Agilent Technologies J3972A - Manual (Page 80)

Installation
Connecting the Probe
60
Depending on what type of testing you want to do with the probe’s OC-3 ATM
Interface, you may need some of the following equipment:
z You may need to put an Attenuator on the output of the probe’s OC-3 ATM
Interface or the output of the laser source when you are connecting to a
network. You can order a set of 2 10dB attenuators (Agilent J2928A).
z Optical Splitters are used when you want to passively monitor network
traffic. You can order a multi-mode SC-to-SC Optical Power Splitter
(Agilent J2929A).
Bypass Mode
The probe has a 6-pin mini-DIN connector that allows the probe to be connected
to an external optical bypass. The optical bypass is optional and only functional
when using the fiber SC connectors. The probe’s optical bypass is used to
maintain the network link even if the probe experiences a power interruption.
Optical Bypass Switches (optional equipment) are required to create a fault
tolerant application with fiber networks.
For the Fiber connections, the Bypass Mode is accomplished by using the probe’s
optical bypass connector. This 6-pin mini-DIN connector is located on the back of
the probe, refer to Figure 3-3 on page 51. The optical bypass connector provides
power to an external, optical-bypass switch that bypasses the probe when it
experiences a power interruption. The result is no interruption to the network. The
external, optical-bypass switch must be ordered separately. Refer to the
instructions that come with the optical-bypass switch to connect it to the probe.
Connecting to the Serial Port (Out-of-Band)
Out-of-Band communications with the probe are conducted through the serial
port, not over the network. This mode of communications is optional.