REPEATER CONTROL UNIT

The RCU100 Repeater Controller provides a means for remotely controlling equipment and retrieving information from a repeater site.

 

The RCU100 is supplied in a standalone housing 210mm (w) x 145mm (d) x 50mm (h).

 

Control of the unit or retrieval of information may be performed in three different ways:-

 

  1. 5 tone ZVEI codes or similar signalling systems

  2. DTMF codes

  3. RS232D

 

Optional modules fitted inside the unit allow the unit to support:-

 

  1. 1200 baud modem tones

  2. CTSS control tones

 

The unit is arranged with an input radio port and an output radio port.

These are normally calibrated to provide 0db loss, so that the unit may be inserted in a channel without affecting performance.

 

If installed together with an LBU200, the unit can be arranged to receive control information from a number of different radio channels

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LINE BRANCHING UNIT

 

The LBU200 Line Branching system is a rack based system that allows 4 port 4-Wire E & M line branch cards to be installed. The rack provides power and 4 wire E & M connections to the 4 port cards plugged into the system.

 

The unit consists of a 3U x 19" equipment rack to which the required number of 4 port cards may be fitted.

 

Each 4 port card contains the circuitry for both the audio and the signalling.

Each 4 port card may be cascaded with another to provide an 8 port unit without losing the use of any of the ports.

Further cascading can be accomplished by connecting one of the ports to another card or set of cards.

 

The LB200 4 port cards are supplied in 3U format by 6 HP.

Up to 12 x 4 port cards may be fitted to an LBU200 rack if wired for 6 wire circuits (earth input and earth output) or 7 maximum if fitted for 8 wire circuits.

 

A power supply card is available for powering off 24volt or 48volt supplies.

 

Two versions of 4 port card are available.

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2Mbit E1 to ANALOGUE LINE BRANCHING / CONFERENCING SYSTEM

 

The LBU500 Line Branching / Conferencing system interfaces a 2 Mbit CAS E1 link to analogue 4 Wire E & M circuits.

 

The E1 link provides 30 timeslots of 64kBit data/voice and utilises 2 timeslots for signalling and synchronization.

 

The equipment is housed in two by 19” x 3U height racks, with 15 timeslots being accommodated per rack.

 

The equipment may be operated in 3 different environments:

 

As a Digital to Analog line branching and conferencing interface.

In this mode each line branching card (LBU501) provides up to 4 analog 4 Wire E&M ports from each timeslot.

Up to 20 separate conference groups of up to 30 channels may be configured.

The line branching cards provide a means to combine or split 4-Wire 600-ohm E & M audio circuits without loss or impedance variation. Audio and signalling incoming to a port are re-transmitted to all other selected ports.

 

As a standard Channel Bank interface.

In this mode the Analog single port cards provide a 4 Wire E&M port for each timeslot.

 

As a Drop and Insert interface at sub-stations or hi-sites.

The equipment makes provision for the installation of a second 2Mbit E1 card (2MB001) to allow drop and insert functions on a single 2Mbit E1 stream.

 

A single or multiple timeslot(s) may be dropped off and optionally re-inserted and interfaced to analog interface cards.

The analog cards may be either branching cards (LBU501) or single port 4 Wire E&M cards (LBU503).

Provision is also made for the installation of up to two Ring down cards (SIC101) (2 wire central battery circuits) for interfacing conventional telephone instruments to a timeslot in a 2Mbit stream.

2Mbit CAS SPLITTER COMBINER

(REPLICATOR) SYSTEM

The LBU600 system provides a housing for a number of E1 conferencing cards with their redundant backups and an automatic changeover card to switch between the primary and backup cards

 

Each LBU601 card conferences three E1 circuits with CAS Signalling Protocol.

 

Each timeslot within each stream is conferenced with the other streams on a one to one basis i.e. timeslot 1 of stream 1 is conferenced with timeslot 1 of stream 2 and timeslot 1 of stream 3, for all 30 timeslots.

 

Signalling is conferenced in a similar manner, with an active signal on one stream activating the signalling on the other two streams.

 

An additional LBU601 card may be fitted as a redundant backup.

 

An LBU603 card provides an automatic changeover facility between primary and backup LBU601.

The card monitors the performance of each of the LBU601 cards and will physically switch the E1 circuits over to the backup card in the event of the main card failing to respond to interrogation.

 

The E1 link provides 30 timeslots of 64kBit data/voice and utilises 2 timeslots for signalling and synchronization.

 

The equipment is housed in a 19” x 3U height rack, and allows up to 4 sets of cards to be installed when backups are provided or 8 cards if backups are not fitted.

 

The system houses 2 power supply cards on the left hand side of the rack to convert a 50 volt supply to the 12 volts required by the system.

The 2nd card is configured as a hot standby of the primary power card.

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2Mbit E1 to ANALOGUE 4 WIRE E&M AND SERIAL DATA SYSTEM

The LBU700 system interfaces a 2 Mbit CAS E1 link to analogue 4 Wire E & M circuits and or serial data links.

 

The E1 link provides 30 timeslots of 64kBit data/voice and utilises 2 timeslots for signalling and synchronization.

 

The equipment is housed in a 19” x 3U height rack, and allows up to eight x 4 timeslot cards to be installed.

Each card may be a four timeslot 4  wire E & M voice card or a four timeslot data card with each timeslot providing a 64 Kbit /s bandwidth.

 

The equipment is intended as a channel bank replacement or anywhere data or analogue voice circuits need to be conveyed over a 2Mbit/s backbone link.

 

Provision is made on each rack for the installation of serial multiplex cards (up to two) to allow multiple slower serial data links to be transported over a single timeslot. Each card supports 5 ports at up to 115200 baud.

 

The last card slot allows for only two timeslots (an E1 has a total of 30 timeslots, two being used for synchronisation and signalling), although the card installed is still a four timeslot card to maintain compatibility with the other cards in the system.