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E1 Interfaces
The E1 interfaces conform to the ITU G.703 and G.704 electrical and signaling interface
recommendations. Two interfacing configurations are allowed - two pair of BNC coaxial connectors or
two 15-pin sub-D connectors and RJ48 connectors.
The coaxial connection provides a 75Ω unbalanced connection. The shield of the TX coaxial connection
is attached to earth ground. A strap is provided to optionally connect the shield of the RX coaxial
connection to ground as described in G.703. The 15 pin sub-D and RJ48 connection provides a 120Ω
balanced connection.
TRACER System Configuration
A TRACER system is composed of three major subsystems -- a baseband processor, a radio frequency
converter, and an antenna. The following section describes the system components.
Baseband Processor or BBP
The baseband processor or BBP is a 1-U, 515 mm (19-inch) rackmountable unit. This unit provides the
system electrical interfaces, user controls and indicators, and performs the spread spectrum processing
for the system. The rear panel provides all of the electrical interface points -- E1 interfaces, VT100
compatible terminal, alarm contacts, IF signal, and DC power (from facility or optional AC adapter).
The BBP front and rear panels are illustrated in Figures 1-3 and 1-4.
RS232
TRACER 2 X E1 User's Manual
Figure 1-3. BBP
E1B
G.703
E1A
75 OHM
75 OHM
TX
RX
TX
RX
Figure 1-4. BBP Rear Panel (75
Section 1 TRACER Description
ALM
ALM
TEST
LBK
LBK
CV/CRC
CV/CRC
POWER
LOS/OOF
LOS/OOF
IF
MAJ
MIN
NO COM
NC
NO COM NC
Ω
Option)
61280004L2-1C
TRACER
PLAN A
RF LOW
PLAN B
LINK DOWN
DC POWER
3
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