9
T1/E1 FIBEROPTIC LINE DRIVER
The electrical interface meets requirements of AT&T PUB 62411 and CCITT
G.703 for a T1 interface, and CCITT G.823 for an E1 interface. The Line Driver
operates from either 100 VAC, 115 VAC, 230 VAC, or - 48 VDC. The unit comes
in a compact standalone case that can be placed on a desktop or shelf, or can be
mounted in a 19-inch rack (with adapters).
2.2 System Considerations
The Line Driver provides a simple and reliable means for transmitting full-duplex
T1 or E1 signals via a fiberoptic medium.
Figure 2-1. Typical Line Driver Application.
2.2.1 D
ATA
T
RANSFER
In the application illustrated in
Figure 2-1
, each Line Driver receives T1 or E1
signals which are equalized to overcome electrical link distortion. The Line Driver
then converts the T1 or E1 signals into an optical signal. The optical signal is
coupled to the fiberoptic media and transmitted via the optical link to the remote
unit. The optical output power is user-selectable by a two-position switch marked
Range. Its setting depends on the fiberoptic link. A high-sensitivity pre-amplifier
and an AGC (Automatic Gain Control) circuit enable the remote unit to receive
the optical signal. The output of the receiver is applied to the clock-recovery and
data-regeneration circuit which then applies it to the electrical interface driving
circuit.
2.2.2 I
NTERFACING
The electrical interface is selectable by means of a three-position internal
INTERFACE switch.
T1/E1
Fiberoptic
Line Driver
T1/E1
Fiberoptic
Line Driver
Twisted
Pair or
Coax
Twisted
Pair or
Coax
T1 or E1
Mux
T1 or E1
Fiberoptic
Cable
T1 or E1
T1 or E1
Mux
