System interfaces
47
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
2. 2 Terminal interfaces
The communication server supports digital and analogue user-network interfaces.
2. 2. 1 Digital user-network interfaces
On each of these digital user-network interfaces several appropriate terminals can be
hooked up and operated simultaneously.
2. 2. 1. 1 Terminal interface BRI-S
The S user-network interface is a digital 4-wire interface used for connecting ISDN ter-
minals, Terminal Adapters and ISDN PC cards. Each of these interfaces has two 64
kbit/s user information channels and one 16 kbit/s control and signalling channel
(2B+D). This makes it possible to establish two independent call or data connections
simultaneously.
Fig. 18 Terminal interface BRI-S
Up to 8 terminals can be operated on an S user-network interface. They are addressed
with the single-digit terminal selection digit (TSD).
Different modes are available for operating the BRI-S interface ( BRI-S protocol in
the interface configuration):
•The ETSI mode is used to operate ISDN terminals, Terminal Adapters and ISDN PC
cards.
• With the BRI-S external mode a BRI-S interface can be used as a basic access for
private networking with QSIG / PSS1 or DSS1. It is no longer available as terminal
interface (see "Basic rate interfaces BRI-S external", page 25
).
4
ETSI
4
PC
4
ETSI
PINX
PINX
BRI-S
BRI-S
BRI-T
ISDN terminals
BRI-S
ext.
To Next Page
Loading...
