coM.sat ISDN Basic
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16/01/09 76 coMsat ISDN Basic Manual V2.7.doc
Note Protection Mark according to DIN 34!
then performed after about 100 seconds if no ISDN connection could be established.
If the watchdog is switched off, no reset occurs. In both cases the yellow LEDs
indicate the state of the ISDN connection. If there is a problem with the physical
connection, the yellow LED associated with channel 1 will be flashing. This indicates
a problem with the connected device, e.g. a wrong cable. If the logical connection
can not be established, the second channel’s yellow LED will be flashing. This
indicates most likely a configuration problem, e.g. a mismatch of point to point and
point to multipoint configuration.
If the optional power supply add-on board is installed, then it is possible to connect
telephones without own power supply directly to the NT port of the coM.sat ISDN
Basic. The add-on board features a DC/DC voltage converter that generates the
necessary voltage on the NT line. This is the same add-on board that also enables
synchronization from NT port and direct connection of the NT and TE port during power
failure, but it is available with or without power supply.
4.2 coM.sat ISDN Basic in TE mode
If a coM.sat ISDN Basic TA is to be operated in TE mode, the following connection
schematic results. This can vary depending on the TC system used, although the
principle arrangement is retained. In TE mode, the coM.sat ISDN Basic is installed
as an internal extension (TE), i.e. it is operated at the internal S0 bus and behaves
like a standard ISDN device. In this case, no synchronisation via the basic link is
necessary.
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