AN12012 Datasheet, PDF (3/12 Pages) Bel Fuse Inc. – Network Connector Interfaces and Differential to Common Mode Conversion

The first interface is a connector; most often an RJ45 or ARJ45 (augmented
RJ45. It is usually a receptacle (a jack) at the network appliance side, and a plug
at the Premise Wiring cable side.
The first interface is the interruption and disturbance of the twisted pair media.
The second interface is a transformer that provides a safety barrier between
cables and a networking appliance. Often transformers, other magnetic elements
and other signal conditioning components are incorporated into the connectors:
such connectors are referred to as Integrated Connector Modules (ICM).
As a result, the connectors specified by TIA-568 series and ISO/IEC standards
for the premise wiring have the same name as network equipment connectors
but look and function differently. What they have in common are the interfaces.
The interface is subject to mechanical stresses and abuses. It is subject to
electrical discharges due to connect and disconnect under the electrical load, in
particular, in the Power-over-Ethernet (POE) applications.
And yet the interfaces have to be inexpensive and therefore not complex, must
be robust and be easy to use by millions of people.
FIGURE 1 shows the most common connector interfaces for and applicable
ISO/IEC standards. The jacks are shown. Table 1 lists the transmission classes
and typical applications.
Table 1. Transmission classes, categories and interfaces
Transmission Connector
class ISO/IEC category
standards
Frequency
bandwidth
Typical Application
Connecting
Hardware
Interface
Class C
3
16 MHz IEEE 802.5 TokenRing
RJ 45
Class D
5e
100 MHz 10 to 1000baseT Ethernet
RJ45
Class E
6
250 MHz 100-1000 baseT
Class Ea
6a
500 MHz 1 to 10 GbE
RJ45
RJ45,
Class F
Class Fa
NA
7
600 MHz 1GbE over single pair
GG45, ARJ45
10 GbE
7a
1000 MHz 10 Gigabit over 2 pairs
ARJ45,
10 GbE over 100 m
NA
2000 MHz 10 to 40 GbE
ARJ45
Bel Stewart Connector 11118 Susquehanna Trail South Glen Rock, PA 17327 Tel: [phone]
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