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Connecting Devices
Besides the Eumex 704PC LAN, you can operate additional ISDN terminals (e.g.
ISDN telephones) on the NTBA. To simplify the connection of additional devices, you
will find an external S
0
port on the lower side of the Eumex 704PC LAN. This is the
looped-through S
0
bus from the NTBA.
You can use the external S
0
port to connect an additional ISDN terminal or a multiple
ISDN socket for more than one terminal. A fixed installation from the NTBA should
only be done by a qualified electrician.
Additional Terminals on the S
0
Bus
• Power on: your Eumex 704PC LAN is operational.
• T-ISDN is illuminated: the NTBA is operational.
• T-ISDN flashes: the NTBA is not operational.
• B-channel 1 is illuminated: B-channel 1 is busy.
• B-channel 2 is illuminated: B-channel 2 is busy.
• Message flashes: there is a voice or fax message in your T-NetBox (also see the
note on p. 53).
• Call data is illuminated: your Eumex 704PC LAN has saved between 1 and 39 call
data records.
• Call data flashes: your Eumex 704PC LAN has saved between 40 and 50 call data
records. Note: when 50 call data records have been saved, each new record over-
writes the oldest one.
• Call data is not illuminated: no call data records have been saved.
• Router on: one of the connected PCs is connected to the Internet via the router.
Interpreting the LEDs
NTBA
T-ISDN External S
0
Eumex 704PC
LAN
Eumex 704PC
LAN
Additional terminals
S
0
bus