DXI MicroComm ACB-100 User manual

ACB-100 Audio Control Board
Document IM-ACB-100-2.5 © 1997 Harding Instruments - Printed in Canada
INSTALLATION MicroCommDXI
INSTRUCTIONS
1. Intent & Scope
This document describes the installation procedure for the ACB-100 Audio Control Board.
2. Description
The ACB-100 Audio Control Board controls all the I/O cards in a MicroComm DXI card cage. It controls the
system’s audio switching and includes the system’s digital signal processors. Audio trunking between card
cages, which may be linked to form larger exchanges, is also made through the ACB.
Each audio control board may include up to two Digital Signal Processors (DSP) expansion modules. Each
expansion module provides two more DSPs. These DSPs are used to support additional I/O cards and special
functions such as Audio Level Alarms and conference calls. Digital audio trunk (CEPT) interfaces are available
for fiber optic and copper conductor networks
An Audio Control Board (ACB-100) must be located in the first card slot of each card cage.
ACB-100

ACB-100 Audio Control Board
Page 2 Document IM-ACB-100-2.5
DSP Daughter Cards
Two versions of the printed circuit board used in the ACB-100 have been produced. The latest printed circuit
board is designated as PC06487-02, while the earlier version was designated as PC06487-01 or PC06487. The main
difference between the two boards is the location of the headers on the printed circuit board and the label names
assigned to the headers. In the following description the labels associated with the -01 version of the printed
circuit board are given in brackets.
The ACB-100 has one factory installed DSP, and headers for inserting two DSP daughter cards. Each daughter
card contains two DSPs. The factory installed DSP is labeled DSP #1. The daughter card inserted in header CN20
(CN1) contains DSPs labeled DSP #2 and DSP #3, while the daughter card inserted in header CN21 (CN2)
contains DSPs labeled DSP #4 and DSP #5. The following diagrams show the location and #1 pin of the headers
CN20 (CN1) and CN21 (CN2). If a daughter card is not installed in CN20 (CN1) and/or CN21 (CN2) headers
four shorting jumpers must be installed in positions 1-2, 3-4, 5-6 and 7-8 at the right hand end of the DSP
daughter card header.
Status
#1
#2
#3
Master
Reset
Card
Reset
Connect
Backup
Service
CEPT1
CEPT2
R
T
R
T
LINK
1
CN2
56
CN1
56
11
CN14
50
33
17
18
34
1
15
81
9
8
15
1
9
LINK
Audio/
CEPT
CEPT
Daughter
Card
DSP
Daughter
Card
DSP
Daughter
Card
ACB
100
PC-046487-01 PC-046487-01
Header Location for DSP Daughter Cards on PC06487-01

ACB-100 Audio Control Board
Document IM-ACB-100-2.5 Page 3
Status
#1
#2
#3
Master
Reset
Card
Reset
Connect
Backup
Service
CEPT1
CEPT2
R
T
R
T
LINK
1
CN21
56
CN20
56
1
1
CN8
50
33
17
18
34
1
15
81
9
8
15
1
9
LINK
Audio/
CEPT
CEPT
Daughter
Card
DSP
Daughter
Card
DSP
Daughter
Card
ACB
100
PC-046487-02PC-046487-02
Header Location for DSP Daughter Cards on PC06487-02
The card cage has 17 card slots. The ACB card is always installed in position 1, while the remaining 16 slots can
be used for any other type of DXI card. Determining card positions should be partially based on the intensity of
the workload placed on the DSP’s. The card cage slots are divided into five groups, as shown in the following
diagram:

ACB-100 Audio Control Board
Page 4 Document IM-ACB-100-2.5
1357911 13 15 17
246810 12 14 16
Slot
Position
C2-7
C8-10 C14-16
C17
C11-13
ACB
Card Cage Slot Positions
The groups are labeled as follows C2-7, C8-10, C11-13, C14-16, and C17. The notation C2-7, for example, represents
the group of cards in slot positions 2 to 7. The various DSP workloads are distributed according to the following
table:
Configuration C2-7 C8-10 C11-13 C14-16 C17
No daughter card DSP #1 DSP #1 DSP #1 DSP #1 DSP #1
Daughter card DSPs #2 & #3 DSP #1 DSP #2 DSP #2 DSP #3 DSP #3
Daughter card DSPs #4 & #5 DSP #1 DSP #1 DSP #4 DSP #1 DSP #5
Both Daughter Cards DSP #1 DSP #2 DSP #4 DSP #3 DSP #5
Note: If a system is set up for conference calls, then DSP #5 will be running the conference functions and cannot
perform normal operations. Therefore you should not install an audio card with switch inputs (SAB or AIO cards
for example) in card cage slot 17. Cards such as a PAB, TSB, or DIO cards can be inserted in card slot 17 since
these cards do not depend on the DSP for support.
Each DSP is capable of supporting 4 master stations. The slot position of the SAB cards in the card cage and the
assignment of SAB channels to master stations must be made so as to satisfy this constraint.
4. Card Cage Linking
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. CEPT trunks are available in fiber optic and cable versions.
4.1 Link Cable Interface
If there are two to three card cages in one equipment room, and they are mounted adjacent to each other in the
equipment racks (3 ft total from ACB to ACB), then the ACBs can be connected through a “back plane link” cable
for an inexpensive audio trunk link. One of these ACBs must act as the controlling ACB (the “master” ACB),

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
ServiceServiceServiceServiceServiceServiceService
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
StatusStatus
#1 #1 #1
Status Status
#1 #1
Service Service ServiceService ServiceService
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
StatusStatus
#1 #1 #1
Status
#1
Status
#1
#3
#2
#3
#2
#1 #1
Status
Status
AIB
400
ServiceServiceServiceServiceServiceServiceService
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
StatusStatus
#1 #1 #1
Status Status
#1 #1
Service Service ServiceService ServiceService
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
StatusStatus
#1 #1 #1
Status
#1
Status
#1
#3
#2
#3
#2
#1 #1
Status
Status
AIB
400
ServiceServiceServiceServiceServiceServiceService
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
StatusStatus
#1 #1 #1
Status Status
#1 #1
Service Service ServiceService ServiceService
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
StatusStatus
#1 #1 #1
Status
#1
Status
#1
#3
#2
#3
#2
#1 #1
Status
Slave
A
CB
Master
A
CB
Slave
A
CB
Link
Cable
Tx1
Rx1
Rx2
Tx2
Secondary Loop
Primary Loop
Rx2 Tx1
Tx2 Rx1
Rx2 Tx1
Tx2 Rx1
ACB-100 ACB-100 ACB-100

ACB-100 Audio Control Board
Page 6 Document IM-ACB-100-2.5
4.3 Copper CEPT Network Interface
For the copper conductor interface version of the CEPT trunk a CBL-110-A cable connects to the female DB-50
connector on the rear of the ACB card. The CBL-110 cable has three individual multi-conductor cables; (i) four (4)
shielded twisted pair, (ii) six (6) unshielded twisted pairs, and (iii) four (4) unshielded twisted pairs with a cable
shield. Only one of the cables (four unshielded twisted pair with cable shield) is used with the ACB card. The pin
outs for a mating male connector on a CBL-110 cable is shown in the following wiring table. Only the Tx and Rx
CEPT connections are used for this application. Signals indicated are from the board’s perspective.
The maximum distance between ACB cards for a 22 gauge (unshielded) twisted pair is 8,200 ft (2.5 km).
4.4 Fiber Optic CEPT Network Interface
The fiber optic CEPT interface version of the audio control board is provided with four ST type fiber optic
connectors. These are marked for each of CEPT 1 and CEPT 2 as Tx (Transmit) and Rx (Receive) from the board’s
perspective.
The maximum signal strength power loss in a fiber optics CEPT link must not exceed 12 db. The length of cable,
number of connectors, and number of patch panels determines the loss of signal strength in fiber optic cables.
With only one pair of connectors between ACB cards for a 62.5/125 multimode fiber optic cable the maximum
distance between ACBs is 8,500 ft (2.6 km).
Typically, every connector reduces the signal by 0.3 db, and every 3,300 ft (1 km) of cable reduces the signal by
3.2 db, assuming a perfect connection. You should allow for some extra margin for field-grade connections.

ACB-100 Audio Control Board
Document IM-ACB-100-2.5 Page 7
Wiring Table
DB-50
Pin Number Signal Name Wire Color Cable 1 Wire Color Cable 2 Wire Color Cable 3 Terminal Block Pin Number
1 Audio 1 + Black 1
18 Audio 1 - Red 2
34 Audio 1 Shield BR Shield 3
2 Input 1 White-Blue 4
19 Common 1 Blue-White 5
35 Output 1 White-Orange 6
3 Audio 2 + Black 7
20 Audio 2 - White 8
36 Audio 2 Shield BW Shield 9
4 Input 2 Orange-White 10
21 Common 2 White-Green 11
37 Output 2 Green-White 12
5 Audio 3 + Black 13
22 Audio 3 - Green 14
38 Audio 3 Shield BG Shield 15
6 Input 3 White-Brown 16
23 Common 3 Brown-White 17
39 Output 3 White-Grey 18
7 Audio 4 + Black 19
24 Audio 4 - Blue 20
40 Audio 4 Shield BBl Shield 21
8 Input 4 Grey-White 22
25 Common 4 Red-Blue 23
41 Output 4 Blue-Red 24
9 N/C 25
26 N/C 26
42 N/C 27
10 N/C 28
27 N/C 29
43 N/C 30
11 N/C 31
28 N/C 32
44 N/C 33
12 N/C 34
29 N/C 35
45 N/C 36
13 N/C 37
30 N/C 38
46 N/C 39
14 N/C 40
31 N/C 41
47 Rx 2 + White-Blue 42
15 Rx 2 - Blue 43
32 Tx 2 - White-Orange 44
48 Tx 2 + Orange 45
16 Gnd Cable Shield 46
33 Rx 1 + White-Green 47
49 Rx 1 - Green 48
17 Tx 1 - Brown 49
50 Tx 1+ White-Brown 50

ACB-100 Audio Control Board
Page 8 Document IM-ACB-100-2.5
5. System Planning Worksheet
The table on the following page may be copied and used as a worksheet for planning system wiring. It shows the
audio control board’s pin numbers, pin signal name, associated CBL-110 cable wire colors, and terminal block
terminal numbers. The blank column is to be used to identify the field wiring interface connection.

ACB-100 Audio Control Board
Document IM-ACB-100-2.5 Page 9
Card Cage: _________________________ Card Slot: _____________________
DB-50
Pin Number Signal Name Wire Color Cable 1 Wire Color Cable 2 Wire Color Cable 3 Terminal Block Pin Number Connect To
1 Audio 1 + Black 1
18 Audio 1 - Red 2
34 Audio 1 Shield BR Shield 3
2 Input 1 White-Blue 4
19 Common 1 Blue-White 5
35 Output 1 White-Orange 6
3 Audio 2 + Black 7
20 Audio 2 - White 8
36 Audio 2 Shield BW Shield 9
4 Input 2 Orange-White 10
21 Common 2 White-Green 11
37 Output 2 Green-White 12
5 Audio 3 + Black 13
22 Audio 3 - Green 14
38 Audio 3 Shield BG Shield 15
6 Input 3 White-Brown 16
23 Common 3 Brown-White 17
39 Output 3 White-Grey 18
7 Audio 4 + Black 19
24 Audio 4 - Blue 20
40 Audio 4 Shield BBl Shield 21
8 Input 4 Grey-White 22
25 Common 4 Red-Blue 23
41 Output 4 Blue-Red 24
9 N/C 25
26 N/C 26
42 N/C 27
10 N/C 28
27 N/C 29
43 N/C 30
11 N/C 31
28 N/C 32
44 N/C 33
12 N/C 34
29 N/C 35
45 N/C 36
13 N/C 37
30 N/C 38
46 N/C 39
14 N/C 40
31 N/C 41
47 Rx 2 + White-Blue 42
15 Rx 2 - Blue 43
32 Tx 2 - White-Orange 44
48 Tx 2 + Orange 45
16 Gnd Cable Shield 46
33 Rx 1 + White-Green 47
49 Rx 1 - Green 48
17 Tx 1 - Brown 49
50 Tx 1+ White-Brown 50