ADSL / POTS
Splitter            YT-B

Low-cost splitters for separating ADSL and POTS in local exchange

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Fits directly to Tyco QDF-E  (Mondragon) terminals

Alternative for expensive rack mounted splitters

Considerable cost savings in materials and assembly work

VESALA

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Testing equipment for telecom professionals since 1968.

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The VESALA  YT-B splitter is designed to 
separate ADSL (Asymmetric Digital Subscriber 
Line) from POTS (telephone) when they are 
transmitted on a same wire pair and 

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terminated by means of Tyco QDF-E  
(Mondragon) MDF technology. The splitter 
protects POTS from interference caused by 
ADSL signals and equally protects ADSL from 
transients generated by, for example, POTS 
dialling and ringing, and from impedance 
fluctuations like off-hook / on-hook transitions.

Mechanical compatibility

Mechanical structure

Maximum ratings

Electrical compatibility

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Tyco QDF-E  -disconnection module.

Non-inflammable ABS enclosure, full length 

approx. 73mm (visible part approx. 

39mm), width 19mm, height 17.5mm. 

Tinned test plug reed connectors. Socket 

for Tyco test plug in the rear of the 

enclosure (see main image).

Operating voltages ±200V, DC loop current 

100mA (no over voltage protection 

included)

Complies with Telefónica Required 
Specifications GT.ER.E.0.0001.01 (DT-DTI-
BR) Rev. 01 * NOV.2002

HP filter specifications

120nF capacitors (optional)

LP filter specifications

<15

Ω

<0.2dB (distortion <0.5dB)

>20dB (300 - 2000Hz), >15dB (2000 - 

3400Hz)

>80k

Ω

 (at 25Hz)

Filter type

Additional loop resistance

Pass band insertion loss

Return loss

Ring impedance

Technical specifications

Separating ADSL and POTS

Saving costs with YT-B

The ingenuity of the design of YT-B splitters is 

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it they can be plugged into QDF-E  terminal 
blocks in a local exchange, one by one, as 
needed. Ordinary splitters require an operator 
to install large splitter racks and equipment 
awaiting possible future use. With YT-B only 
one terminal block is usually needed for five 
subscribers. All this results in considerable 
cost savings and allows unparalleled flexibility 
when ADSL/POTS usage ratio changes over 
time.

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YT-B is easy to install to QDF-E  test and 
measurement slots  - no tools are needed. 
The LP and HP filters of YT-B connect to 
respective pairs directly via contacts inside the 

terminal. Individual filters can be plugged into 
terminals adjacent to each other. Each YT-B 
requires a space of two pairs from a 10-pair 
terminal block. YT-B has symmetric mechanical 
shape, which allows best access to neighbouring 
terminals and their wire pairs. YT-B sticks out 
less than 40mm from the terminal block, which 
is an asset compared to bulky competitors.

Manufacturer:

H.VESALA Ltd.

Peräsimentie 1
FIN-03100 NUMMELA, FINLAND
Tel. +358-(0)9-2248 920
Fax. +358-(0)9-2248 9230
Email: info@vesala.fi
Web: www.vesala.fi

© H.VESALA Ltd. 4405. Subject to change without notice.

Notes: YT-B is a new product  - please consult us for 

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availability. All specifications are preliminary. VESALA  
is a registered trademark of H.VESALA Ltd, Finland.

Filter operation

YT-B splitter contains 4th order passive low-pass 
filter and 1st order high-pass filter. Attached 
diagram shows a typical ADSL band insertion 
loss curve. Impeccable return loss properties 
prevent unwanted POTS echoing.