Page 1
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
Roger Wu – Manager, R&D_1Approved By
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.
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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
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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.
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
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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
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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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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
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4.3. Test loops :
Loops to be used for testing in this test set-up are organized into two groups. This is
performed to obtain more specific requirements under the widely different conditions of
short and long loops and to evaluate the effect of the opposite Splitter impedance being
seen through the loop and effecting performance.
--Short loops:0.05Kft, 2.0Kft of pairs of 26 AWG cables.
--Long loops :ANSI T1.601 resistance design loops 7.9.13 and T1 TR28 CSA loops 4.6.7.8.
4.4. DC characteristic :
All requirement of this specification can be met in the presence of all POTS loop currents
from 0mA to 100mA. This in line filter can pass POTS tip-to-ring dc voltages of 0V to 105V
and ringing signals of 40V to 150Vrms at any frequency from15.3Hz to 68Hz with a DC
component in the range from 0V to 105V.
The DC resistance from tip-to-ring at the line port interface with the phone interface shorted,
shall be less than or equal to 25 ohms for one splitter.The DC resistance from tip-to-ground
and from ring-to-ground at the POTS interface with the U-R interface open shall be greater
than or equal to5 Megohms. The ground point shall be local building or green wire ground.
As an objective , the dc resistance should exceed 10MΩ.
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
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4.5. Electrical specification :
The low pass filter shall satisfy the following parametric limits shown in this table across the
Line side of this device .
Electrical requirements
Splitter parameter
Range values
Splitter bandwidth DC to 3.4KHz
Nominal voice band 0.3KHz to 3.4KHz
Billing tone 12KHz±80Hz
Ringing frequency 15.3Hz to 68Hz
ADSL band 30KHz to 1104KHz
Line Impedance ZL 900ohm
Modem impedance 30KHz< f< 1104KHz 100 ohm
Operation voltage voice
band
Nominal signal 21mVpp to 5.4 Vpp
Billing tone 10Vpp to 30.2Vpp
Ringing signal 40Vrms to 150Vrms(113Vpp to
424 Vpp)
DC voltage 0V to 105V
Max. AC voltage 150Vrms with -105VDC offset
Max. differential 320V
Current voice band
Loop current <100mA
Transient current(on/off hook) <150mA
DC Resistance
DC Resistance <=25 ohm
Isolation resistance tip/ring >5 Mohm
Voice –band characteristic
Insertion loss Short loop 1004Hz <1.0 dB
Long loop 1004Hz <0.75 dB
Attenuation distortion
(relative to 1004Hz) short loop
200Hz<f<3.4KHz +1.5dB
-1.5dB
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
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Electrical requirements
Splitter parameter
Range values
Attenuation distortion
(relative to 1004Hz) short loop
3.4KHz<f<4KHz +2.0dB
-2.0dB
Attenuation distortion
(relative to 1004Hz) long loop
200Hz<f<3.4KHz +0.5dB
-1.5dB
Attenuation distortion
(relative to 1004Hz) long loop
3.4KHz<f<4KHz +1.0dB
-1.5dB
Delay distortion 600Hz<f<3.2KHz <200 usec
0.2~4.0KHz <250 usec
Return loss short loop ERL >6dB
SRL-L >5dB
SRL-H >3dB
Long loop ERL >6dB
SRL-L >5dB
SRL-H >3dB
Longitudinal conversion loss
LCL
200Hz ~1KHz
>58 dB
1KHz~3KHz >53 dB
ADSL modem interface
Isolation voltage >2000Vrms for 1 minute
ADSL band characteristic
Stop band attenuation 30KHz<f<1104KHz >65 dB
Input impedance
loading of ADSL signal path 30KHz to 1104KHz <0.25 dB
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 9 OF 14
4.6. Test method :
4.6.1.Insertion loss at 1004Hz :
4.6.1.1. Description :
For each of the test loops specified in 4.3, and using the test set-up shown in Figure
2 .the insertion loss from the source to the termination shall be measured with and
without the splitter / ZHP combination inserted.The increase in insertion loss at
1004Hz on any of the test loops , due to the addition of the splitter / ZHP , shall be less
than specified in Table 1.
Table 1
Loss due to addition of splitter / ZHP
Description Loss
Short loop, ZTc=900, ZTr=600 <1.0 dB RT end
Long loop, ZTc=900, ZTr=600 <0.75 dB RT end
4.6.1.2. Test configuration:
Figure 2 defines the test configuration and the value of the test components that
shall be used for transmission measurements in the voiceband for the remote POTS
splitter.
Figure 2
Note :
1 : ZHP-r= the impedance presented to the POTS connector by an ATU-R
through the capacitor of the POTS splitter DC blocking capacitors.
2 : HP 33120A Function generator
3 : HP 54603B Readout oscilloscope
4 : DLS400 ADSL loop simulator
900ohm
Test loop
ZHP-r
ADSL port
Line
Phone
POTS
Splitter
Test
Equipment
600ohm
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 10 OF 14
4.6.2. Attenuation distortion in the voice band :
4.6.2.1. Description :
The variation of insertion loss with frequency shall be measured using the
configuration in Figure 3. The defined ZHP will be attached to the xDSL port of the
splitter. The increase in attenuation distortion , relative to the 1004Hz insertion loss ,
caused by the POTS splitter with the ZHP(or modem) load attached using each of the
test loops identified in 4.3 , shall be less than that
specified in Table 2.
Table 2
Increase in attenuation distortion caused by POTS splitter
Description Loss 0.2 – 3.4KHz Loss 3.4 – 4.0KHz
Short loop, RT splitter, ZTc = 900, ZTr = 600 +1.5 to –1.5 +2.0 to –2.0
long loop, RT splitter, ZTc = 900, ZTr = 600 +0.5 to –1.5 +1.0 to –1.5
4.6.2.2. Test configuration :
Figure 3 defines the test configuration and the value of the test components that shall
be used for transmission measurements in the voiceband for the remote POTS splitter.
Figure 3
Note :
1 : ZHP-r= the impedance presented to the POTS connector by an ATU-R
through the capacitor of the POTS splitter DC blocking capacitors.
2 : HP 33120A Function generator
3 : HP 54603B Readout oscilloscope
4 : DLS400 ADSL loop simulator
900ohm
Test loop
ZHP-r
ADSL port
Line
Phone
POTS
Splitter
Test
Equipment
600ohm
Page 11
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 11 OF 14
4.6.3. Return Loss :
4.6.3.1. Description :
The return loss of each splitter under the specified conditions, either with or without the
ZHP attached, shall be greater than the value specified in Table 3 :
Table 3
Splitter return loss
Description Zref Zterm
(Ω)
ERL
(dB)
SRL-L
(dB)
SRL-H
(dB)
Comments
RT splitter ZNL-r 900 6 5 3
RT splitter ZNL-r 900 N/A N/A 2 Single freq.
4.6.3.2. Test configuration :
Figure 4 define the test configuration and the value of the test components that shall
be used for impedance measurement in the voiceband for both the central office and
remote POTS splitter units.
Note :
1 : HP 4395A Analyzer or equivalent.
2 : Test fixture :HP87512A test fixture.
3 : DLS400 ADSL wireline simulator.
Where:
ZNL-r = 1330Ω in parallel with the series connection of a 348Ω resistor and a 100nF
Capacitor ( long loop model seen from RT)
ZHP-r = the impedance presented to the POTS connection by an ATU-r
Real cable
ZHP-r
ADSL port
Line
Phone
POTS
Splitter
Test
Equipment
900ohm
2.16uF
ZNL-r
Figure 4
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 12 OF 14
4.6.4. Longitudinal balance of POTS splitter :
4.6.4.1. Description :
This method shall be used to test a POTS splitter when it is treated as a separate
entity. The longitudinal balance of the POTS splitter(without loop), measured in either
direction between the POTS/PSTN and line port , as a two port device, In the case
where DC blocking capacitors are included as part of the splitter function on the xDSL
port, the xDSL port shall be shorted. Otherwise, the xDSL port shall be open. Because
of the maintenance signatures, the applied longitudinal voltage shall be maximum
3.0Vp-p. The balance shall be greater than 58 dB for frequency between 200Hz-1KHz
with a straight line level decreasing to 53dB at 3KHz. A DC bias current of 25mA will
be applied.
4.6.4.2. Test configuration :
Note :
1 : HP 4395A Analyzer or equivalent.
2 : Test fixture :HP87512A test fixture.
600ohm
600ohm
600ohm
600ohm
POTS
Splitter
ATU-r
Test
equipmen
Page 13
Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 13 OF 14
5. Environmental condition:
5.1. Resistibility to overvoltages and overcurrents:
The splitter has to comply with requirements as per ITU-T K.21.
5.2. Climatic conditions:
5.2.1. Operating temperature:
Application indoor
Long time operation guarantee temperature ( 5 to 40 0C )
Short time operation guarantee temperature ( 0 to 50 0C )
( According to ETS 300 019, class 3.2 )
5.2.2. Storage and transport:
Low ambient temperature - 20 0C
High ambient temperature +85 0C
( According to MIL-STD-202 method 107 )
5.2.3. Operation humidity:
Long time operation guarantee humidity ( 5 to 85 % )
Short time operation guarantee humidity ( 5 to 90 % )
Short time : within 72 continuous hours and 15 days in a year
6. Reliability conditions:
6.1. Thermal shock :
Temperature from -20 °C to +85 °C for 5 cycles
(According to MIL-STD-202 , method 107)
6.2. Temperature humidity exposure :
+50 °C /95RH , 96hrs
(According to MIL-STD-202 , method 103)
6.3. Vibration test :
Random vibration , frequency 5-500Hz , sweep time :1 hr / axis /
Force : 2.4grams (According to MIL-STD-202 , method 204)
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Product Specification
CPF120A
Data sheet subject to change without notice RDPS-POTS342(R3)09/11/2002
SHEET 14 OF 14
7 . Mechanical Condition:
7.1. Mechanical :
Note : (1)all tolerance : ± 0.25mm(0.001)inch
(2) color code for case:91H301B0
3
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