Topex MobiLink ISDN 2 GSM, Руководство пользователя

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TOPEX MobiLink ISDN2GSM User`s Manual
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For this, you can use a termination line jack (termination block) with
adequate impedance matching resistors (value is 100 ohm).
Alternately, if the last device is a MobiLink ISDN equipment, you may
use the embedded termination resistors. Both NT and TE interfaces of
the MobiLink ISDN equipment feature termination resistors which can
be configured by means of jumpers.
The pair of jumpers JAN1 and JAN2 connects the matching resistors
to the NT interface, while the pair of jumpers JAT1 and JAT2 connects
the matching resistors to the TE interface of MobiLink.
Figure 5-6 Location of JAT1, JAT2, JAN1 and JAN2
jumpers
By default, all jumpers are set, so termination resistors are connected.
Note:
Remember to take the jumpers OFF as required. In a
configuration with several ISDN terminals connected
together, only the last device in the line must have
termination resistors