Grass Valley 3430AP CopperHead - Manual (Page 58)

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Operation
Operation of the CopperHead 3430AP Transceiver System
Using the Digital Displays
A Brief Guide to Measurement of Fiber Optic Signal Strength
The CopperHead 3430AP Transceiver System operates within a defined fiber optic link
margin, based on two factors:
a Output (or “launch”) power of the optical transmitter at each end of the link: typically
‐7dBm*
b Sensitivity of the optical detector at each end of the link: typically ‐22 dBm.
Fig. 4-6: Optical Link Power Disbursement
The overall link margin (or dynamic range) of the CopperHead 3430AP system (the difference
between the transmitter’s output power and the receiver’s sensitivity) is typically 15dB .
That margin is consumed by two main factors:
a Optical loss over the length of the fiber cable, typically 0.5dB per kilometer
b Optical loss at connection points, typically 1 dB per connector
The CopperHead 3430AP Transceiver System provides direct digital readout of the fiber optic
link signal strength for both the base‐to‐camera link and the camera‐to‐base link.
The digital readouts on both the CopperHead 3400 base station and the CopperHead 3430AP
camera unit provide direct signal strength measurements in dBm. These readouts also provide
a wide range of diagnostic information. The use of the digital readouts is described below.
*The unit “dBm” is an abbreviation for the optical power measured in decibels referenced to one
milliwatt (mW).