Updated 2018-01-15T04-10Z

[Ordering] [Frequently Asked Questions (FAQ)] [Press Release] [Imprint] [eMail] [Site Map] [Personal Home Page] [Glossary] [German] [Translate]

eye eyesdn.gif (20214 Byte) SDN
 For a rough automatic 
 translation, click here
the eye of your ISDN line for
the Basic Rate Interface (BRI)*)


  • helps you save on phone costs;
  • tells - in Normal Mode - whether the Customer Premises Installation (CPI) is doing something;
  • supports the installation work;
  • helps with error detection.


  • detects data theft;
  • reports every activity on the S/T bus;
  • is independent of the data protocol;
  • does not use any more energy than a Terminal Equipment 1 (TE1);
  • hardly uses any energy in Restricted Mode.


eyeSDN serves as a detector of activities on the S/T bus of a Basic Rate Interface (BRI)*). As soon as a data transfer is taking place (or even a sufficiently large spurious signal is present), the indicator lights up. E. g. a fax is coming or ...

Examples of suspect activities:
  • A receiver is not correctly replaced.
  • Your computer is inadvertently still on-line.
  • Your children/cats play with the telephone.
  • Your computer establishes unnoticed connections and/or doesn't quit them.
  • The neighbour telephones with a cordless phone at your expense.
  • A hacker forces an entry through the service access.
  • Somebody is listening in from another telephone.
  • Someone is tapping the S/T bus.


Be certain that the power supply plug of your NT1 is plugged into the mains outlet, or the S/T bus is otherwise supplied sufficiently with energy for the Normal Mode.

Connect eyeSDN to the S/T-Interface jack, e. g. to an S/T-Interface jack in the NT1 of the Post Office

- or -
connect your Terminal Equipment 1 (TE1, e. g. your telephone) and eyeSDN by a duplex jack to the S/T-Interface jack.

eyeSDN does not use more energy than a Restricted Mode compliant Terminal Equipment 1 (TE1), therefore you can attach several eyeSDN at different workstations, where you usually stay.

If the procedure "AlwaysOn/DynamicISDN (AO/DI)" - e. g. T-ISDN @ctive or Notifyer - might be active in your system, then the indicator lights up continuously.

In order to enable the selective ability of eyeSDN, AO/DI must not be active.

Also, without AO/DI, there are sorts of Terminal Equipment 1 (TE1) or Private Branch Exchanges (PBX), which do not leave the S/T bus in peace during inactive phases, so the display lights up continuously (see also inside the FAQ list).

Therefore, buy equipment only with right of return (as for instance with CONRAD), until its compatibility is verified.

See also inside the FAQ list: http://www.moses-electronix.com/eyesdn/eyefaq1_eng.shtml#list.

Installation at the NT1


53 g
in Normal Mode: 450 mW
in idle state: 5 mW
Data protocol:
DSS1, 1TR6 and others
Polystyrene (="PS")
weeeapiv.gif (2364 Byte)

Extent of delivery:

image2s.jpg (11964 Byte)
  • eyeSDN
  • 1 meter of ISDN cord
  • 2 sticking cushions for self adhesive attachment (see picture)
  • 1 description (this text)


in Germany 35.70 €
(= 30.00 € net + 19% VAT) / abroad (net) 30.00 € = 20.00 £ = 40.00 $ / Forwarding expenses see here

Made in Germany
Supply from stock**) 2 weeks right of return 2 years warranty
Ordering Consumer's Information



Duplex jack - price in Germany 5.36 € (= 4.50 € net + 19% VAT) / abroad (net) 4.50 € = 3.00 £ = 6.00 $
image1o.jpg (12275 Byte) Obtainable likewise from - for example -
  • CONRAD as ISDN-FESTADAPTER WE8/8-2xWE KU 8/8 under part number 281823
  • MISCO as T-ADAPTERSTECKER RJ45 8-POLIG & 2 FASSUNGEN under part number 1289
  • RADIO SHACK as 8C TO 8C ADAPTER #2790457 under part number 279-457

For restricted space available, a flexible version may be necessary. They exist in retail trade at one and a half up to three times the price. Even a 2-fold gender changer may be useful, e. g. CONRAD 261025.


*) On ordering your ISDN access you have selected the type of interface. If you have rented continuous monitoring, or an Extended Rate Interface instead of a Basic Rate Interface, then

- because of the continuous monitoring - the data traffic with the switching center of the telephone service provider stops only in case of fault. Then, eyeSDN is a mere Normal Mode indicator:

It does not distinguish between connection breaks and (perhaps suspicious) connections, but between Normal Mode and Restricted Mode.
**) To the EU until 2005-11-23 only

Idea: Dipl. Ing. Bernhard Rath 
atelier.gif (2 KBytes)
Implementation: Dipl. Ing. Michael M. Iloff 
MOSES' logo (4 KBytes)

Cool links:

Made in China 
(2 Kbytes PNG)
Search strings for full-text search engines, which do not scan Meta keywords:
moses electronic, eyeSDN, eyeISDN, eye ISDN, eye-ISDN, ISDN, telephone, S/T bus, save, costs, cost trap, prevention, prevent, watch, guard, ISDN guard, monitor, ISDN monitor, hardware, traffic detector, ISDN traffic detector, anti-dialer, dialer protection, eye, security, protocol, DSS1, 1TR6, hacker, cracker, data theft, data thief, gift, advertising, birthday, Christmas, Xmas, Valentine's day, birthday present, Christmas present
Some English technical terms in German (by
http://www.t-versand.de/isroot/tversand/static/lexikon/lexikon.html et al.):
S/T interface has been acquired
Aktivität auf dem S0-Bus
Basic Rate Interface (BRI)*)
Mehrgeräteanschluss (=Basisanschluss)
Network Termination 1 unit (NT1)
Network Termination for ISDN Basic Access (NTBA), Netzabschluss für den Basisanschluss
U bus
S/T bus
S/T-Interface jack
duplex jack, dual outlet adapter
Private Branch Exchange (PBX), Terminal Adaptor (TA), Customer Premises Installation (CPI)
Terminal Equipment 1 (TE1)
Multiple Subscriber Number (MSN)
Mehrfachrufnummer am Mehrgeräteanschluss*) (MSN)
Normal Mode
Restricted Mode
Rough automatic translation
(click one of the 2 banners
immediately here below):


[Ordering] [Frequently Asked Questions (FAQ)] [Press Release] [Imprint] [eMail] [Site Map] [Personal Home Page] [Glossary] [German] [Translate]