User's Manual

ADCP-75-158 • Issue 1 • July 2003 • Section 1: Overview
Page 1-6
© 2003, ADC Telecommunications, Inc.
Figure 1-5. Remote NOC Interface
3 SYSTEM FUNCTIONS AND FEATURES
This section describes various system level functions and features of the Digivance System.
3.1 Fiber Optic Transport
In a typical Digivance 20 Watt system with a single HU and RU, the HU is connected to the RU
over a pair of single-mode optical fibers. One fiber is used to transport the forward path optical
signal. The other fiber is used to transport the reverse path optical signal. Because the optical
signal is digital, the input and output RF signal levels at the HU or the RU are not dependent on
the level of the optical signal or the length of the optical fiber. A diagram of the fiber optic
transport system for a typical Digivance system is shown in Figure 1-6. The Digivance 20 Watt
system does not support reverse path diversity at this time.
The maximum length of the optical fibers is dependent on the loss specifications of the optical
fiber and the losses imposed by the various connectors and splices. The system provides an
optical budget of 25 dB (typical) when used with 9/125 single-mode fiber.
DESKTOP COMPUTER WITH EMS
(LOCAL AND REMOTE INTERFACE)
HOST UNIT
HOST UNIT
HOST UNIT
NETWORK
OPERATIONS
CENTER
(REMOTE
INTERFACE)
T1 OR
OTHER
MEDIUM
CONTROLLER
AREA
NETWORK
CONTROLLER
AREA
NETWORK
RS-232 ASCII
RS-232
18525-A
CD-ROM WITH DIGVANCE
ELEMENT MANAGEMENT
SYSTEM (EMS) SOFTWARE
REMOTE
UNIT
REMOTE
UNIT
REMOTE
UNIT