Specifications

45
󳀏Interfaces, converters
󳀏Probes
󳀏Actuators
󳀏Access control system
󳀏Fire detection system
󳀏Displays
󳀏....
Many standards of data transmissions (or fieldbus) are
available on the market. The table below gives relevant CITEL
surge protector model (DL series : Din rail pluggable module,
and DLU series : Din rail monobloc module) in relation with
the type of transmission.
●
Mechanical configuration
CITEL surge protectors for industrial data network are
designed to fit on symmetrical DIN rail.
In order to offer a large range of solutions, the surge protectors
are available in various configurations :
󳀏Number of protected wires : from 1 wire to 2 pairs.
󳀏Transmission and protection of the shield wire
󳀏Plug-in modules : Version with removable module to ease
the maintenance process.
Protecting data-processing networks
In a same way than in telecom or industrial networks,
installation of surge protectors on data-processing networks
could be necessary, specially in the following cases :
󳀏Inter-building networks
󳀏Wide networks
󳀏High Electromagnetic disturbance density
As for the other types of transmission lines, CITEL surge
protectors for Local Area Networks (LANs) are based on
association tripolar gas tubes and fast clamping diodes to
ensure efficiency on lightning surges.
However, two additional parameters are to be taken into
account: very low transmission voltage and high bitrate of the
transmission. The CITEL surge protectors for data-processing
networks are designed to fulfill these requirements.
●
Mechanical configuration
The surge protectors for data-processing networks are designed
to fit with the existing installation. In consequence, the surge
protectors are equipped with standard connectors (i.e. : RJ45)
and are available in single enclosure to protect a terminal
equipment, or in 19” rack unit format to protect at the hub level
.
Technology of surge protectors
All Citel telephone and data line surge protectors are based
on reliable multistage hybrid diagram that combines a high
discharge current capacity with fast response time.
All Citel telephone and data line surge protectors use a
combination of a 3-electrode gas discharge tube and fast
clamping diodes, in order to provide:
󳀏A nominal discharge current (repeated without destruction)
greater than 5 kA @ 8/20
㎲
impulse
󳀏An ultrafast response time < 1 ns
󳀏Safety operation in end of life (Fail-safe behaviour)
󳀏Low insertion losses to not disturb the transmission signal.
The systematic use of 3-electrode discharge tubes provides
optimum protection through simultaneous sparkover.
This set of characteristics is essential for optimum reliability of
the protected equipment whatever the incident disturbance.
Various protection diagrams are available according to
requirements and the type of network to be protected:
󳀏Standard protection, used mainly for the analog telecom
network (PSTN)
󳀏
Enhanced protection, for very low voltage transmission lines.
󳀏Line+Shield Protection : Transmission and protection for
the shield wire.
󳀏
<< K20 >> protection complying with the ITU-T K20
International recommendation
󳀏
<< Low capacitance >> protection for high bit rate links (> 1
Mbit/s)
󳀏
<<
Cat 5 >> surge protection : designed for very high bitrate
LAN (up to 100 Mbit/s).
Standards
Tests process and installation recommendations for
communication line surge protectors must comply the
following standards:
Network Wiring DLU DL
4-20 mA 1 pair DLU-24D3 DL-24D3
Profibus-FMS 1 pair+Shield DLU-12D3 DL-12D3
Profibus-PA 1 pair+Shield DLU-48D3 DL-48D3
Profibus-DP 1 pair+Shield DLU-12DBC DL-12DBC
Interbus 1 pair+Shield DLU-12D3 DL-12D3
Foundation Fieldbus-H1 1 pair+Shield DLU-12D3 DL-12D3
Foundation Fieldbus-H2 1 pair+Shield DLU-48DBC DL-48DBC
WorldFIP 1 pair+Shield DLU-48DBC DL-48DBC
Fipway 1 pair+Shield DLU-48DBC DL-48DBC
LONworks 1 pair+Shield DLU-48DBC DL-12DBC
Batibus 1 pair+Shield DLU-12D3 DL-12D3
RS485 1 pair+Shield DLU-12D3 DL-12D3
RS422 2 pairs DLU2-06D3 2 x DL-06D3
RS232 4 wires DLU2-12D3 2 x DL-12D3