ALS-12 / ALS-M12 CPE ADSL Splitter / Micro-Filter

CPE ADSL Splitter / Micro-Filter

The ALS-12 / ALS-M12 are low-cost, compact, passive low-pass filters designed to provide POTS (Plain Old Telephone System) service to a line that is utilizing ADSL/VDSL technology. This device is designed to eliminate interference to POTS equipment by blocking high frequency energy (20 KHz~12MHz). The ALS-12 provides point of entry filter to split the incoming line to the ADSL/VDSL modem and the POTS telephone. The ALS-M12 is a micro-filter designed to simply drop a POTS telephone off a line carrying ADSL/VDSL signal.


  • Compact size
  • Consists exclusively of all passive elements
  • Designed for implementation of ADSL/VDSL CPE application
  • Handles all POTS loop current from 0 ~ 100mA
  • If the power of ATU-R fails, telephone service on the ADSL line will operate normally
  • Provides excellent isolation between DSL and POTS
  • The POTS splitter and Low-pass filter provides RJ-11 connectors for ATU-R/VTU-R and POTS interfaces
  • The POTS Low-pass micro filter provides RJ-11 connectors for ATU-R/VTU-R and Phone


Standard: Annex E.2 of ITU-T G.992.3
Impedance: 600 ohms
Insertion Loss: 1004Hz short loop: 1dB; 1004Hz long loop: 0.75dB
Attenuation: 200 ~ 3.4KHz short loop: -1.5 ~ 1.5dB
Distortion: 3.4K ~ 300KHz short loop: -2 ~ 2dB; 200 ~ 3.4KHz long loop: -1.5 ~ 0.5dB; 3.4K ~ 300KHz long loop: -1.5 ~ 1dB
Cut off Frequency: -3dB (10KHz)
ADSL Band: 30 ~ 300KHz: 65dB
Attenuation: 300 ~ 1104KHz: 55dB
Delay Distortion: 600 ~ 3.2KHz: 200us; 200 ~ 4.0KHz: 250us
Return Loss: ERL: 6dB; SRL-L: 5dB; SRL-H: 3dB
Common Mode Rejection Ration: 600 ~ 3.2KHz: -100dBb
Longitudinal: 200 ~ 1.0KHz : 58dB
Balance: 1 ~ 3KHz : 53dB
DC Resistance: 20 ohms
Isolation resistance to Earth: 5.0M ohms
DC current carrying capacity: 100mA
ESD discharge limits: 15k VDC
Tip to Ring Capacitance: 20nf
Dimensions: 34 x 45 x 24mm (D x W x H)
Weight: 70g
Temperature: -10~70°C (Operating) ,-15~80°C (Storage)
MTBF: 10~90% non-condensing

Live Demo of FRM220 Chassis

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