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

The label on the tap indicated where the light should arrive (Rx) and where it will be transmitted (Tx).  Attention: when Rx/Tx are reversed on ports A andB, the link will still come up but the bleed-off won't work.

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.  Some appliances (like the PMA-2XX) have the card rotated 90° clockwise.  It is recommeded to start with the lowest port numbers.

The following picture is showing the TAP - situated on top of the appliance - while the output is connected with a Y-cable to the first and second interface (SFP+) of the NETSCOUT Accelerator NIC.  The TAP is not yet brought in line.

 

TAPConnectNIC.jpg
TAPConnectNIC.jpg

 

Port aggregation

An aggregate must be created from the two connected ports.  Ask your COMCERT Engineer to configure a Port Aggregate  read the Agent Configuration Utility for CDM/ASI Administration Guide carefully for details on how to create a Port Aggregate.