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参数资料
| 型号： | TRM050SLAN |
| 厂商： | THOMAS BETTS CORP |
| 元件分类： | 电信和以太网连接器 |
| 英文描述： | 50 CONTACT(S), MALE, TELECOM AND DATACOM CONNECTOR, IDC |
| 文件页数： | 1/2页 |
| 文件大小： | 88K |
| 代理商： | TRM050SLAN |
Terminators
WHAT IS A TERMINATOR?
A terminator is a device which
terminates the end of a signal line.
Terminators can be internal to the
system,
or
they
can
be
in
a
separate configuration known as a
“TERMINATOR”. This is the preferred
configuration for expandable bus
systems
due
to
its
versatility.
Physically, terminators are connectors
with a resistor network or a resistor
and
current-voltage
regulation
network encased in a protective
overmold or shell assembly.
WHY USE A TERMINATOR?
SCSI terminators have two basic
functions; 1) establish the proper
voltage and current for signal line
operation;
2)
match
the
line
impedance and reduce reflection.
1. A terminator is an important
working partner for a driver. When a
driver pulls down the signal, a voltage
low (true state) terminator supplies
proper current to maintain the voltage
level and when a driver pulls up the
signal
voltage
high
(negate),
a
terminator helps a driver make a
quick and smooth negation.
2. Termination is needed at the two
ends
of
the
SCSI
bus.
The
impedance mismatches are generally
of greatest magnitude at the ends of
the bus. A terminator matches a bus
characteristic
impedance
and
minimizes the reflection.
GENERAL TYPES OF TERMINATION
There are two general methods of
accomplishing termination: passive
and active.
Passive termination systems make
use of fixed value resistors that place
a matching resistance at the end of
each signal line. This method is
satisfactory for many applications.
However, as signal speeds increase
165
Thomas & Betts Electronics/OEM Division Tel: 901-682-7766 Fax: 901-680-5200
INTRODUCTION TO
TERMINATORS
and noise margins decrease, passive
termination may no longer assure a
reliable signal transmission.
Active termination is the solution to
this challenge. It reacts to an active
negation driver and helps to make a
clean monotonic wave shape in a
high speed signal transfer by abilities
of sourcing and sinking current and
protecting a system by limiting
maximum current.
GENERAL CONFIGURATION OF
TERMINATORS
Terminators are available in two
general configurations: feedthrough
and
end-of-line.
A
feedthrough
termination typically installs between
an equipment I/O port and a ribbon
cable bus connector. This permits a
quick
and
simplified
change
in
peripheral devices within an existing
system configuration. This type of
configuration is used if there is no
provision for a pluggable terminator.
Although these terminators generally
appear as devices with an input and
output port, they may also have “no
ports”, in which case they are
crimped directly to the cable.
End-of-line terminators are installed
at the end of a line, and do not
continue the bus. The devise using
this type of terminator must have
both an input and output port.
In addition, terminators may be of a
shielded or unshielded construction.
Shielded terminators are generally
required
when
a
bus
in
used
“between” equipment cabinets. An
unshielded terminator, conversely, is
intended
for
use
“within”
an
equipment cabinet.
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