SDN
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the eye of your ISDN line for the Basic Rate Interface (BRI)*) |
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Updated 2018-01-15T04-10Z |
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SDN
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Frequently asked questions (FAQ list)
I don't like the casing. Is there another one?Are there different colours as well? Red would be quite beautiful.
Does an extension cord come with eyeSDN?
May I replace the provided 1 m long inlet by a line that is 2...3 m long?
Does eyeSDN work only with the external S/T bus or at the internal S/T bus as well?
My NT1 is not plugged to the mains line. Can my CPI supply eyeSDN as well?
Is eyeSDN compliant to T-DSL?
When I replace the receiver, eyeSDN nevertheless continues to light up. Is something wrong?
What do I have to do, that the lamp is not always lighting up?
I've got a 'Eumex'. Does this device comply with eyeSDN?
Is your question missing? Post it here!
Not yet. But there is no limit set to your phantasy. Certainly, in a toys shop, you'll find a doll or an animal or a flower to put eyeSDN into fancy dress.
Yes and no. The pupil is green. Red, yellow, and blue are available. The iris is not cheap and must remain green for the time being.
A 1 meter long inlet is attached to the TE1 eyeSDN. It does not serve as an extension, rather for more convenient handling of the eyeSDN - as it is the case with other TE1s. It is that short so the rules of the correct high-frequency network termination of the S/T bus are not violated yet**). If one would make the inlet longer, then - because of the increased mismatch - the ISDN operation could become unreliable.
If one installs the optional duplex jack in addition to the eyeSDN, then one gets - after having put the eyeSDN's plug into one of the two outlets of the duplex jack s - an "extension" of the length zero: Then a plug and an outlet jack remain vacant at the duplex jack. This arrangement can be easily inserted into the existing connection of an already available TE1:
This may still work, as long as the high-frequency mismatch does not become too large thereby**). Other devices have similarly long inlets. Pay attention for the sake of whether your system becomes unreliable.
From autumn 2000 on, there is eyeSDN with built-in 100 Ohm resistors and two jumpers (for experienced users only!), to be able to explicitly terminate the S/T bus:
The simplest way of connection is to the vacant (second) jack of the NT1:
If the NT1 is mounted at an inconvenient place, then one can provide the missing vacant jack by inserting a duplex jack into the S/T bus inlet of an arbitrary TE1 (be it the PBX or the ISDN telephone or a TA or the ISDN board in the PC or ...):
At whichever position on the S/T bus eyeSDN is attached - in any case the rules of the correct high frequency network termination at the two outermost ends of the S/T bus have to be adhered to, so that the ISDN operation does not become unreliable**). In this respect, eyeSDN has not to be handled differently from any other TE1, which can be attached to the S/T bus.
Both buses have the same physical characteristics and therefore fit to eyeSDN. However, keep in mind to provide sufficient power supply.
It makes little sense to install eyeSDN on the internal S/T bus, since you probably want to uncover attacks on your purse. Therefore eyeSDN has to monitor the external S/T bus - it is that S/T bus, which is next to the switching center (where the cost accounting takes place), thus the S/T bus at the NT1.
As long as it is not lighting up, eyeSDN needs almost no power. When the display lights up, eyeSDN consumes 450 milliWatts. That is only as little as a telephone needs, which is able to operate in Restricted Mode, and is indispensable to make the display light up brightly enough. Both the NT1 and even more the usual PBXs can supply such a TE1 easily in addition. If you are in doubt, because very hungry TE1s hang on its S/T bus, you can sum up all consumptions and check whether the 4.5 Watts from the NT1 - or more from your PBX - are sufficient. There are also boosters which do nothing else but supply the S/T bus with additional energy.
Keep in mind: In Restricted Mode, eyeSDN remains always dark and needs no energy.
According to your description, it is to be assumed that the CPI supplies the internal S/T bus only with energy. Then, the external S/T bus runs (if the power supply of the NT1 is not plugged to the mains outlet) in Restricted Mode, and the eyeSDN attached there remains dark as intended, so the emergency supply remains available for the emergency telephone.
It makes little sense to install eyeSDN on the internal S/T bus, since you probably want to uncover attacks on your purse. Therefore eyeSDN has to monitor the external S/T bus - it is that S/T bus, which is next to the switching center (where the cost accounting takes place), thus the S/T bus at the NT1.
In order to allow eyeSDN to light up at all, this S/T bus must be supplied with energy for the Normal Mode - whether from the NT1 or from the PBX, does not matter then.
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For the professional reinforcement, figure 2 in the
data sheet SIEMENS PEB2080
is suitable with regard to "Mode 'NT'":
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Some English technical terms in German (by
http://www.cis.ohio-state.edu/~jain/cis788-95/isdn/index.html, http://www.scan-technologies.com/tutorials/ISDN%20Tutorial.htm, http://www.t-versand.de/isroot/tversand/static/lexikon/lexikon.html et al.): |
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Rough automatic translation (click one of the 2 banners immediately here below):
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