Siemens SCALANCE M812, Руководство по эксплуатации

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Contact Assignment
+DO Switching signal
Relay 24 V DC / 1 A
-DO Ground
The output is a switch that switches the signal at +DO to ‑DO.
5.5 SHDSL connection
CAUTION
Risk of fire
To reduce the risk of fire only use telephone cable with 26 AWG (0.125 mm
2
) or larger.
NOTICE
Overvoltage protection
If the SHDSL cables are laid outdoors, voltage surges, for example as a result of lightning strikes
are possible. To avoid dangerous voltage surges, additional lightning protection measures
need to be taken, for example by installing additional lightning protectors.
The following lightning protectors from DEHN are suitable:
• 2-wire operation: BXT ML2 B 180, article number 920 211
• 4-wire operation: BXT ML4 BD HF 24, article number 920 375
Manufacturer:
DEHN+SOEHNE GmbH+Co.KG Hans Dehn Str.1 Postfach 1640 D‑92306 Neumarkt, Germany
Any cable shields must be grounded where the enter the building. The lightning protection
measures should be undertaken by qualified specialists to ensure the correct installation /
functioning of the lightning protection.
2-wire mode
Connect the 2-wire cable directly to the first terminal block (X1) of the device.
The following table shows the maximum possible data transmission rate depending on the
distance (standard ITU-T G.991.2).
The data rate that is actually possible depends on the following parameters:
• the cable cross-sectional area
• the cable quality
• the cable length
• the age of the cable
Connecting up
5.5 SHDSL connection
SCALANCE M826
Operating Instructions, 10/2022, C79000-G8976-C362-07
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