A plus 220-1001 – Exam Objective 3.2 – Dumps4shared

A plus 220-1001 – Exam Objective 3.2

A+ Exam Objective 3.2

3.2 Identify common connector types.

Welcome to Exam Notes by Dumps4shared! In this article, we will cover Core 1 objective 3.2 Identify common connector types.

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Twisted Pair Connectors and Ethernet Wiring

Now we’ll look at the copper network cable types. Once the most
exhaustive connection method you would need to know for A+, the 802.3 series of
cables are now being replaced by Fiber and Wireless. Nevertheless, copper
network cables are still heavily used in the field with many networks running
RJ-45 and wireless networks covering the same areas. Here we will look at the
two main twisted pair implementations, RJ-11 and RJ-45. Here is how the
connectors compare.

RJ-11 This connector supported the early
10BASE-T networks and Voice Grade telephone connections with 6-pin capability.
While still used in telephone implementations, RJ-11 has been surpassed in
networking by RJ-45which will be described later. RJ-11 supports speeds of 10Mbps,
which is adequate for voice, but highly inefficient for networking which can
attain speeds of 1000Mbps.

RJ-45 This connector succeeded RJ-11
for network use. RJ-45 uses four twisted pairs of wire configured to reduce
cross-talk and other cable related problems. In its initial configuration, RJ-45
was capable of matching RJ-11 speeds, 10Mbps, which was the standard for the
time. Keep in mind how the RJ-45 connectors are wired. There are two dominant
wiring pinouts: T-568A and T-568B.

T – 568 A & B detail

Changes in network hardware made it possible for this connector
to reach speeds of 100Mbps. As the technology has advanced, even greater speeds
can be attained by making enhancements to the internal configuration of the
connector and the cable while leaving the original shape and size of the
connector unchanged.


Another network cable option is Thinnet or the RG-58 variant.

RG-58 Coaxial

This 10BASE2 connector and cable were harder to manage than its
10BASET cousin. It used BNC connectors and a somewhat less manageable shielded
copper core cable. RG-58 matched the 10Mbps speed and had a longer range, but
it was difficult to implement the required bus topology and required a T
connection at each host, along with termination at the cable ends, to prevent
signal reflection.

F- Connector

Your objectives call for knowledge of the F-Type connector. This
connector is not as much a network connector as it is a video connector. Your
Home Media Center PC will require this connector in order to connect your cable
or antenna system to it.

F Type

An RG-6 cable uses an F-type connector. It is similar to BNC, however
the F connector screws onto the component, creating a connection where a
failure point will most likely be the cable itself rather than at the
connection point. The connection is strong and extremely unlikely to pull out.

RS-232 / DB-9

The RS-232 cable is used for serial communications. It has a
9-pin configuration and supports PC to router/switch connections over a null
modem cable. Similar legacy serial connectors can support peripherals such as the

RS-232 connector

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USB Cable End Details

When looking at the cable ends presented above, the most
significant features would be what you’d expect: shape, color, and size. Changes
began with USB 2.0 where the need for a standard connector for portable devices
such as smartphones was apparent. Before this modification, each manufacturer
had to design their own ”B” end of the cable because the standard connector was
 twice the size of the device! Eventually, the USB 2.0 mini connector and
the USB 2.0 micro connector (see table above) was designed to solve this issue.

Evolution of the USB Connector

During the development and enhancement of FireWire[, development speeds reached 800Mbps! We found ourselves in the position where market domination was inevitable but it didn’t happen. What went wrong?

There were two developments that hindered FireWire adoption. The
first, not too surprisingly, was greed. Apple was preparing to impose a $1 per
port royalty on FireWire connections. They eventually opted not to impose the
charge but it was too late as it had left a bitter taste with the consumers.
Second, there was a generation of FireWire only iPods. These new devices would
only accept Fire Wire connections. Customers seeking only to upgrade their
music player were forced to upgrade their computer to FireWire as well! Hmmmmm.
This is not one of the major points but it certainly bears some scrutiny.

When FireWire 800 was developed, there was no consideration for
backwards compatibility. In contrast when USB upgraded from 1.1 to 2.0, compatible
connectors were used. For the end user, this greatly simplified their migration
to the new technology.

With the introduction of the USB-C connector, one of the main
user complaints about the USB mini and micro connectors was solved. The shape of
mini and micro USB connectors had a top and a bottom and as a result, these
connectors could only be inserted one way. USB-C connectors are reversible, having
upper and lower contacts, and can be inserted easily without a struggle. USB-C supports
the USB 3.0 and USB 3.1 standards. However, USB-C is not backwards compatible.

USB-C connector

Apple’s proprietary Lightning cable shares the same
reversible properties as the USB-C connector. We can see the port on the device
has upper and lower connectors.

Lightning cable and


Next, we see a DB-25 external SCSI connector. This connector
supports parallel communication between peripherals and also for RS-232
connections. This cable and connector can be distinguished by the opposite
cable end. A printer will use a Centronics connector on one end and a DB-25 on
the other.

External SCSI DB-25 connector by Smial: https://commons.wikimedia.org/w/index.php?curid=1009571


Because of its
flexibility, the SATA interface can connect externally to the machine using an
eSATA port. In the table, you can see the internal SATA Data and power
connectors. Many SATA devices ship with a MOLEX-to-SATA adapter cable for
power. eSATA connects external devices. You can distinguish the SATA from eSATA
by noting the L shaped SATA connector. The eSATA connector has a straight
rectangular interface and an external rib on each side of the plug. This
feature prevents improper insertion.

SATA and eSATA connectors (Image Smial CC by-SA 2.0 de (https://creativecommons.org/licenses/by-sa/2.0/de/deed.en)

Molex-to-SATA Power

Below, you can see a typical Molex-to-SATA power connector.
The white Molex connector supplies power for two SATA devices.

Molex-to-SATA power

 That’s all for Objective 3.2! Good luck on the test.

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