to ground.  This can be detected and repaired.
The diodes on the underside of the board near the Ethernet port
marked as D1, D2, and D3 are Transient Voltage Suppressors
which may protect the board from moderate surges but can be permanently
shorted by excess voltage.
 
The symptoms can be detected as follows.  First, the unit will draw
too much current, triggering whatever overcurrent protection there is.
Second, the mounting hole nearest to D1, D2, and D3, if isolated
from ground, will show a voltage reading of +48.  It is the connection
of this spot to ground that produces the short circuit on the power.
Third, at least one of the diodes D1, D2, and D3 will show a short
in both directions when tested for conductivity.
 
The simplest repair is to desolder and remove the shorted diodes.
Unless there is other damage, the board can then function normally,
albeit with diminished surge protection.  A full repair consists of
replacing the blown diodes.  There are numerous transient voltage
suppressors on the market.  Littlefuse 576-SMAJ54CA (Mouser part
number 576-576-SMAJ54CA) is one that has been seen to work in practice.
It seems that since it is a bidirectional version, you do not have to
worry about orienting it correctly.

Latest revision as of 15:36, 19 September 2010

Description

The WP188-A and WP188-B are the newest 2-radio and 4-radio boards from Valemount. They are currently sold as standalone boards and also used in the certified Lucaya X2000 and X4000 series, but, as of Sept. 2010, they have been declared end-of-life and supplies will be running out.

WP188 Series Common

The WP188 boards have two of the mPCI slots on each side. The boards measure approximately 5" x 8" x 1".

WP188-A Quad mPCI

The four-card version of the WP188-A has four miniPCI slots and one (late models) or two (early models) Ethernet ports. It can handle up to two "high power" (XR2/XR5/XR9/KXS30SG) and two "standard" or "medium power" (WLM54 series, CM9, etc.) radios. High power cards are supposed to be on top in the X4000 for reasons of cooling.

Pictures of WP188-A Quad mPCI Board Layout

WP188-A front.JPG
WP188-A back.JPG

Repairing damaged boards

After a voltage surge, the WP188 may develop a short that connects the 48v power rail to ground. This can be detected and repaired. The diodes on the underside of the board near the Ethernet port marked as D1, D2, and D3 are Transient Voltage Suppressors which may protect the board from moderate surges but can be permanently shorted by excess voltage.

The symptoms can be detected as follows. First, the unit will draw too much current, triggering whatever overcurrent protection there is. Second, the mounting hole nearest to D1, D2, and D3, if isolated from ground, will show a voltage reading of +48. It is the connection of this spot to ground that produces the short circuit on the power. Third, at least one of the diodes D1, D2, and D3 will show a short in both directions when tested for conductivity.

The simplest repair is to desolder and remove the shorted diodes. Unless there is other damage, the board can then function normally, albeit with diminished surge protection. A full repair consists of replacing the blown diodes. There are numerous transient voltage suppressors on the market. Littlefuse 576-SMAJ54CA (Mouser part number 576-576-SMAJ54CA) is one that has been seen to work in practice. It seems that since it is a bidirectional version, you do not have to worry about orienting it correctly.

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