C) Isdn Connection - Teldat Atlas 250 Installation Manual

c) ISDN Connection

The ISDN interface presents an RJ45 female connector to connector the 4-wire S bus coming from the
ISDN network terminator (NT1 or TR1).
You can use a flat cable with RJ45 male connectors, provided with the device for connection purposes.
Passive-Bus terminal resistances
The Atlas250 routers have a pushbutton (labeled as "TERM") in order to connect the BUS-S
termination resistances. The placing of these terminal resistances in the correct position is important
as contrariwise this can lead to errors in data (or voice), particularly if the "S" bus line is long. On
leaving the factory, the pushbutton, by default, is in the "ON" position.
• The only or last terminal in the ISDN "S" bus
The "TERM" pushbutton must be in the ON position if the router is the only eleme nt connected
to the network terminal (NT1, TR1, etc) or is in the last position on the ISDN "S" bus.
hecho por M.A. Berrojo
Teldat
• Intermediate position in the ISDN "S" bus
The "TERM" pushbutton must be in the OFF position if the router occupies an intermediate
position in the ISDN "S" bus.
Figure 5. Location in an intermediate position in the bus
Atlas
Figure 4. Location as the only or last terminal
he ch o po r M.A . B e rrojo
T e ld at
ATLAS 250 – Installation Manual
5
NT1 / TR1
U interface
S interface
(2 wires)
(4 wires)
NT1 / TR1
U interface
S interface
(2 wires)
(4 wires)
A tlas
ISDN
ISDN
Doc.DM698-I
Ver.2.0