Base Station Controller (BSC 2212)

Base Station Controller (BSC 2212)

Base Station Controller-2212 is the central component of RM Mobile Data system.

The BSC-2212 provides error-free, digital communication between a host computer and multiple mobile units, over a full-duplex, FM radio channel. The BSC Channel contention among the mobile units is managed by the BSC using Digital Sense Multiple Access (DSMA) techniques. Automatic Gain Control (AGC) circuits in the BSC compensate for variations in mobile signal deviation.

The BSC-2212 installs at the transmitter site, and is interfaced directly with the base radio. It automatically controls the operation of the radio during digital transmission.

Communication with the host computer is implemented over Ethernet or a RS232C data port, usually via telephone modem or microwave links from the control center. The BSC uses a specially-developed host message protocol to ensure fast and accurate communication with the host.

Technical Specifications

Data Rate 22KB Wide Band (25Khz channels), 11Kb, Narrow Band (12Kb). Programmed ahead of time.
Radio Protocol
Radio Modulation 4800 bps: Nyquist Filtered Bipolar (NFB). 9600 bps: 2 level Pulse Amplitude Modulation (PAM) with spectral precoding. 22k: 4 level FSK
Channel Contention Combination of Digital Sense Multiple Access (DSMA) and ALOHA
Forward Error Corrections 4800 bps: Modified Reed-Solomon. Single bursts of 56 bit errors are correctable. 9600 ― 22k bps: Interleaved Modified Reed-Solomon. Single bursts of 96 bit errors are correctable.
Address Capacity: 4800 bps: 4096. 9600 bps ― 22k: 1,048,576
Dynamic Group IDs: 7 maximum + All Call ID
CW Identifier User programmable to 12 characters
Radio Interface
Transmit Audio Level 0 ― 10 Vpp in 0.25 dB Steps
Transmit Driving Ability 600 ohms minimum load resistance. Stable with any output loading
Receive Audio Level 100 mVpp to 10 Vpp
Receive Input Impedance 100k Ohm
Equalization DSP Equalizes transmit and receive audio distortion
Automatic Gain Control 4800 bps, 9600 bps: AGC in Base Station Controller receives messages with deviation between 700 Hz and 7000 Hz. 9600 bps: Adjustable AGC 4.8k ― 22k
Base Station DB25P, DTE, 19k ― 56k; DCD from Telco Modem Controls Base Station Controller power; Ethernet
Humidity 0 ― 95% RH, without condensation
Altitude SL to 10,000 feet
Power BSC: 120/240 VAC or 10 ― 15 VDC auxiliary. 220mA
Dimensions 1.75″ H x 19″ W x 8″ D
Weight 3 lb

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Fax: 858-530-1063
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