YCL CPF120A Datasheet
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 1 OF 14
File No RDPS-POTS342
Revision R3
System Application Asymmetric Digital Subscriber Line
Product Type POTS Splitter For ADSL CPE side
Product Name CPF120A
Date Sep. 11th, 2002
Jay Hsieh - Design Engineer, R&D_1Issued By
jay@ycl.com.tw
Roger Wu – Manager, R&D_1Approved By
Roger@ycl.com.tw
Issued Date
YCL Electronics Co., Ltd.
No.95, Feng Jen Road. Feng Shan City, Kaohsiung, Taiwan, R.O.C.
This controlled document is the property of YCL Electronics Co., Ltd. Any duplication
reproduction or transmission by unauthorized parties without the prior written
permission of YCL Electronics Co., Ltd. is prohibited.
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 2 OF 14
Table of contents
Item Description Page
1 Introduction
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3
2 Reference
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4
3 Abbreviations
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4
4
Technical requirements
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5
4.1 : Schematic
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5
4.2 : ZHP-r definition
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5
4.3 : Test loops
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6
4.4 : DC characteristic
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6
4.5 : Electrical Specification
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7
4.6 : Test Method
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9
4.6.1 : Insertion loss at 1004Hz
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9
4.6.2 : Attenuation Distortion in the Voice Band
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10
4.6.3 : Return loss
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11
4.6.4 : Longitudinal balance of POTS splitter
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12
5 Environmental condition
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13
5.1: Resistibility to overvoltage and
overcurrents
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13
5.2 : Climatic condition
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13
5.2.1: Operating temperature
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13
5.2.2 : Storage and transport
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13
5.2.3 : Operating humidity
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13
6 Reliabilty conditions
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13
6.1 :Thermal shock
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13
6.2 : Temperature humidity exposure
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13
6.3 : Vibration test
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13
7 Mechanical design
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14
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 3 OF 14
1. Introduction :
The CPF120A is a splitter module that has been specifically designed to implement the
functionality of low pass filter in POTS over ADSL application at CPE side.Asymmetric Digital
Subscriber Line (ADSL) technology is dedicated , point to point , public network access
technology that allow multiple forms of data , voice , and video to be carried over twisted-pair
copper wire on the local loop between a network service provider’s(NSP’S) central office and
the customer site or on local loops created either intra-building or intra-campus. Best of all ,
ADSL delivers this high speed performance over existing copper telephone line all while
allowing traditional voice service to coexist without interruption through POTS low pass filters.
The POTS-splitter on the customer premises side consists of a lowpass section(installed in a
separated plastic box).
The CPF120A integrate low pass filter that block the high frequency energy from reaching the
POTS device and provide isolation from impedance effects of the POTS device on ADSL. In
addition , these filter will also attenuate any wideband impulse noise generated by the POTS
device due to the interruption of loop current(e.g. pulse dialing or on hook / off hook transfer)
Because the POTS splitter connects directly to the subscriber loop media , it must also
provide some protection for externally induced line hits or faults which could damage any
attached equipment or endanger humans interacting with the installed equipment.The circuit
protection will be provided mostly by standard central office line protection means and
additional protection measures built into pots splitter to protect against line overstress which
could damage the splitter itself.The POTS splitter and LOW-pass filter shall be passive
element .Even if the power supply or equipment fails, the telephone service on DSL line shall
operate normally.
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 4 OF 14
2 . Reference :
Ref. 1 : ETS 300 001 Attachment to Public Switched Telephone Network
Ref. 2 : ANSI T1.413 G992.1 Network and Customer Installation Interface
Ref. 3 : GR-1089-CORE Electromagnetic Compatibility and Electrical Safety
3 . Abbreviations :
ADSL Asymmetric Digital Subscriber Line
CO Central Office
CPE Customer Premise Equipment.
POTS Plain Old Telephone Service
RT Remote Terminal
ADSL-NT Network termination of ADSL
ERL Echo Return Loss
SRL Singing Return loss for low frequency
SRL-H Singing Return loss for high frequency
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 5 OF 14
4 . Technical requirement :
4.1. Schematic :
The following drawing illustrate the block diagram of this product.
4.2. ZHP-r Definition :
ZHP-r is defined to be the impedance presented to the POTS connection by an ATU-R .The
equivalent circuit of ZHP-r is showing below . The ZHP-r is valid only for voice band
frequencies. The combination of capacitors in the ZHP-r is only representative
0.47mH
0.10µF
100 ohm
0.10µF
0.12µF
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