P
AGE
2
44443-1098 <90-00059>
ORDERING INFORMATION
GENERAL DESCRIPTION
T
he 44443-00 and 44443-01 Four-Wire Termination Sets
(Term Set) provide a compromise impedance matching
network for interfacing a 2-wire line to a 4-wire trunk or line.
The -01 option features an Idle Line Termination or Echo
Suppression override on the 4-wire transmit port.
The front panel includes dual inline (DIP) switches for setting
the 4-wire transmit and receive port attenuation and Bantam
jacks for test and calibration.
The Term Set normally functions with the Dantel 440 Communi-
cation Management System to interface 2-wire off-network lines
or PABX trunks to the 4-wire port of the 44023 PABX Line
Interface Module. The Dantel 44443 is also compatible with
units from several manufacturers and can be used in general
purpose termination set applications.
The 44443 Term Set is a plug-in printed circuit module that fits
into any 400-type, or similiar, equipment housing. The 44443-00
is a passive device which requires no supply voltage. The 44443-
01, while still a passive device, contains a relay. This relay (refer
to Fig. 1 in the
Installation
section) requires an external
voltage source.
NOTE:
This section lists the different options available for this product. To order any of the avail-
able options, contact Dantel Inside Sales through our toll-free number,
1-800-432-6835.
OPTION NUMBER
FEATURES
A11-44443-00
Term Set, Basic
A11-44443-01
Term Set, w/Echo Suppression or ILT Relay
CIRCUIT DESCRIPTION
T
he Dantel 44443 Four-Wire Termination Set functional
schematic is shown in Fig. 1.
44443-00
The basic Term Set consists of a compromise hybrid network
circuit with:
♦
A balance network and Network Build-Out (NBO) circuit.
♦
Switchable attenuator circuits for the 4-wire transmit (XMT)
port and the 4-wire receive (RCV) port.
♦
Four (4) front panel test jack circuits.
CONTINUED
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