BusinessPhone Communication Platform 4.0
System Description ASB 150 02

## Hardware

### Central unit

#### Cabinets

##### Cabinet BDV 113 08

The cabinet contains a back plane board (PUB6) with slots for 9 boards (control unit/device boards) and can be powered by a transformer or AC/DC switched mode power supply with battery charger unit (optional) mounted on the rear side of the cabinet or an external DC supply. A maximum of 3 cabinets can be interconnected to form a system with 27 boards.

##### Cabinet BDV BS 101 01

The cabinet contains a backplane board with slots for 5 boards (control unit/ device boards). This cabinet is used up to ASB 150 02 R11. The cabinet (PBX) is powered by an internally situated power supply unit. The cabinet has room for batteries, if battery backup functionality is required. This cabinet cannot be interconnected to other cabinets. A small MDF is provided in the cabinet.

##### Cabinet BDV BS 101 05

The cabinet is a stand alone unit for up to 5 boards (control unit/ device boards). This cabinet is used from and including ASB 150 02 R11. The cabinet (PBX) is powered by an internally situated power supply unit with the possibility to connect an external battery pack.

#### PUB5 (ROA 119 5130)

Back plane with DC/DC voltage converter:

- DC/DC converter:

- Input: 36 VAC or 48 VDC
- Output: ±12 and +5 VDC

- Slots for connection of 9 device boards
- System busses:

- Clock bus: Clocks and synchronisation
- FC-bus: Control of board connection
- SC-bus: Inter-board communications
- PCM-bus: For voice (speech) connection
- VT-bus, VR-bus: transmit and receive bus for voice connection in the Integrated Cordless system

- Connection of ribbon cable to interconnect a maximum of three cabinets

#### PUB6 (ROA 119 5132)

Back plane with DC/DC voltage converter:

- DC/DC converter

- Input: 36 VAC or 48 VDC
- Output: ±12 and +5 VDC

- Slots for connection of 9 device boards
- System busses:

- Clock bus: Clocks and synchronisation
- FC-bus: Control of board connection
- SC-bus: Inter-board communications
- PCM-bus: For voice (speech) connection
- VT-bus, VR-bus: transmit and receive bus for voice connection in the Integrated Cordless system

- Connection of ribbon cable to interconnect a maximum of three cabinets

### Printed board assemblies (boards)

#### CPU-D (ROF 157 5118/1), CPU‑D2 (ROF 157 5118/2), CPU‑D3 (ROF 157 5118/3)

CPU-D_ is the central processing unit for the system. All basic functions necessary for the whole system are located on this board.

- Externally adjustable PCM-clock that can be synchronised to other digital telephone systems
- System switch for PCM-busses with conference unit (MPU) for a maximum of 64 parties
- Realtime clock with battery backup
- Modem (V.22 up to 9600 bd) and 3 bi-directional I/O-ports (V.24) for local and remote connection of operation & maintenance or other I/O (up to 9600 bd)
- Tone generator (PCM) for all traffic tones and 12‑16 DTMF-tones
- Processor monitoring (watchdog) to restart the system if CP or SP malfunctions
- Alarm input for mains power failure
- Alarm output indicating system failure
- Analogue input for background music or music-on-hold
- 1 internal and 3 external temperature sensors
- Measurement of centrally distributed voltages
- Control mechanisms for backplane connection (FC) of the system's device boards
- Communication bus between SP on CPU-D_ and RP on device boards (SC)
- Strapping plug (with red LED) to select between cold and warm start of the PBX
- Processors:

- CP MC 6809: Central processor, traffic
- SP MC 6803: System communication
- RP MC 68HC11: Tones and I/O-functions

- Memory used by CP:

- EPROM (system program): 1 Mbyte
- RAM for data: 320 Kbytes
- on CPU-D3 E2PROM area: 384 Kbytes (not pluggable)
- on CPU-D2 E2PROM: 192 Kbytes (non volatile data, pluggable)
- RAM (call metering data): 8 Kbytes (battery backed-up)
- Dual port RAM for SP: 1 Kbyte

#### CPU-D4 (ROF 157 5124/_)

CPU-D4 is the central processing unit for the system. All basic functions necessary for the whole system are located on this board.

- Externally adjustable PCM-clock that can be synchronised to other digital telephone systems
- System switch for PCM-busses with conference unit (MUSAC) for a maximum of 64 parties
- Realtime clock with battery backup
- Modem (V.22 - V.32bis up to 14.4kbd) and 3 bi-directional I/O-ports (V.24) for local and remote connection of operation & maintenance or other I/O (up to 19.2 kbd). One of the ports is configurable as a RS 485 interface.
- Tone generator (PCM) for all traffic tones and 12-16 DTMF-tones
- Processor monitoring (watchdog) to restart the system if CP or GAL malfunctions
- Alarm input for mains power failure
- Alarm output indicating system failure
- Analogue input for background music or music-on-hold
- Conference function in MUSAC for one conference with 60 conferees or 20 conferences with three conferees or any variants in between
- 1 internal and 3 external temperature sensors
- Measurement of centrally distributed voltages
- FECU connection to enable different system functionality
- Control mechanisms for backplane connection (FC) of the system's device boards
- Communication bus between CP and RP on device boards (SC)
- Strapping plug (with red LED) to select between cold and warm start of the PBX
- connection of PC-OPI
- Processors:

- RP MC 68302 Regional and communication processor
- CP ASIC-CPU(6809) controls traffic, Tones, I/O-functions

- Memory used by CP:

- Flash/EPROM: 1,5 Mbyte
- RAM: 2x128kbyte plus 512kbyte
- BBRAM: in 512 Kbyte steps up to 1024 kbyte
- Dual port RAM CP <-> RP: 1 Kbyte.

#### ELU‑A (ROF 157 5114/n)

This board is available in two configurations. The board is delivered with 8 extensions known as the sub-equipped and with 16 extensions in the standard version.

*) only on board ELU-A2 (ROF 157 5114/2)

ELU-A is a device board for connection of 8 or 16 analogue telephones.

- Local ring generator (25 Hz 80V)
- Connection to the PCM-bus and analogue/digital conversion with DSLAC
- 4 analogue receivers (KRC - Key Receiving Circuit) for DTMF-signalling (digit transmission) from the telephones
- Receiver for decadic pulsing (rotary dial)
- Various transmission parameters can be adjusted by RASC to meet the different market requirements
- Support for indicating "message waiting" *) on certain hotel telephones:

- Reverse line polarity

- Feeding gap when releasing
- Monitoring and remote read-out of system voltages
- Equipment for measurement of generated power on the board for different traffic cases
- Processor:

- RP MC 68HC11 Regional Processor

- Memory:

- 32 Kbytes EPROM (program)
- 31 Kbytes RAM (data)
- 192 Bytes RAM (processor internal)

#### ELU-D (ROF 157 5116/n)

This board is available in two configurations. The board is delivered with 8 extensions known as the sub-equipped and with 16 extensions in the standard version.

QUART |  | Communication circuit for signalling between RP and the telephones

DASL |  | Digital line circuit for the system telephones

ELU-D is a device board for connection of 16 digital system telephones type DBC 6xx, DBC 211, DBC 212, DBC 213, DBC 213 with 2 DSS, DBC 199.

- 16 digital telephone line connections (DASL 2B+D)
- Connection to the PCM-bus with a local switch circuit. Furthermore, the switch adapts the 4 Mbit/sec of the PCM-bus to 2 Mbit/sec, which is used on the board
- Power feed to the connected telephones (-48V DC)
- Processor:

- RP MC 68HC11 Regional Processor

- Memory:

- 32 Kbytes EPROM (program)
- 31,5 Kbytes RAM (data)
- 192 Bytes RAM (processor internal)

#### ELU-D3 (ROF 157 5130/_)

This board is available in three configurations. The board is delivered with 8 or 16 extensions known as the sub-equipped and with 32 extensions in the standard version.

QDASL |  | Four fold digital line circuit for the system telephones

ELU-D is a device board for connection of up to 32 digital system telephones type DBC 6xx, DBC 210, DBC 211, DBC 212, DBC 213, DBC 213 with 4 DSS, DBC 214 with 4 DSS and DBC 199.

- up to 32 digital telephone line connections (QDASL 4 times 2B+D)
- Connection to the PCM-bus with a local EPIC switch circuit.
- Power feed to the connected telephones (-48V DC)
- Processor:

- RP MC 68302 Regional Processor
- DSP AD2186

- Memory:

- 2x128kx8 EPROM (program)
- 2x128kx8 RAM (data)
- 1152 Bytes RAM (processor internal)

#### ELU-C (ROF 157 5115/n)

DSLAC |  | Digital/analogue PCM encoder/decoder (8-bit standard PCM)

DIEC |  | Digital/analogue PCM encoder/decoder (6-bit special PCM)

DEC |  | Digital line circuits (1B+D) for DBC 75x telephones

ELU-C is a device board for connection of 10 (ASB150 01) digital system telephones type DBC 75x.

- 10 digital telephone line connections (DEC 1B+D)
- Conversion from 6-bit special-PCM to 8-bit standard-PCM and vice versa with the aid of digital-analogue-digital conversion (DEC-DIEC-DSLAC)
- Connection to the PCM-bus and analogue/digital conversion with DSLAC
- Power supply for the connected telephones (‑48V DC)
- Processor:

- RP MC 68HC11 Regional Processor

- Memory:

- 32 Kbytes EPROM (program)
- 31 Kbytes RAM (data)
- 192 Bytes RAM (processor internal)

#### BTU-A (ROF 157 5110/n)

This board is available in two configurations. The board is delivered with 4 analogue public lines known as the sub-equipped and with 8 analogue public lines in the standard version.

CM |  | Is a receiver for call metering information (pulses). An optional add-on that is placed on a plug-in daughter board (2 receivers per daughter board). Variants exist for different types of metering pulses: 50Hz, 12KHz and 16KHz.

The standard version of the BTU-A is the ROF 157 5110/n. For the Austrian market a special version, the BTU-A2 (ROF 157 5120/n), is available, featuring on-board call metering and direct in-dialling (DID).

BTU-A is a device board for connection of 4 or 8 analogue public telephone lines.

- 4 or 8 analogue telephone trunk line connections
- 1 to 4 "PFC, Power Fail Circuits" (market dependent). These circuits can connect a reserved telephone to the public telephone line in the event of power failure
- Connection to the PCM-bus and analogue/digital conversion with the DSLAC
- 1 or 2 analogue tone receivers (TRC) for external dial tone detection
- Transmitter for decadic pulsing
- Program control of the telephone lines' data:

- Transmission levels
- Input impedance
- Balance impedance or ATIA
- Sensitivity of the tone receiver
- Sensitivity of the metering receiver

- Processor:

- RP MC 68HC11 Regional Processor

- Memory:

- 32 Kbytes EPROM (program)
- 31 Kbytes RAM (data)
- 192 Bytes RAM (processor internal)

Note

External filter (BDV 11331) for attenuation of 12/16 kHz metering pulses is available for those markets where the level of the metering pulses is so high that they disturb the voice channel on BTU-A.

#### BTU-B (ROF 157 5121/n)

This board is available in two configurations. The board is delivered with 4 trunks known as the sub-equipped and with 8 trunks in the standard version.

HSSC |  | High-speed system communications bus (for future use)

IDEC |  | ISDN D-channel Exchange Controller

The BTU-B (Bothway Trunk Unit for ISDN Basic Access=BA) is a printed board assembly that can be configured to provide any mix of up to 8 digital trunk or subscriber connections in the 2B+D format. This amounts to a maximum of 16 simultaneous calls with associated B-channels or data calls.

- S-interface for connecting up to 8 digital subscriber lines

- This S-interface can service up to 8 terminals on a line and provides remote powering of 2W with 40 V. The ranges of the interface are described in detail in the INSTALLATION INSTRUCTIONS. The line configurations can be short passive bus and extended passive bus.

- T-interface for connecting up to 8 digital trunk lines

- This provides the functionality of an ISDN T-interface to the public network or other PBX. An 8 kHz synchronisation pulse can be extracted from 1 out of the 8 interfaces, synchronizing the exchange to either the public network or another exchange.
- If more trunk connections are needed, the BTU-D board is available with up to 30 trunks (Primary Rate Access=PRA).

- Processor:

- RP1 and RP2 MC 68302 Regional Processor

- Memory: (per RP)

- 128k x 16 (512k x 16) EPROM (program)
- 128k x 16 RAM (data)

#### BTU-C (ROF 157 5111/n)

The BTU-C is available in two versions:

- ROF 157 5111/1 for connecting 8 analogue trunk lines
- ROF 157 5111/2 for connecting 4 analogue tie lines.
- Connection to the PCM-bus and analogue/digital conversion with the DSLAC
- Transmitter for decadic pulsing
- Program control of the telephone lines' data:

- Transmission levels
- Input impedance
- Balance impedance or ATIA
- Sensitivity of the tone receiver

- Processor:

- RP MC 68HCP11A0 Regional Processor

- Memory:

- 32 Kbytes EPROM (program)
- 31 Kbytes RAM (data)
- 192 Bytes RAM (processor internal)

BTU-C (Bothway Trunk Unit) is a printed board assembly with four bothway trunk circuits (BTC) or four DC-loop tie-lines or eight direct indialling trunk lines (ITL).

The following combinations are possible:

- 8 Direct in-dialling trunks
- 4 Both-way trunks or any combination of 4 DID/4 BTC to 7 DID/1 BTC
- 4 DC-loop tie-lines
- 1 "PFC, Power Fail Circuit". This circuit connects a dedicated telephone to the public telephone line in the event of power failure.

The bothway trunks can be equipped with a call metering board CM 12/16.

#### BTU-D (ROF 157 5112/n)

BTU-D (ROF 157 5112/1) is a device board for digital connection to the public network. The connection to the digital public network is utilized with a 30 channel (30B+D) interface.

The board also possesses register signalling transceivers that can be used as a general system resource. They can be connected to any line that requires register signalling.

- 1 digital trunk with 30 channels, 30 B+D with channel-associated signalling (CAS) or ISDN (not available on the REG board)
- 12 register signalling units (RSU)

- MFC or MFE signalling
- DTMF digit receiption
- Tone receiver (TRC) for external dial tone

- Connection to the PCM-bus with a local switch circuit. The switch also adapts the 4 Mbit/sec of the PCM-bus to 2 Mbit/sec, which is used locally and by the public network
- Possibility to synchronize the system's PCM-clock (on CPU-D_) with synchronisation signals from the connected public exchange (not available on the REG board).

REG (ROF 157 5112/2) is a sub-equipped BTU-D board providing only the register function.

- Processors:

- RP MC 68302 Regional Processor (68000-core)
- DSP TMS320C50A Digital signal processor for RSU. The program is loaded from RP

- Memory, RP:

- 1 Mbyte EPROM (program)
- 256 Kbytes RAM (data)
- 1152 Bytes RAM (processor internal)

#### BTU-E (ROF 157 5113/n)

BTU-E is a device board for connecting private analogue tie lines of up to four individuals.

- Connection to the PCM-bus and analogue/digital conversion with the DSLAC
- Transmitter for decadic pulsing
- Program control of the telephone lines' data:

- Transmission levels
- Input impedance
- Balance impedance or ATIA
- Sensitivity of the tone receiver
- 2 or 4 wire speech path selection

The speech connection may be an analogue 2-wire or 4-wire connection with the line signalling transmitted on separate wires, called E&M. The following signalling formats are supported:

- E&M Swedish format
- E&M continuous (A- and D- format)
- E&M discontinuous
- American E&M signalling
- CAILHO
- CEPT L1 (BTU-E2)
- SSAC 15 (BTU-E2)

This board can provide connection for a radio paging equipment supporting the ESPA signalling format.

- Processors:

- RP 68HCP11A0 Regional Processor (HC11-core)
- DSP TMS320C50A Digital signal processor as RSU for CEPT L1 and SSAC 15. The program is loaded from RP

- Memory, RP:

- 128 Kbytes EPROM (program)
- 256x8 bits RAM (processor internal)

#### IC-CU (ROF 157 5128)

DCT |  | Digital Cordless Telephone

DECT |  | Digital Enhanced Cordless Telephone

EPIC-S |  | Extended PCM Interface Controller - Small

FECU |  | Feature Enabling Control Unit

The application Integrated Cordless comprises a Control Unit board (IC-CU) with A-protocol, one or seven Line Unit board(s) IC-LU) for up to 56 Base Stations. Depending on the covered area a certain number of radio Base Stations have to be installed along with the required amount of portable sets.

The Feature Enabling Control Unit (FECU) controls the number of cordless portables that can be handled by the system. This board is connected in position 4 at the front of the IC-CU board. Refer to table in the “Installation Instruction” (1531-BDV 113 08 Uen). The whole system is easy to install with the configuration performed using the Cordless System Manager installed on a PC.

The IC-CU provides:

- 60 voice channels
- 3 LEDs for diagnosis and 3 standard LEDs controlled by the boards RP
- Roaming and intercell hand-over
- PC connection for maintenance and printer connection for error logging data.

Limitations:

- Only one IC-CU board may be installed in a BP250 cabinet furnished with the back panel board PUB5 or higher version. The IC-CU should be mounted left of the IC-LU board(s) as the IC-LU boards are not displayed by RASC.
- The IC-system size is limited to 7 IC-LU boards and a maximum of 56 radio base stations. Up to 108 portables can be connected to the system. All of these boards must be installed in the same cabinet.

#### IC-CU2 (ROF 157 5131)

This board supports the DECT-GAP standard. This standard allows the use of GAP compliant cordless terminals from other manufacturers within the system.

DT |  | Digital Telephone

DECT |  | Digital Enhanced Cordless Telecommunication

EPIC-S |  | Extended PCM Interface Controller - Small

FECU |  | Feature Enabling Control Unit

The application Integrated Cordless comprises a Control Unit board (ICCU or IC-CU2) and optionally one to seven Line Unit board(s) (IC-LU). Depending on the area to be covered a certain number of Base Stations have to be installed. Each Base Station provides a radio coverage (in a cell) for the portable telephone sets that move within the cells.

The Feature Enabling Control Unit (FECU) controls the number of cordless portables that can be handled by the system. This unit is connected in position 4 at the front of the IC-CU2 board. Refer to table in the “Installation Instruction” (1531-BDV 113 08 Uen). The whole system is easy to install and configured with the Cordless System Manager installed on a PC.

The IC-CU2 provides:

- 60 voice channels towards the BP PCM bus
- 3 LEDs for diagnosis and 3 standard LEDs controlled by the boards RP
- Roaming and intercell hand-over
- PC connection for maintenance and printer connection for error logging data.
- connects up to 4 base stations
- 8 concurrent voice channel ADPCM transcoder on the board
- supports remote maintenance with 9.6 kbit/s via CPU-D4 modem

Limitations:

- The IC-system size is limited to 7 IC-LU boards. The IC-CU2 can support 4 Base stations directly and a maximum of 60 base stations in a BP 250 system. The BP 50 supports up to 4 Base Stations directly connected to the IC-CU2. Up to 210 portables can be connected to a BP 250 system and up to 24 portables is the limit for the BP 50.
- Only one IC-CU2 board may be installed in a BP250 cabinet furnished with a back panel board PUB5 or higher version. The IC-CU2 should be mounted left of the IC-LU board(s) as the IC-LU boards are not displayed by RASC. All of these boards must be installed in the same BP 250 cabinet.

#### IC-LU (ROF 157 5129)

This board provides the interface (Upn) 8 x 32 kBit ADPCM channels to the Base Station and synchronises the Base Station to the exchange. The SPU (Speech Processing Unit) takes care of the conversion of PCM to ADPCM and vice versa.

ADPCM |  | Adaptive Differential PCM, a method of reducing the amount of transmitted data. Signal history is recorded and the most probable course is estimated. This information is then transmitted at half of the data rate that standard PCM needs. |
OCTAT-P |  | Octal full-duplex ISDN Upn-interface transceiver |
CLU |  | Cell link unit is the interface to the Base Station featuring remote power feeding either from the back plane or via the external power input at the front of the board from e.g. extra power supply. |
HSCX |  | High-level Serial Communications Controller Extended. |

The IC-LU provides:

- 6 LEDs controlled by the boards RPs

Limitations:

- A maximum of 8 Base Stations may be connected to the IC-LU.
- A maximum of 8 simultaneous calls are available per IC-LU or IC-CU2.

#### MFU (ROF 157 5132)

MFU provides:

- 4 S-/T- ISDN interfaces with individual link configuration. Each S-interface can service up to 8 terminals and provides remote powering of 2W with 40 V
- 4 analogue telephone interfaces as on the ELU-A with Message waiting function and 4 DTMF receivers
- the first analogue line has increased current functionality
- 8 digital system telephone interfaces as on the ELU‑D 3, wherby the DBC 213 and DB 214 telephones are only supported with 2 DSS modules.
- VMU-HD functionality for storing system messages, all types of announcements and individual messages (including text messages on display phones) either in PCM quality 64 kbits/s or utilising a compression algorithm, performed by the DSPs, storing compressed voice data with 32 kbit/s on a Compact Flash card.
- Simultaneous operation of up to 4 voice channels operating either in record- or play-mode and 4 register signalling units if the flash card is mounted.

The board is delivered with following flash card sizes offering a recording time:

- Compact Flash card size 8 Mbyte

- Medium quality 32 Kbits/sec.: 30 minutes
- High quality 64 Kbits/sec.: 15 minutes

This value will be reduced depending on the amount of announcements and infos stored on the Compact Flash card.

#### VMU-D (ROF 157 5117/1)

VMU-D is a device board with a (digital) memory for recorded messages.

- 16 voice channels for recording or playback of recorded information
- Connection to the PCM-bus with a local switch circuit. Furthermore the switch also adapts the 4 Mbit/sec of the PCM-bus to 2 Mbit/sec, which is used locally
- Processors:

- RP MC 68302 Regional Processor (68000-core)
- DSP TMS320C50A Digital signal processor for RSU. The program is loaded from RP

- Memory, RP:

- 256 Kbytes EPROM (program)
- 2 Mbytes Battery backed-up RAM (data), 64 Kbytes for the RP, the remainder is used for recorded information
- 4 Kbytes Dual-port RAM (for communication RP-DSP)
- 1152 Bytes RAM (processor internal).

Voice storage capacity:

- Memory 2 Mbyte

- Medium quality 32 Kbits/sec.: 8 minutes
- High quality 64 Kbits/sec.: 4 minutes

#### VMU-HD (ROF 157 5126/n)

DSP |  | TMS 320C50A

HSSC |  | High speed system communications bus (for future use)

VMU-HD provides storage and control of “special” voice data as there are system messages, all types of announcements and individual messages (including text messages on display phones).

- Simultanuous operation of up to 16 voice channels operating either in record- or play-mode or if selected, 8 voice channels and 4 register signalling units (RSU)

- MFC or MFE signalling
- DTMF digit receiption
- Tone receiver (TRC) for external dial tone

- The board stores voice data on the flash disk either in PCM quality 64 kbits/s or utilising a compression algorithm, performed by the DSPs, storing compressed voice data with 32 kbit/s.
- PCMCIA - ATA compatible disk drives together with a DOS-compatible file system for easy down loading of pre-recorded announcements on a PC; the hard disk can then be plugged back onto the board
- The hardware is prepared for the use of flash-disks that are compatible to the PCMCIA - ATA standard.

The following table shows approximate recording time in hours and minutes for different flash disk sizes:

- Flash disk size: 60 Mbyte

- Medium quality 32 Kbits/sec.: 4h
- High quality 64 Kbits/sec.: 2h

- Flash disk size: 175 Mbyte

- Medium quality 32 Kbits/sec.: 11h 40 min
- High quality 64 Kbits/sec.: 5h 50 min

This value will be reduced depending on the amount of announcements and infos stored on the Flash disk.

#### AUX (ROF 157 5119/1), AUX2 (ROF 157 5119/2) and AUX3 (ROF 157 5119/3)

The AUX is a device board providing one V.24 port. The AUX2 board provides three V.24 ports for the connection of peripheral units and the operation & maintenance facility RASC. Additionally the board provides:

- Temperature sensor for operation & maintenance and the possibility to connect 3 external temperature sensors
- Measurement of the centrally distributed voltages
- Processor:

- RP MC 68HC11 Regional Processor

- Memory:

- 32 Kbytes EPROM (program)
- 28 Kbytes RAM (data)

The AUX3 is used when the feature PC operator is required and includes the firmware for this tool.

- Only 1 V.24 port is operational.

#### Base Station (KRC NB 201 03/_, KRC NB 301 01/1)

The Base Station is used in the Integrated Cordless system to provide radio coverage of up to 200m in the open field down to 30m to 50m within buildings. These ranges depend on the type of building material used.

The Base Station interfaces to the IC-CU amd IC-LU with at least two wire pairs with power feeding. The Base Station operates on an input voltage range of 12 to 56 VDC (KRC NB 201 03/_) and 21 to 56 VDC (KRC NB 301 01/1). This unit functions as the radio interface to the portables and provides up to 8 speech channels. As defined with DECT, the system selects randomly between 120 radio channels to ensure best possible voice communication.

There are three possibilities for power feeding:

- via the serial communication wires with EPP (extra power pairs)
- or without EPP (extra power pairs) and
- by an external adapter converting the mains to a low DC voltage.

### Power equipment

For the BP 250 two different power supplies are available. The transformer providing 36V AC or the battery charger providing 48V DC and facilitating a battery backup with integrated battery unit (BKB 201 001) or separate battery cabinet (BKB 201 002).

The BP 50 has an integrated power supply that comes with or without battery charging facility.

### Telephones

#### System telephones

For more details refer to the System Overview (1555-ASB 150 02 Uen). Below are listed the telephones that are supported by the system. The ELU-D_ board can connect the DBC 600 and DBC 200 proprietary digital system telephones to the exchange.

- BASIC-telephone DBC 210 *), DBC 199
- ECONOMY telephone DBC 201, DBC 601
- ECONOMYplus telephone DBC 211
- STANDARD telephone, DBC 212, DBC 202, DBC 631
- EXECUTIVE telephone DBC 213, DBC 662
- OPERATOR console DBC 214 *), DBC 663

*) |  | only supported on the ELU-D3

Digital system telephones from the DBC 75x family can be connected with the aid of the ELU-C board.

- ECONOMY telephone, DBC 751
- STANDARD telephone, DBC 752 and DBC 755
- EXECUTIVE telephone, DBC 753
- OPERATOR console, DBC 754

The Cordless system supports:

- Portable telephone, DT 288
- Portable telephone, DT 310
- Portable telephone, DT 360
- Portable telephone, DT 368

#### Door Interface Unit (DIU)

The DIU is an interface circuit board connected to an ELU-A board via two extension lines (one for voice connection and door bell signalling and one for the door opener function). If the door opener is already wired the second extension line is not needed.

#### Other telephones

Analogue telephones with rotary dial for decadic pulsing or with keys for digit transmission with tone selection (DTMF) can be connected via the ELU-A board.

### Add-on equipment

#### Thermometer

Up to three external temperature sensors, RPM 603 339/1, can be connected to CPU-D_ and the AUX_-board. Only one reading is displayed on the telephone set.

#### Excess voltage protection

The boards of the PBX are furnished with "secondary" excess voltage protection on the line inputs. For more difficult external conditions a primary excess voltage protection should be mounted. Refer to the “Installation Instructions” for suitable precautions. Main distribution frame SXK 106 4139/1 has room for this primary protection.

Revision: K © Ericsson Enterprise 2003