The CPF140G is a splitter module that has been specifically designed to implement the
The CPF140G is a splitter module that has been specifically designed to implement the
functionality of low pass filter in ISDN with 2B1Q over ADSL application.
The CPF140G integrate low pass filter that block the high frequency energy from reaching the
ISDN device and provide isolation from impedance effects of the ISDN device on ADSL.
Because the ISDN 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 splitter to protect against line overstress which
could damage the splitter itself.
The splitter has to comply with requirements as per ITU-T K.21.
Electrical Specification:
All of electrical specifications for ISDN path stated herein must be met and satisfied separately
for single individual splitter and also for the complete splitter combination.
Electrical requirements
Splitter parameters Range values
ISDN band(3dB bandwidth) DC to 94 kHz
Nominal impedance
Line impedance ZL 135 ohm
CO impedance ZTc 135 ohm
RT impedance ZTr 135 ohm
Modem impedance 100 ohm
Operation voltage ISDN
For 2B1Q Band Current voice band
Current voice band
Loop current 100 mA
DC resistance
DC resistance <=25 ohm
Isolation resistance tip/ring >5 M ohm
ISDN band characteristic
Insertion loss(aBE/EB) 0.1 kHz <f<80 kHz <1.1 dB
Delay distortion 0.1 kHz <f<84 kHz <20 usec
Return loss CO splitter 0.1 kHz<f<84 kHz >18 dB
Return loss CPE splitter 0.1 kHz<f<84 kHz >18 dB
Longitudinal conversion loss LCL >45 dB
Line interface
Return loss line interface 0.1 kHz <f<84 kHz >18 dB 120 kHz >40 dB
Attenuation 138 kHz >60
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