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CHAPTER 2: Introduction
2.1.3 V
ERSIONS
Four standalone versions of the Fiber Optic Modem are available.
• Sync/Async Fiber Optic Modem, ST connectors, 1300-nm single-mode fiber,
RS-530, 115-VAC power supply (part number ME555A).
• Sync/Async Fiber Optic Modem, ST connectors, 1300-nm single-mode fiber,
RS-530, 230-VAC power supply (part number ME555AE).
• Sync/Async Fiber Optic Modem, ST connectors, 850-nm multimode fiber,
RS-530, 115-VAC power supply (part number ME556A).
• Sync/Async Fiber Optic Modem, ST connectors, 850-nm multimode fiber,
RS-530, 230-VAC power supply (part number ME556AE).
The standalone unit is supplied in a compact case that can be mounted on a
desktop or shelf, or in a 19" rack.
The Fiber Optic Modem comes with a Light Emitting Diode (LED) light source.
2.1.4 F
EATURES
•
Fiber Optics:
Fiber optic technology permits high immunity against electrical
interference such as electromagnetic interference (EMI), radio-frequency
interference (RFI), spikes, and differential ground loops. It also provides
protection from sparking and lightning and gives you a secure link in
hazardous or hostile environments. It protects point-to-point data links at
ranges longer than a conventional copper wire modem over noisy
environments. It also provides high data security, minimizing the risk of
eavesdropping.
•
Interface:
The Fiber Optic Modem has an RS-530 interface.
•
Timing:
The Fiber Optic Modem receives clock timing from three variable
sources: Internal, External, or Receive clock. The Modem uses a phase locked
loop (PLL) circuit to recover jitter-free data and clock sync from the optical
signal.
•
Test and Diagnostic Capabilities:
The Fiber Optic Modem features V.54
diagnostic capabilities for performing local analog and local and remote
digital loopbacks.
