Connecting a passive TAP

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Introduction

Passive Fiber Optic TAPs require little or no configuration. While cabling the network - and site ports is straight forward, the cabling between the TAP output and the NETSCOUT Accelerator NIC is somewhat special.

 

Solution

 

 

 

LC SM/MM HD Fiber TAP

TAP internal wiring:

 

TAPInternalCabling.png
TAPInternalCabling.png

 

Y-cable

The two fibers of the duplex LC-LC output of the TAP - indicated with "monitor" - are both used for transmission.

To connect to the NETSCOUT Accelerator NIC, you need a LC-LC-duplex to 2x LC-simplex fan-out cable. It is very simple to make a cable like this from a standard (zip) fiber optic patch cord:

 

LCLCFanOut.jpg
LCLCFanOut.jpg

 

Connecting the TAP to the NETSCOUT Accelerator NIC

Both LC-simplex connectors of the Y-cable must be connected to the input (RX) of two SFP/SFP+ ports on the NETSCOUT Accelerator NIC on the back of the appliance.  The ports are numberd from top to bottom.  In some servers (like the PMA-2XX), the card is 90° rotated clockwise.  It is recommeded to use the lowest port numbers first.

The following picture is showing the TAP - situated on top of the server - while its output is connected via a Y-cable to the first and second interface (SFP) on the server.

 

TAPConnectNIC.jpg
TAPConnectNIC.jpg

 

Port aggregation

An aggregate must be created from the two ports the tap is connected to.  Ask our COMCERT Engineer to configure a Port Aggregate for you or read the Agent Configuration Utility for CDM/ASI Administration Guide for details on how to do this.