ACB-100 Audio Control Board
Document IM-ACB-100-2.5
Page 5
while the others will act as “slave” ACBs. With the ACB-100 this is achieved by removing jumpers on the printed
circuit board (PCB) of the ACB for each of the “slave” ACBs [i.e. remove the jumpers on connector CN8 (CN14).].
The link between the ACB cards is made through a special DB-15 connector
located on the back of the ACB. A ribbon link cable connects to each of the
ACBs using this connector. The ribbon link cable is supplied in two
configurations; CBL-220 is used to connect two Card Cages together, while
the CBL-230 is used to connect three Card Cages together (these part numbers
are for ACB-100 cards). The figure on the right shows the link connection
between three Card Cages in the same rack.
One limitation of a back plane link is that only up to three card cages can be
linked in this fashion, and they must be adjacent to each other to comply with
the length requirements.
A back plane link has another limitation – if the “master” ACB in the link
fails, the “slave” ACBs will be unable to function. If the system specifications
require fail-safe operation, then a CEPT loop or redundant ACB cards (with a
redundant back plane link) should be used.
The MicroComm DXI I/O card cages can be linked together to form a larger
exchange. When card cages are mounted in the same equipment rack, the link connection is via the DB-15 ‘Link’
connector on the rear of the ACB card. To interconnect multiple card cages at remote locations to form an
exchange, CEPT ports on the ACB are used. CEPT trunks are available in fiber optic and copper cable versions.
4.2 CEPT Trunk Configuration
The network configuration of the CEPT trunk is that of a bi-directional loop, as indicated in the diagram below.
Each transmit and receive port of a CEPT pair is connected to the opposite ports of the next ACB in the loop i.e.
Tx1 of the first ACB is connected to Rx2 of the next ACB, while Tx2 of the second ACB is connected to Rx1 of the
first ACB. In the CEPT network show the ACB’s are connected so that the Primary loop is in the clockwise
direction, while the Secondary loop is in a counterclockwise direction. With this configuration if one link is
broken then data can still be transmitted from one ACB to any other ACB by switching to the Secondary loop.
CEPT Network
Status
AIB
400
Service
Service
Service
Service
Service
Service
Service
SAB
400
1
0
ACB
100
-12Vdc
+12Vdc
SAB
300
SAB
400
SAB
400
DIO
100
Status
Connect
Backup
Card
Reset
Master
Reset
Status
#3
#2
#3
#2
#2
#3
#3
#2
#3
#2
Status
Status
#1
#1
#1
Status
Status
#1
#1
Service Service
Service
Service
Service
Service
MicroComm DXI
PSU-310
Power Supply
TAB
400
TSB
400
AIO
400
AOB
400
RDB
100
PAB
400
Status
Card
Reset
Connect
#2
#2
#3
#2
Connect
Card
Reset
#3
#2
#2
#3
Status
Status
#1
#1
#1
Status
#1
Status
#1
#3
#2
#3
#2
#1
#1
Status
Status
AIB
400
Service
Service
Service
Service
Service
Service
Service
SAB
400
1
0
ACB
100
-12Vdc
+12Vdc
SAB
300
SAB
400
SAB
400
DIO
100
Status
Connect
Backup
Card
Reset
Master
Reset
Status
#3
#2
#3
#2
#2
#3
#3
#2
#3
#2
Status
Status
#1
#1
#1
Status
Status
#1
#1
Service Service
Service
Service
Service
Service
MicroComm DXI
PSU-310
Power Supply
TAB
400
TSB
400
AIO
400
AOB
400
RDB
100
PAB
400
Status
Card
Reset
Connect
#2
#2
#3
#2
Connect
Card
Reset
#3
#2
#2
#3
Status
Status
#1
#1
#1
Status
#1
Status
#1
#3
#2
#3
#2
#1
#1
Status
Status
AIB
400
Service
Service
Service
Service
Service
Service
Service
SAB
400
1
0
ACB
100
-12Vdc
+12Vdc
SAB
300
SAB
400
SAB
400
DIO
100
Status
Connect
Backup
Card
Reset
Master
Reset
Status
#3
#2
#3
#2
#2
#3
#3
#2
#3
#2
Status
Status
#1
#1
#1
Status
Status
#1
#1
Service Service
Service
Service
Service
Service
MicroComm DXI
PSU-310
Power Supply
TAB
400
TSB
400
AIO
400
AOB
400
RDB
100
PAB
400
Status
Card
Reset
Connect
#2
#2
#3
#2
Connect
Card
Reset
#3
#2
#2
#3
Status
Status
#1
#1
#1
Status
#1
Status
#1
#3
#2
#3
#2
#1
#1
Status
Slave
ACB
Master
ACB
Slave
ACB
Link
Cable
Tx1
Rx1
Rx2
Tx2
Secondary Loop
Primary Loop
Rx2
Tx1
Tx2
Rx1
Rx2
Tx1
Tx2
Rx1
ACB-100
ACB-100
ACB-100
