11
CHAPTER 2: Introduction
2.1.3 F
EATURES
• Extend the range of T3 signals over fiberoptic cable up to 68.35 miles
(110 km).
• Transparent to T3 signals.
• Conform with all relevant ITU series standards.
• Supports single-mode or multimode fiber.
• LED status indicators.
• V.54 loopbacks activated from the front panel.
• An alarm relay port for reporting the status of the system.
• Immunity to electrical interference such as EMI, RFI, spikes, and differential
ground loops.
• Secure data transfer (no tapping on the transmitted information).
• Protection from sparks and lightning.
• Secure link in hazardous or hostile environment.
Table 2-1. Fiberoptic interface options.
Wave- Fiber Type
Transmitter
Typical
Receiver Maximum
length
Type
Power
Sensi-
Range
tivity
[nm]
[µm]
[dBm]
[km/miles]
850
62.5/125 multimode
LED
-18
-28
2.5/1.5
1310
9/125 single-mode
LED
-15
-31
27/16.8
2.1.4 A
LARMS
When the T3 Fiber Optic Line Driver detects that electrical interface levels are
below G.703 electrical levels, it transmits an “All 1s” signal (AIS) to the optical
interface.
When an AIS is detected at the optical or electrical interface, the line driver
transparently converts the signal and alerts the user via the front-panel LEDs and
the alarm relay port.
