SS-15 BRI (ISDN 2 GSM) USER MANUAL
DOC. NO: SS-15-14 (REV. 01)
Page 12 of 26
When several ISDN devices are connected to an ISDN line, the line must end
with impedance matching resistors, also called terminal resistors. This is
required, for instance, when cascading several SS-15 interfaces and using
synchronization.
One solution for termination is to use a terminal block with matching resistors
inside. But if the last device is an SS-15 BRI, the termination resistors that are
included with the equipment can be used. Remember, out of several SS-15 BRI
units cascaded on the ISDN line, only the last unit must have the termination
resistors enabled.
Location
Figure 7. Location of JAT1, JAT2, JAN1 and JAN2 jumpers
The pairs of jumpers (JAN1 and JAN2 for the NT interface, JAT1 and JAT2 for
the TE interface) are located towards the right edge of the SS-15 BRI printed
circuit board, at middle-bottom. Each pair of jumpers is near a black rectangle
(ISDN transformers). JAN1 and JAN2 are the first pair; below them is the
second pair, JAT1 and JAT2 respectively. The jumpers are in horizontal
position.
4.7
POWER UP SS-15 BRI (ISDN 2 GSM)
Insert the jack of the power supply adapter into the PWR connector.
Plug the adapter into the receptacle of the 230V AC mains outlet. The SS-15
BRI (ISDN 2 GSM) will start working immediately. The green LED indicator
(PWR) should be lighting up.
Warning: To avoid accidents or damage to the equipment, follow the installation
steps described earlier. The supply plug of the adapter must be the last
connection made. Do NOT connect the cables for serial configuration, phone or
PBX while the SS-15 BRI (ISDN 2 GSM) unit is powered. Also, don’t take out
the antennas whole SS-15 is working.