User guide

Port Assignment, Termination, Cable Length 51

Installation

IAE = ISDN wall socket (German ISDN „Anschluss Einheit”)

If the S0 bus is coming from the Forum 523/524 leading to one or

more IAE sockets, the terminating resistors (“TR”) in the

Forum 523/524 and in the most distant IAE socket needs to be

switched on.

If the cabling of the S

bus is realized with two lines, outgoing

from the Forum 523/524 and leading to several IAE sockets, the

terminating resistors (“TR”) in both most distant IAE sockets

needs to be switched on. The terminating resistors in the

Forum 523/524 must be switched off. The S

bus should not be

installed as star topology. Sub-distributions are not allowed

either.

Termination on an IAE socket: IAE sockets with built-in resistors

are recommended, because the terminating resistor can be

switched on or off with a mechanical switch. The figure shows how

to mount resistors in an IAE socket without switchable resistors.

You can add S

ports by installing appropriate S

interface cards

in a slot. These S

ports can be switched between internal and

external operating modes.

Line termination:

Enabled

IAEIAEIAE

Line termination:

Disabled

IAEIAEIAE