BBM-384  Baseband modem

The MuLogic BBM-384 is a baseband modem for synchronous and asynchronous operation at data rates ranging from 225 bps to 38.4 Kbps. The BBM-384 provides reliable data transmission over unloaded, unconditioned local area telephone wire or twisted-pair cables. 
The modem is designed to operate within a variety of network configurations like point-to-point, multipoint and tail-circuits and features a full implementation of CCITT V.54 test facilities. 

The modem is available in 3 versions:

• BBM-384D: Standard desktop housing
• BBM-384S: Rugged steel desktop housing.
• BBM-384R: Rack card for use in a 19", 4HE card frame.

                          BBM-384D                                                                                        BBM-384R

BBM-384S

FEATURES

• Synchronous and asynchronous operation up to 38400 bit/s. 
• Half-duplex and multipoint operation over 2 or 4-wire lines. Full duplex on 4-wire lines
• Ideal for SCADA applications over private copper networks.
• Transparent data transport: Supports a.o. Modbus RTU, DNP3 and Mirrored Bits^® protocols.
• Very low back-to-back data delay time (latency): 0,67 ms at 9600 bps.
• Fall-back/fall-forward to follow variable data rates in tail-circuits of voice band modems. (option)
• Supports CCITT V.54 master/slave diagnostics in point-to-point, multipoint and tail-circuits. 
• Test loop activation at front panel.
• Test loop activation from interface circuits 140 and 141. 
• Adaptive statistical equalizer to increase data rates over longer lines. 
• Available as desktop unit and rack card.
• Internal 230Vac power supply on BBM-384D.
• Internal 11-38Vdc or 20-75Vdc power supply on BBM-384S and BBM-384R.
• External power adapter for 100..240Vac power supply on BBM-384S.

OPERATION

The BBM-384 series operates over unloaded, unconditioned local area data channels or twisted-pair cables at distances up to 50 km on cables with 0,5 mm copper gauge. 
The actual distance obtainable for a specific application varies depending on data rate and wire diameter used.

The BBM-384 offers local loop-2 and loop-3 test facilities. These test loops can be activated by means of interface circuits C.140 and C.141, or manually by push buttons at the front panel. 

The BBM-384 offers a full CCITT V.54 implementation including addressed test loops for multipoint or tail-circuits. This ensures an entire network, including the tail-circuit modems to be subjected to a series of tests without requiring any action from remote terminals. 

TECHNICAL SPECIFICATIONS

• Modulation: Differential bi-phase modulation, standard and alternative. 
• Operation: Synchronous and asynchronous, in point-to-point or multipoint network topologies. 
• Half-duplex operation over 2 or 4-wire lines or full-duplex over 4-wire lines. 
• Data rates: 38.4, 22.8, 19.2, 14.4, 9.6, 7.2, 4.8, 3.6, 2.4, 1.8, 1.2, 0.9, 0.6, 0.45, 0.3 and 0.225 Kbps. 
• Transmission level: Adjustable in 8 steps, from +6 dBm to -15 dBm. 
• Carrier threshold: Programmable for -30 dBm or -43 dBm. 
• Line equalizer: Adaptive statistical equalizer, activated on the transmit or receive side. 
• Line impedance: Selectable 150W or 600W balanced or high impedance (10 kW when receiving). 
• Interface: to CCITT V24/V28, with fixed DTR and RTS circuits (and from DTE). 
• Asynchronous data formats: 8, 9, 10 or 11 bits. 
• Fall-back/fall forward (option): Switching time less than 32 bits. 
• Diagnostics: In accordance with CCITT V.54 using circuits C.140 and C.141. 
• Control of up to 256 V.54 addresses for multipoint and tandem connections.
• Power supply (standard on BBM-384D): 230 Vac. (+10%, -15%) 50-60 Hz, 5 W max.
• Power supply (standard on BBM-384S and R): 11..38Vdc or 20-75Vdc, 5 W max.
• Operating temperature: -25°C to +70°C
• Isolation (line to circuit, power to circuit): 1500Vac ( 3000Vac available on request)
• Dimensions BBM-384D: 240 x 160 x 54 mm (L x W x H)
• Dimensions BBM-384S: 240 x 160 x 31 mm (L x W x H)
• Dimensions BBM-336R: Panel: 5TU/4HU, length 240mm

(Note*: low noise line, receive equaliser enabled)

MuLogic b.v. - Olivier van Noortstraat 4 - 3124 LA Schiedam - The Netherlands - Tel: +31 10 4700077 - Fax: +31 10 4700958

www.mulogic.com