Mitel 430 - Primary Rate Interface PRI

System interfaces
30
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
2. 1. 2 Primary rate interface PRI
A primary rate access is a digital network interface for connection to the public network
or the private leased-line network. It can be set for the protocols DSS1 (public ISDN
network) and QSIG / PSS1 (private leased-line network).
A primary rate access has thirty 64 kbit/s user information channels and one 64 kbit/s
control and signalling channel (30B+D). One call or data connection can be set up on
each bearer channel (B channel) simultaneously and independently of the other B
channel.
Notes:
Primary rate accesses can only be used as point-to-point connections.
NT1: Network Terminal
U2/U/T2/T: ISDN reference points
30B+D: Primary rate access channels
2B+D: Basic access channels
DSI: Digital user-network interfaces
BRI-S: ISDN terminal interface
FXS: Analogue terminal interface
Fig. 7 System with basic and primary rate accesses
Fig. 8 Primary rate access in a private leased-line network: PINX-PINX connection
FXS
BRI-S
DSI
U
U
U2
2B+D
2B+D
30B+D
Commu-
nication
server
Channels
PRI
BRI-T
BRI-T
NT1
NT1
NT1
PINX 1 PINX 2
PRI
PRI
PRI