Ringmaster CB901EX User manual

CB901EX
OPERATIONS MANUAL
CRISIS ALERT
Ring-Master

CB900EX Operations Manual
Table of Contents
INTRODUCTION.........................................................................................................................5
FEATURES.................................................................................................................................
STANDARD FEATURES........................................................................................................
SYSTEM FEATURES.............................................................................................................
INDIVIDUAL FEATURES.......................................................................................................
NUMBER PLAN......................................................................................................................8
FEATURE DESCRIPTION..........................................................................................................9
HANDSET / LOUDSPEAKING...............................................................................................9
CONFIDENTIAL /SOFTSPEAKING.......................................................................................9
SIMPLEX.................................................................................................................................9
MICROPHONE CUTOFF.......................................................................................................9
DIRECT DIALING...................................................................................................................9
DIRECT ACCESS...................................................................................................................9
ALARM..................................................................................................................................10
LINE SUPERVISION............................................................................................................10
TWO BUTTON DC SHIFT SUB-STATION...........................................................................10
REMOTE CONTROL............................................................................................................10
CAMP ON BUSY EXTENSION............................................................................................10
PRIVACY..............................................................................................................................10
PRIORITY.............................................................................................................................11
PERSONAL QUEUE.............................................................................................................11
TRANSFER...........................................................................................................................11
PAGING................................................................................................................................12
PRIVILEGES FOR PAGING GROUPS................................................................................12
PROGRAM DISTRIBUTION.................................................................................................14
TWO WAY RADIO................................................................................................................14
TELEPHONE NETWORK.....................................................................................................15
INSTALLATION ........................................................................................................................16
INSTALLATION PLANNING.................................................................................................16
CENTRAL LOCATION..........................................................................................................16
CABLE REQUIREMENTS................................................................................................1
INSTALLATION OF CENTRAL EXCHANGE...................................................................18
MOUNTING THE CARD RACK BACKPLATE.................................................................18
CABLE TERMINATION IN STATION SOCKET...............................................................19
CABLE TERMINATION IN CENTRAL CARDRACK........................................................19
INSTALLATION OF CARDRACK.....................................................................................20
POWER UNIT SPECS, CENTRAL AND STATION POWER..........................................20
PLUGGING IN PRINTED CIRCUITS CARDS.................................................................22
INSTALLATION OF PROGRAM DISTRIBUTION CARD................................................22
POWER ON SYSTEM CHECK........................................................................................25
ADJUSTMENTS...............................................................................................................26
FINAL CHECK OUT OF THE SYSTEM....................................................................................2
INTRODUCTION..............................................................................................................2
FINAL CHECK AND COMMISSIONING..........................................................................2

SERVICE INFORMATION......................................................................................28
CONVERSION TABLE STATION POSITION/CALL NUMBER..................................29
TECHNICAL SPECIFICATIONS.....................................................................................3
CONFIGURATION...........................................................................................................58
SYNTAX......................................................................................................................58
HELP...........................................................................................................................59
LINE EQUIPMENT......................................................................................................61
CALL NUMBER...........................................................................................................61
CALLER ID..............................................................................................................62
DEVICE TYPE.........................................................................................................63
PRIVELEGE TYPE..................................................................................................64
DIRECT DIAL..........................................................................................................66
SUBSCRIBER TIMERS..........................................................................................6
TRANSFER.............................................................................................................68
ANNUNCIATOR DISPLAY......................................................................................69
EVENT LOG PRINTER........................................................................................... 0
CAMERA SWITCHER............................................................................................. 0
BATTERY CHARGE MONITOR................................................................................. 1
ALL CALL.................................................................................................................... 2
GROUP CALL.............................................................................................................. 3
GROUP CONFERENCE............................................................................................. 4
SECTORING............................................................................................................... 5
INSTALLATION............................................................................................................... 9
SWITCH PROGRAMMING.........................................................................................80
RESET BATTERY RAM..............................................................................................80

July 2018 Operations Manual CB901EX
INTRODUCTION
Ring-Master system CB 901EX is an all-to-all direct speech system, controlled by a fully
electronic central e change. All its functions are microprocessor controlled. This enables the customer
to select from a wide range of programmable features designed to achieve fle ibility and optimal
efficiency in internal communication.
A built-in Lithium battery will secure all programmed information up to 10 years when power
to system is switched off.
The modular structure of the central permits easy e pansion, station by station, from 2 up to a
capacity of 7.000 subscribers. Moreover, a wide variety of station types, matching the needs of almost
any user, whether institutional, industrial or commercial applications, increases the fle ibility of the
system.
The unique cabling concept provides the advantages of both centralized and decentralized
cabling arrangements. Each station requires one single pair for dialing and conversation. Power can
either be individual to each station or remote groups of stations can be supplied from local mains
power units. The cabling is ordinary telephone wires.
The central unit is compact. A standard basic cardrack equipped for 80 subscribers measures
only 256 mm 570 mm 271 mm (10.1" 22.4" 10.9"). Silent in operation, once fitted with its
cover, the central can operate inconspicuously in almost any location.
In a single-Stage system, the central unit consists of a Basic Cardrack DP 979 containing the
Basic Cardset and Subscriber Cards, totaling 88 subscribers. If the number requirements e ceed this, an
additional Subscriber Cardrack DP 980 is necessary, giving a ma imum capacity of 240 subscribers in
a single-stage system.
Each single-stage of 240 numbers is equipped with 15 internal links.
The number of subscribers in a CB 901EX system may be e panded in steps of 8, plugging in
subscriber cards.
The basic cardrack 10 subscriber cards = 80 subscribers
The subscriber cardrack 20 subscriber cards = 160 subscribers
Giving a ma imum capacity of 240 subscribers, each with access to the 15 links.
Each stage in the central unit consists of a basic cardrack for the common basic cardset, and
according to the number capacity, an additional subscriber cardrack.
All cards in a CB 901EX system are of plug-in type, interconnected via the motherboard in each
cardrack.
The CB901EX printed circuit cards, are briefly described in the following:
Page 5 of 83
Ring-Master

CB901EX Operations Manual July 2018
PROCESSOR CARD
This card contains the microprocessor, its program and memory.
The 256K bytes program, which controls all computer operations is located in FLASH Memory).
It contains the main oscillator (10.7 MHz) and provides all timing signals in the central unit. In this
way the system is synchronized all the way through, which minimizes noise generation on the audio
links. This card also sets up/disconnects links, directed by the processor. It handles the PAM (Pulse
Amplitude Modulation) sampling control for all links. There are 32 time-slots in the system. One time-
slot is allocated by the subscriber scanner and one for the tone receiver, leaving 30 time-slots for audio
connections. This means that there is room for 15 simultaneous audio links.
AUDIO CONTROL CARD
The duple voice control circuits are located on this card, together with the receiver and tone
transmitter. The processor fully controls the tone receiver/transmitter.
The duple control circuit operates individually for each time-slot, which is much faster than the
processor can manage. Therefore, a separate control system is included on this card.
LINK CARD (2 cards)
It connects the audio signals between the subscribers. Each card handles 8 links and there are
always 2 link cards in the central unit.
POWER CARD
It contains a switching power supply, synchronized with the main oscillator to minimize noise.
Input to the card is 25 - 28V DC.
PROGRAM DISTRIBUTION CARD
It interfaces the intercom system to an e ternal program source and allows the subscribers to
activate and connect program- (music) and alarm channels.
SUBSCRIBER CARD
It terminates the lines for 8 subscribers, and is the interface card between the stations and the central unit.
The card splits up the audio/signaling information to/from the subscribers. All subscriber cards are identical.
Page 6 of 83
Ring-Master

July 2018 Operations Manual CB901EX
FEATURES
STANDARD FEATURES
15 Links
Hands free Loudspeaking
Confidential Softspeaking
T-Button for manual control of speech direction
Microphone mute
Data transmission for remote control
Privacy
Camp on busy e tension
Crisis Alert Network Interface
SYSTEM FEATURES
2 ,3 or 4 Digit call numbers
Program distribution (7 Channels)
All Call (70)
7 Group Calls (71-77)
Assignable Group call numbers
Meet me (8-90)
Group Conference
Battery Charger Alarm
Event log printer interface (DNA100 required)
Video switcher interface (DNA200 required)
Computer Interface (DNA300 required)
Pocket Page Interface (DNA400 required)
INDIVIDUAL FEATURES
Direct access
10 Direct dial
Simple always
Assignable call numbers
12 Alphanumeric caller ID
Personal queue for incoming calls
Telephone Dialer (IF934P, DNA934P or DNA934T)
E ternal display of the personal queue (DAD104, DS16,DNA300, DNA301)
7 Transfer numbers for each subscriber (with programmable delay)
Priority
Line Supervision
Silent Ring for receiver with Annunciator
Page of 83
Ring-Master

CB901EX Operations Manual July 2018
NUMBER PLAN
IDLE:
10-69 Subscriber number 2 digit dial
100-699 Subscriber number 3 digit dial
1000-6999 Subscriber number 4 digit dial
70 All Call
71-79 Group Calls
90 Respond to meet-me
98 Program distribution
PRIVACY:
0 Accept call
CONVERSATION (INITIATOR):
X Cancel call
8 Activate meet-me from Group Call or All Call
CONVERSATION (RECEIVER):
X Cancel call
Page 8 of 83
Ring-Master

July 2018 Operations Manual CB901EX
FEATURE DESCRIPTION
HANDSET / LOUDSPEAKING
When two intercom stations are connected, either party may speak to the other hands free without
touching any buttons.
CONFIDENTIAL /SOFTSPEAKING
At any time during the call, either one or both parties may pick up their station ( AA918) and
use it as a handset for a confidential conversation. When both parties are in handset mode,
the system operates in open duplex mode and both parties may talk and listen at the same
time.
SIMPLEX
The T-button may be used to control the speech direction (push to talk release to listen). This is
useful when one of the intercom stations is in a noisy area. Either party may use this function. If both
stations are pushing the T-button the control is given to the station that pushed T last. Either party may
revert to handsfree mode by tapping the T-button. Any call number may be programmed with the
privilege “simple always” . When a call is placed from or to a station with the “simple always”
privilege, the initiator will be in listen mode and the T-button must be used to change the speech
direction.
MICROPHONE CUTOFF
To temporarily mute the microphone during conversation, the mute button may be pressed down.
DIRECT DIALING
It is possible to program keys 0 to 9 of each intercom station’s keypad to speed dial frequently
called numbers. When a programmed key is pressed, a dialtone is heard as normal. If a second key is
pressed within 1.2 seconds (programmable subscriber timer) then a normal dial sequence is taken.
DIRECT ACCESS
It is possible to program one call number for each intercom station to be activated by short DC-
shift (<1 sec). This type of calling is used with door stations and elevator stations that do not have a
tone dialer.
Page 9 of 83
Ring-Master

CB901EX Operations Manual July 2018
ALARM
Long DC shift (1sec<) will send ALARM to the call number programmed for direct access.
LINE SUPERVISION
Line Supervision is activated with privilege #10. Zero Volt on the audio line will send FAULT
to the call number programmed for Direct Access.
TWO BUTTON DC SHIFT SUB-STATION
Direct Access and Direct Dial #1 are programmed to activate this feature.
Short DC shift(<1sec) will send CALL to the call number for Direct Dial #1.
Long DC shift (1sec>) will send ALARM to to the call number programmed for Direct Access.
Zero Volt on the audio line will send FAULT to the call number programmed for Direct
Access.
Device Type = sub
Program in Que = none
REMOTE CONTROL
DTMF tones may be sent from one intercom station to the other for remote control. The keypad on
the station sends standard telephone dialing tones (CCITT). This is mainly used for electric door-lock
release and for dialling out to the public telephone network (PTT). The microphone mute function must
be activated while pushing a number key to disable conference add-on . When the B-subscriber
(receiver of the call) is programmed with the privilege “DTMF Device” then the number keys may be
activated without pushing the microphone mute key.
CAMP ON BUSY EXTENSION
The caller may camp-on to a busy e tension for 20 seconds (programmable subscriber timer),
after which the call will be automatically cancelled. If the called party becomes free within this time,
the connection will be established with warning tone to both parties.
PRIVACY
The stations privacy switch controls the privacy status. When the B-subscriber is in privacy both
stations get the ringing tone. The B-subscriber may accept the call by pressing the 0-button within 15
seconds (programmable subscriber timer). This operation is valid when the B-subscriber is not using
personal queue.
Page 10 of 83
Ring-Master

July 2018 Operations Manual CB901EX
PRIORITY
When a station is programmed with the privelege “Priority” it may connect to a busy or privacy
station by dialing “0” . This is only possible if the busy station does not have Priority privelege.
PERSONAL QUEUE
Each intercom station has a Personal Queue. This queue is activated with privilege “Personal
Queue”. All received calls are then put in the personal que and the intercom station will ring (2 second
on, 3 second off) until the call is answered by pressing the 0-key. When the call is cancelled (X) the
ne t call in queue starts ringing after 2 seconds (programmable subscriber timer). With the privilege
“Automatic Answer” the call is automatically connected without pushing the 0-key.
Calls are inserted to the personal queue on a first in first out within each priority level (1-9). The
priority level is the Call Priority of the calling station (level 1 is highest priority). The calling station
may be connected to Ringing Tone, Program Channel or silence when in que. The personal queue may
be displayed and answered on a DAD104.
TRANSFER
Call Transfer is used to distribute incoming calls to additional intercom station. Call transfer is
using the personal que. Each subscriber may be programmed with 7 transfer numbers with delays.
When a call is place to the intercom station with “personal queue” the call will be inserted in the
personal que of the called station. When the transfer 1 delay e pires the call will be placed in the
personal que of the transfer 1 intercom station. The transfer 2 delay is then activated and when it
e pires the call is inserted in the personal que of the transfer 2 intercom station. This sequence is then
repeated for transfers 3-7 if programmed. The incoming call is now in the personal queue of multiple
intercom stations and when one of them answers the call it is removed from all the personal queues.
The transfer delay is 0 - 9 minutes or infinite. If a transfer station is in privacy then the delay to that
station is set to 0 and the call will transfer instantly (used for night transfer). Personal Queue is always
used when calls transfer to another intercom station independent of the “personal queue” privilege.
Page 11 of 83
Ring-Master

CB901EX Operations Manual July 2018
PAGING
Allows for one way paging from one station to other stations in the e change and will override
calls in progress (they will reconnect when the Page is completed).There are 15 paging groups in
thesystem. Each group contains the call numbers that are included in the page (group call) or e cluded
from the page (all call). The type of group is determined by the group privilege A. If a group has the A
privilege it is an all call group, if not then it is a group call group. The intercom dialing the paging
group must have the proper privilege (all call access and/or group call access). The paging is
terminated by dialing X or 8 (meet me). One of the stations can then dial 90 to call back to the Paging
initiator. The call back is active until one station dials 90 or a new call back is activated from another
All Call or Group Call. The duration of the page is limited to 60 seconds (programmable subscriber
timers). Only one Group Call can be active at a time. Stations calling Group Page when it is in use may
camp on until it is free.
Default:
Access numbers are 0- 9 for groups 0-9.
Group 0 is all call
Groups 1-15 are group calls
PRIVILEGES FOR PAGING GROUPS
A privilege = All Call group.
T privilege = Talk button must be pushed to activate microphone.
G privilege = Global group e tends paging to other e changes.
C privilege = Group conference
PROGRAMMING
The following commands are used for this feature.
SGCM Set Group Call Members
LGCM List Group Call Members
SGCP Set Group Call Privilege
SGCN Set Group Call Number
E ample 1: E clude stations 10 and 11 from All Call #0 (70).
>SGCMcr
Call Number <10-99/*> : 10-11cr
Group Number <0..7> : 0cr
<+/-/=> : +cr
>
Page 12 of 83
Ring-Master

July 2018 Operations Manual CB901EX
Example 2: Include stations 12-26 in Group Call #3 ( 3).
>SGCMcr
Call Number <10-99/*> : 12-26cr
Group Number <0..7> : 3cr
<+/-/=> : +cr
>
Example 3: Exclude stations 15 from Group Call #3 ( 3).
>SGCMcr
Call Number <10-99/*> : 15cr
Group Number <0..7> : 3cr
<+/-/=> : -cr
>
E ample 4: Include stations 18 only in Group Call #6 (76) .
>SGCMcrr
Call Number <10-99/*> : 18cr
Group Number <0..7> : 6cr
<+/-/=> : =cr
>
E ample 5: Group Conference for stations 10-16 in Group Call #1 (71) .
>SGCMcrr
Call Number <10-99/*> : 10-16cr
Group Number <0..7> : 1cr
<+/-/=> : =cr
>SGCPcrr
Group Number <0..7> : 1cr
Group Privilege (0=Allcall 1=Global 2=T 3=Conference) <0..3> : 3cr
<+/-/=> : +cr
>SGCPcrr
Group Number <0..7> : 1cr
Group Privilege (0=Allcall 1=Global 2=T 3=Conference) <0..3> : 2cr
<+/-/=> : +cr
Display the result of example 1 - 5.
Page 13 of 83
Ring-Master

CB901EX Operations Manual July 2018
>LGCMcr
Group Call
Number Number Receivers
====== ====== =================================================
0 A 70 10 11
1 TC 71
2 72
3 G 73 12 13 14 16 17 19 20 21 22 23
24 25 26
4 74
5 75
6 76 18
7 77
8 78
9 79
10
11
12
13
14
15
>
SECTORING
16 sectors are available for restricting calls.
Each intercom is a member of one sector (default is sector 0).
Each sector can be programmed to allow calls to other sectors.
Default: intercoms that are members of a sector can only call intercoms in the same sector.
PROGRAM DISTRIBUTION
The system has seven program channels for distribution of music or other program sources.
The access code is 98 followed by channel number then volume number. The connection to program
distribution does not effect normal intercom operations. When a call is initiated or received, the music
is put on hold until the call is completed and then it is automatically reconnected.
TWO WAY RADIO
The CB901EX system may be connected to a radio base station for communication on a closed
two-way radio network. An interface unit (IF935) is required and is given an ordinary subscriber
number. If the radio system is simple PTT then the subscriber number should be programmed with
privilege “Simple Always” The radio receive signal may be connected to the program distribution
channel for monitoring.
Page 14 of 83
Ring-Master

July 2018 Operations Manual CB901EX
TELEPHONE NETWORK
An interface (IF934P) can be supplied to operate between a telephone network and the CB901EX.
The interface is used to make calls from any intercom station to the telephone network and to make a
call from an outside telephone to any intercom station.
The interface may be used as a speed dialer to a telephone number used for answering intercom calls
from elevator intercoms in a night transfer mode of operation. The device type of the interface is set to
PBX, and the speed dial number is programmed from the DNA100. A delay may be entered as P1 for
one second delay to P9 for 9 second delay. E ample: P29P31234567 will delay 2 seconds (waiting for
dial tone), dial 9, delay 3 seconds, then dial 1234567. When a call enters the personal que of the
interface it will speed dial the remote telephone number, connect the station in que to the telephone line
and then wait for disconnect from the remote telephone before releasing the connection between the
interface and the intercom station. After 2 seconds (programmable subscriber timer) the ne t call in
personal que will repeat the process.
If the interface does not have the privilege “Personal Queue” then calls made to the interface will not
activate the dialer and the phone number must be manually dialed. If transfers are activated from other
stations (lobby master) , then theses calls are automatically placed in the personal que of the interface
and will use the speed dialer out on the telephone line. This way a motor room master may use the
interface for manually dialed calls, while elevator intercoms that dial the lobby master will be
transferred to the personal que of the interface and use the speed dialer. The lobby master may have an
infinite transfer delay during the day when all calls are answered by the lobby master. At night the
lobby master is placed in privacy and all calls are transferred to the telephone interface.
DRECT ACCESS MASTER
This master station will connect to the intercom stations programmed in the Direct Acces when
a contact closure activates Initiative. When the contact closure is removed the station will cancel.
Page 15 of 83
Ring-Master

CB901EX Operations Manual July 2018
INSTALLATION
INSTALLATION PLANNING
Proper planning minimizes the time required and costs incurred during an installation. In the long
term, maintenance, changes and e pansion can be accomplished efficiently when planned for prior to
the initial installation. This results in customer satisfaction and goodwill through a minimum disruption
of their business activities. Ultimately, customer satisfaction results in additional sales.
Each customer’s facility is different and requires a tailored approach to ensure that the job runs
smoothly. Each facility will have its own combination of circumstances which must be addressed.
Table below summarizes the major stages of a typical intercom installation. The sequence in which the
stages are accomplished, or the work accomplished in each stage itself, can be modified to reflect the
particular circumstances of each installation. However, the general approach should include the
installation stages listed below:
STEP INSTALLATION
1. Site survey and data collection.
2. Plan major equipment layout. (Central, system power supply, and
position of the various stations, speakers, etc.)
3. Plan cable routing.
4. Preparation and preassembly of central and power supply at shop facility.
5. Site work:
a. Running of station cables
b. Equipment mounting (central, power supply, etc.)
c. Station and speaker installation
d. System programming and adjustment
6. System checkout and commissioning
7. Customer introduction and training.
8.
CENTRAL LOCATION
A summary of the environmental factors affecting the Ring-Master CB901 system is presented in
the listing below. These factors must be considered when developing a detailed system plan.
Site preparation is dependent upon the customer’s facilities. In many cases, there may be only one
location where the central and power supply (or transformer) can be mounted. However, when several
locations are possible, the advantages and disadvantages of each location should be considered.
Consider each of the following factors:
A. The central and power supply must be wall mounted.
B. Location of the majority of stations, locate the central strategically, so that you can
minimize the length of cable runs.
Page 16 of 83
Ring-Master

July 2018 Operations Manual CB901EX
C. Location of e isting telephone ducts or conduit.
D. The AC line should be dedicated e clusively to the system. If the line is equipped
with a circuit breaker at the service entrance panel, the circuit breaker switch should be labeled
«DO NOT TURN OFF».
E. The equipment should be installed in an area that has adequate ventilation. A
temperature range of 0oC (32oF) to 25oC ( oF) and humidity range of 30% to 90%
relative must be maintained.
F. Appropriate lighting conditions and adequate working space should be provided for
future service calls.
G. Consideration must be given to those conditions that may cause damage to the
equipment. For e ample, dust or vapor from flammable or corrosive solvent may
cause damage. The installation site should not be located in an area likely to be flooded
or likely to be damaged by moving objects nearby.
H. The central should NOT be installed in an area near electrical noise including
equipment, i.e., heavy motors, welders, dimmers, radio transmitters etc.
I. The power supply (or transformer) must not be mounted below the central. This is to
prevent overheating the central.
CABLE REQUIREMENTS
Each station is connected to the central by 4 leads (in two twisted pairs).
Leads No. 1 and No. 2. Audio and signaling.
Individual leads i.e., a separate twisted pair is required for each station. This pair carries
tone-signaling (CCITT norm.) for dialing, audio transmission and DC control signals for stations.
The ma imum loop-resistance of this pair is 240 ohm corresponding to appro . 2km cable-length
from station to central, using normal telephone cabling with 0.6 mm diam. wiring. If the actual distance
is more than 2 km. (loop resistance more than 240 ohm) doubling this audio pair (or using heavier
cable) can cause incorrect dialing transmission, since the capacitance in the cable is also increased.
Doubling is not recommended. If cable to a station passes close to radio aerials or other interference
sources, the leads to the actual station should be shielded.
Leads No. 3 and No. 4. Station O erating Voltage.
These leads carry operating voltage to the stations. The ma imum/ minimum station voltage for
proper operation is 21 - 28.5 V. This allows a loop resistance between each station and power supply
(centralized or local) of 40 ohm, giving a distance of 350 meters on 0.6 mm copper wire and 600 m on
0.8 mm. (based on power supply output of 27V DC).
Page 1 of 83
Ring-Master

CB901EX Operations Manual July 2018
The wire dimensions for stations located further from the central must be increased accordingly.
However, independent local DC power supplies can be used for distant stations. No reference wiring
between local and central power supplies is required.
Im ortant Note: If a number of stations are powered from a common/parallel DC power pair,
voltage fluctuations can result in incidental crosstalk. Therefore it is essential that a separate power pair
is always used for each station.
INSTALLATION OF CENTRAL EXCHANGE
Each basic cardrack and subscriber cardrack consists of two main parts: a metal backplate and a
front cardrack (which secures to the backplate with 2 screws) that swivels outward, giving access
behind the motherboard during maintenance.
Check for signs of physical damage when unpacking the central. In particular check the long
contact-pins on the rear of the motherboards PCB979, PCB980 for possible distortion that may cause
short-circuiting.
OUNTING THE CARD RACK BACKPLATE
Four holes in the backplate are provided for mounting on a wall or 19" rack. The position of the
cardracks should allow for easy access of incoming station cables.
Mount the backplate, as follows:
a. Drill holes corresponding to the backplate in the wall.
b. Mount the backplate (see note).
NOTE: The four screws required for wall mounting the central unit are not provided. Be certain
that the screws used can support the central unit.
When using two cardracks for a central unit, two 20-pair flat cables (NMF6002) are supplied with
DP 980 Cardrack to connect the two units together. The cables have a fi ed length, thus limiting the
distance between the cardracks to appro imately 10-12 cm (4-4,5 inches). (See Fig. 1.6, 1.7). The top
pin of Cable no. 1 in each pin row will not be connected.
The backplate is now ready for station wiring.
Page 18 of 83
Ring-Master

July 2018 Operations Manual CB901EX
CABLE TER INATION IN STATION SOCKET
Station type: Master Stations AA918, AA917 w/display - modular 8 pin RJ45 socket.
Leads No. 1 and No. 2 - Audio Signaling Leads
Lead No. 1 to be connected to pin No. 5 in the RJ45 station socket.
Lead No. 2 to be connected to pin No. 4 in the RJ45 station socket.
Leads No. 3 and No. 4 - Station Operation Voltage.
Lead No. 3 is positive and must be connected to pin No 3 in the RJ45 socket.
Lead No. 4 is negative and must be connected to pin No. 6 in the RJ45 socket.
Station type: All station types (Sub- and Master) using Hirschmann 6 pin socket
Leads No. 1 and No. 2 - Audio Signalling Leads
Lead No. 1 to be connected to pin No. 1 in the Hirschmann socket.
Lead No. 2 to be connected to pin No. 2 in the Hirschmann socket.
Leads No. 3 and No. 4 - Station Operation Voltage.
Lead No. 3 is positive and must be connected to pin No 3 in the socket.
Lead No. 4 is negative and must be connected to pin No. 4 in the socket.
NOTE: Always use a separate power pair for each station to the DC power source, to avoid
crosstalk.
CABLE TER INATION IN CENTRAL CARDRACK
Connection of stations wires.
Each subscriber card (DP978) can connect 8 intercom stations. A flat cable connects each
subscriber card to the BF901(PCB933) on the back plate (MA901) of the DP979/DP980. The BF901
can connect 3 subscriber cards (24 intercom stations). Two 25 pair cables (CBL25P/20) connect each
BF901 to the Main Distribution Frame (MDF). 12 intercoms stations (audio+power) on each cable.
The CBL25P/20 cable is 20 feet long with connectors at both ends. The cable can be cut in half to
provide two 10 foot cables for the BF901. The connectors plug in to the BF901 and the other end of the
cable (24AWG solid) punch down to the MDF . The MDF may be Krone, S110, 66 blocs or similar.
The intercom position in the central have he adecimal numbering.
See Fig. 1.9. for terminal layout.
See Fig. 1.10. for conversion from he adecimal position number to decimal call number.
This basic cardrack can be reduced providing only 88 or 80 subscribers, but positions 12 and 13
have parallel card positions 21-22 in subscriber cardrack. Subscribers must either be connected in
position 12/13 or 21/22. The subscriber cardrack will then consist of 160 subscribers (20 subscriber
cards). See Figure 1.10.
Page 19 of 83
Ring-Master

CB901EX Operations Manual July 2018
Connection of 24V ower .
24 Volt is connected to the DP979 motherboard (PCB979) and to the power distribution board
(PCB935) in DP979/DP980. See figure 1.12.
Four self-healing fuses with red fail LEDs are used on each BF901 (6 stations on each fuse). The
red LED is lit when a short is detected in the power. The LED on the power distribution board is
normally green but turns red when any of the fuses on the BF901 detects a short. Only when the LED is
green is the Power Fail Relay activated. Contacts form C is available at terminal CN3.
INSTALLATION OF CARDRACK
When cable connections are completed, mount the rack to the backplate with the 2 pins. Two
magnets are fi ed to the rear of the rack to hold it in closed position. Swivel the rack open to permit the
flat cables to be plugged into their relative pin-row positions on the rear of the motherboard. Take care
when folding the flat cable i.e., that they remain clear of motherboard pins when the central is closed.
POWER UNIT SPECS, CENTRAL AND STATION POWER
Although Ring-Master systems normally function on 24 VDC, power units shall be adjusted to 27
VDC which is the correct charging voltage when systems are connected to batteries for group/ all-call
or no-break battery back-up. Using 27 V also permits longer cabling from stations to central with a 3 V
tolerance to 24 V control voltage drop on longer cable runs. Ring-Master supplies a standard DC
power unit PSDC24V12A which is factory-adjusted to 27 V and can supply 12 Amp. It is adjustable .
A smaller power unit PSDC27V5A is also available for local use with remote stations, giving 5 Amp
DC, i.e., adequate for ma . 20 stations. Power units can also be purchased locally provided that they
meet the specifications for supplying Ring-Master systems,- e.g., regulated, and with a ma .
ripple/noise level of 30 mV peak to peak.
Note. The power unit should be equipped with over voltage protection.
Page 20 of 83
Ring-Master