Dantel B11-44124-00 Panduan Pemasangan & Pengoperasian - Halaman 3
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Halaman Cetak
APPLICATION INFORMATION
F
. 1 - E
A
IG
XAMPLE
PPLICATION
1
46023-1X
SMART MAC
EIGHT
RS-422
SERIAL PORT
DCP
TABS
8
1
46023-1X
SMART MAC
EIGHT
RS-422
SERIAL PORT
DCP
TABS
8
CIRCUIT DESCRIPTION
44124-0798 <90-00024>
, 44124
46020-XX
MAP
DATA / TTL
MASTER
PORT
RS-232
PRINTER
SUBASSEMBLY
PORT
46020-XX
MAP
DATA / TTL
MASTER
PORT
RS-232
PRINTER
SUBASSEMBLY
PORT
A
functional schematic for the 44124 Data Channel Termina-
tion Module is shown in Fig. 2. Here is a brief description of
each of the functional parts of the circuit:
Impedance Matching Transformers
Two of the impedance matching transformers (T1 and T3)
provide a switch selectable impedance of 150, 600, or 1200 ohms
(set with switch 6). The module line conditioning circuit couples
the line side receive and trasmit signals.
The drop side transformers provide a switch selectable applica-
tion of two-wire or four-wire lines (select with switch S10). Drop
side transformer impedance is fixed at 600 ohms.
Input Equalizer Circuit
The input equalizer circuit receives an incoming signal from the
impedance matching transformer (T1). The circuit adjusts slope,
bandwidth, and amplitude before the signal reaches the input
amplifier.
Set slope equalization with switches S8-1 to S8-5
♦
♦
46033-XX
ESA
RS-232
XMT IN
PORT
600 Ω
202 MODEM
RCV OUT
SUBASSEMBLY
600 Ω
460 ALARM AND CONTROL SYSTEM
Switch S8-1 sets the equalizer slope cable to loaded or
nonloaded.
Switches S8-2 to S8-5 have assigned values that determines
the total slope figure.
44124-XX
DST
XMT OUT
600 Ω
FMAC
LOOPBACK
LINE
NMA
DETECT
SIDE
TASC
RCV IN
ETC...
600 Ω
LOOPBACK
DETECT
TO
P
3
AGE