Table of Contents
Advertisement
61280242T1R1A-1A
Section 1 TRACER 4103/4203 Description
For the T1 receiver to operate correctly, a minimum number of "1s" must exist on the T1 facility. If the
data cannot be guaranteed to meet this requirement, then another line coding format is used. In the
bipolar 8 zero substitution (B8ZS) scheme, a string of eight "0s" is replaced by a special sequence of
eight bits that contains a bipolar violation. The receiver, upon recognizing this sequence, reinserts the
eight "0s" and the data is recovered intact.
DS1/DSX-1 Interface
When connecting the interface to the public switched network, an ADTRAN-provided cross-over cable
(part number 3125M011) is required to meet FCC part 68 and IC CS03 requirements. This cable is
required to cross-over the Tx and Rx pairs to meet the connecting arrangement of a network interface
device. This cable is included with the unit and is labelled "T1 Crossover."
Line Buildout or LBO
The DS1/DSX-1 interface provides two different types of line buildouts (LBOs), respectively. When
set for DS1, LBOs for 0 dB, -7.5 dB, -15 dB, and -22 dB are available. The DS1 interface can operate
on line lengths up to 6,000 feet. When set for DSX-1 interface, LBOs for 0-133 feet, 266-399 feet, 399-
533 feet, and 533-655 feet are available.
TRACER 4103/4203 SYSTEM CONFIGURATION
The following section describes the TRACER 4103/4203 system components.
TRACER 4103/4203 Rear Panel
The rear panel provides all of the electrical interface points – DS1/DSX-1 interface, DS1/DSX-1
monitor, VT 100 terminal, alarm contacts, RF signal to the antenna, and DC power. The TRACER
4103/4203 rear panel is illustrated in Figure 1-3.
OUT
IN OUT
Figure 1-3. TRACER 4103/4203 Rear Panel
DS1/DSX-1 Interface
Two DS1/DSX-1 interfaces, labelled "T1A" and "T1B," are provided for connecting to the T1
equipment. Two types of physical interfaces are provided – RJ-48C and bantam jacks. The
DS1/DSX-1 interfaces provided for each channel are the same. The upper bantam connectors, labeled
"Monitor," provide isolated monitor points for testing. The lower bantam jacks provide signal insertion
points. The insertion of a bantam jack disconnects the RJ-48C connector from the circuit. The DS1/
DSX-1 interface can operate on line lengths up to 6000 feet.
16
TRACER 4103/4203 User Manual
Advertisement
Table of Contents
