User's Manual

61280.003L1-1B PAGE 7
4/12/99
The interfaces are illustrated in the BBP Block Diagram below.
The functions of the BBP are partitioned into three printed circuit
boards or PCBs, all contained in the same enclosure.
Σ
T1
T1
T1C
Multiplex
Viterbi
Encoder/
Decoder
Spread
Spectrum
Data
Pump
90
90
Baseband Processor Board
IF Interface Board
Fc = 70 MHz
Fc = 140 MHz
Filter
µCUART DSP
-48Vdc
RS-232
T1A
T1B
IF
Figure 1-5. BBP Block Diagram
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.
When connecting either T1 interface to the public switched
network, an ADTRAN-provided cross-over cable (part number
3125.M011@A) is required to meet FCC part 68 and IC CS03
requirements. This cable is included with the BBP and is labelled
“T1 Crossover.” This cable is required to cross-over the TX and
RX pairs to meet the connecting arrangement of a network interface
device.
TRACER DESCRIPTION