Introduction To Telecom Transformers
The applications that demand high
bandwidths and fast switching speeds Telecom transformers are utilized. It is
used to isolates the signal between primary and secondary windings. There are
several types of telecom transformers normally used. Few of transformer options
include DSL , xDSL , E1 , T1 , ISDN , LAN , WAN & ATM transformer models. A
lot of Modern transformers are also available Rigid flex PCB. A DSL or xDSL
transformer uses the digital subscriber loop (DSL) or extended digital subscribe
loop (xDSL) for telecommunication protocols (Broadband). A T1 or E1 type of
transformer is designed to use along with a T1 line or an E1 line. An ISDN type
of transformer is the usual telecommunications transformer used for integrated
tele-services digital network (ISDN), ISDN is an international standard for the
digital transmission of voice and data. A LAN type of transformer is designed
for use in a local area network (LAN) PCB Prototype, while a WAN type is
used in a wide area network (WAN). An ATM type of transformer works with
asynchronous transfer mode (ATM).
Performance specifications for any
telecom transformers include the range of operating frequency, direct current
resistance, insertion loss, high potential (hipot) level, 3-decibel (dB)
bandwidth, operating temperature, and maximum dimension.
Direct current
resistance or commonly known as DCR is the resistance of the telecom
transformer's winding as measured with DC current. It is commonly specified as a
maximum rating. Insertion loss is the measured loss through the device excluding
the power division factor. It is measured in dB and calculated as the ratio of
output power to input power. HIPOT level is the maximum voltage a telecom
transformer can take without breaking the winding. 3 dB bandwidth is the
frequency range.
Telecom transformers usually differ in terms of package
type and method of packing. Integrated circuit (IC) package types include flat
pack, single in-line package, dual in-line package, and small outline integrated
circuit.
Board-level telecom transformers can employ either surface
mounted technology or through hole technology. SMT adds components to a PCB by
soldering component leads on to the top surface of the board. Through-hole
technology fixes the components by inserting leads through holes and then
soldering the leads in place on the other side of the board.
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