JRC AP-IFU, Руководство пользователя

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3-13
Figure 3-1 AP-RFU Block Diagram
3.1.2 Operations and Indications
The AP-RFU does not have any operation or indication panels.
3.2 AP-IFU
3.2.1 Overview
AP-IFU consists of three blocks: IF section, digital section and interface section.
• IF section
The transmission IF section performs quadrature modulation of 427.5MHz IF frequency according to the
transmission output from the digital modem installed in the WT-ASIC.
In the receiving IF section, the received burst signal level is adjusted by the automatic gain control (AGC)
function of the digital modem. The quadrature demodulator downconverts the received IF signal into the
baseband signal.
The digital section consists of a digital modem, TDD/TDMA framer, wireless MAC processor, and system
controller. These functionarities are equipped in the WT-ASIC.
The digital modem performs modulation and demodulation of transmitting and receiving burst signals.
The interface section has an interface between the AP and the upper unit (100BASE-TX). It provides a
100BASE-FX interface by installing the AP optical INTF unit.
t o I F U
AP‑RFU
WG
BPF
RF
SW
LNA
SW
2.4GHz
Synth
26 G: × 1 0
×n
×2
DOWN̲CONV
TR SE L( R F)
PA
×2
UP̲CONV
F RE Q̲ C NT
IF部
H Y B
A S K
M O D E M
T e m p
C N T
D / A
D / A
A GC
×2
HYB
1 2 8 2 . 5
M H z
A T P C
A G C
2 1 3 . 7 5 M H z
M A X ̲ H O L D /
A V E R A G I N G
A / D
TRCNT
V ar ia bl e[ 2 0d B]
T e m p
C N T
R F U
￨
I F U
C o n t
T e m p S e n s
VAR̲ATT
[30dB]
C A B L E
L O S S
DC +1 6V
LOGAMP
TMG
Gen
COMP
TH
CNT
Ob st ac le
in fo rm at i on
T RS EL ( RF )
FR EQ ̲C NT [D AT L CL K/ LE ]
4 2 7 . 5 M H z
S A W B P F
I F ̲ F r e q
1 7 1 0 M H z
S A W B P F
Horn
Antenna(V/H)
or
Omni
Antenna(V/H)
×3
BPF
SAW
BPF
I R F
D i e l e c t r i c ̲ B P F
LOGAMP
SAW̲BPF
AG C2
RX̲LVL
CNT
AUTO ON/OFF
AG C2
RFU‑IF
AP‑RFU̲PS
Serge protection
C o a x
C A B L E