Huahuan Electronics H20RN-2000.V2 Series User Manual

2 Architecture and Introduction
Hardware Description
H20RN-2000.V2 Series Platforms
8
Beijing Huahuan Electronics Co., Ltd.
Version 1.3(Oct.2019)
Dual-E1
socket pin
E1 connection
Twisted-pair
Recommended
twisted-pair color
3
E1_OUT (1) +
Paired
Orange
4
E1_OUT (1) -
Orange-white
5
E1_IN (2) -
Paired
Green
6
E1_IN (2) +
Green-white
7
E1_OUT (2) +
Paired
Brown
8
E1_OUT (2) -
Brown-white
Figure 2-6 Dual-E1 connector diagram
1
8
When 120Ω impedance is used, E1 port can directly use dual-E1 connector crimped with 120Ω
twisted pair. When a cable is being made, please ensure the input and output line pairs
respectively use a twisted pair, or interference would be introduced. When 75Ω impedance is
used, E1 port requires the help of accessory cable ZJN. BH4.850.123 or ZJN. BH4.850.107 to
realize the conversion from dual-E1 connector to BNC socket. Output BNC shell is grounded,
but input shell is not grounded.
4 groups of K1~K4 DIP switches in the circuit board are used to set E1 port impedance, as
shown in Table 2-6.
Table 2-6 E1 port DIP definitions
DIP
Definition
Remark
K1_1/K1_2
ON/ON: selects 75Ω in the 1
st
E1 channel
OFF/OFF: selects 120 Ω in the 1
st
E1
channel
8-position DIP
switches of K1
control 1~4 E1

Huahuan Electronics H20RN-2000.V2 Series Specifications

General

Brand	Huahuan Electronics
Model	H20RN-2000.V2 Series
Category	Multiplexer
Language	English