Filter
Top Products
Server Cards IMACS System Release 5.1.6 4-3
ACS-PRI/BRI Card Introduction
4.1.1.8 Trunks
An ISDN trunk is a logical division of B channels pertaining to a D channel. It consists of one
or more contiguous or non-contiguous B channels. All B channels in a trunk must belong to
the same D channel. However, a trunk may be assigned across different physical interfaces
when NFAS is used.
4.1.2 Selecting D Channels, B Channels, and DS0s
The D channel configuration screens described later in this chapter show how to configure D
channels, assign B channels to one or more D channels, and how to identify dedicated DS0s
that cannot be used as B channels. This section will give a few examples of applications that
would require various combinations of D channel(s), B channels, and DS0s.
Figure 4-1 shows an application where a single D channel performs ISDN signaling for 8 T1’s
worth of B channels (191 B+D). There are actually 8 separate T1 facilities: seven with 24 B
channels each, and one with 23 B channels and one D channel.
Figure 4-1. ISDN Channels: 191B+D
1 Facility With 23B+D7 Facilities With
24B Each
Carrier
ISDN Switch
IAD
CAUTION:
For continued
protection against fire,
replace only with the same
type and rating of fuse
Premisys Communications, Inc.
Model IMACS/600
T 5A
250V
IEC
Fuse
5A SB
250V
UL/CSA
24/48V 5A
LISTED 9K09
LR 77063
120-200-240V
~
3A, 50 / 60 Hz
Telephone
Equipment
Class 2 Power Source
®
®
U
L
+
-
+
-
+
-
R
G
R
C
O
M
V
N
V
B
V
A
HSU-T
530/35
S 60
HSU-T
530/35
S 60
HSU-T
530/35
S 60
HSU-T
5
30/35
S 60
HSU-T
530/35
S 60
HSU-T
530/35
S 60
BRI
HSU
530/35
S 60
P
2
P
1
P
4
P
3
FXO
8139
N
O
D
E
T
E
R
M
C
O
M
P
P
1
P
1
CPU
CLOCK
NVRAM
W1-1
CSU
W1-2
DSX
WAN
IF
T1+DS1