Bell 5902 - Specifications

5902 Bell 202 Modem Hardware Manual
October 19, 2007
44
7 Specifications
Disclaimer: Control Microsystems reserves the right to change product specifications without
notice. For more information visit www.controlmicrosystems.com .
Modulation
Bell 202 Frequency Shift Keying (FSK)
Mark = 1200 Hz
Space = 2200 Hz
Soft carrier turn-off = 900 Hz
Frequency accuracy +/– 0.4%
Data Rate
1200 baud
Transmit Carrier
Switched or constant
Duplex
full or half
half duplex requires DTE to implement hardware RTS/CTS
handshake
Wires
two or four
Transmit Level
–35 dBm to 0 dBm into 600 ohms
potentiometer adjustable
Receive
Sensitivity
–30 dBm to +3 dBm
potentiometer adjustable to –40 dBm
Output
Impedance
600 ohm balanced
transformer isolated
Input Impedance
600 ohm balanced
transformer isolated
Anti-Streaming
none, 10Sec, 30Sec, 60Sec
RTS/CTS Delay
wire: 25ms, 50ms, 125ms, 250ms
radio: 67ms, 133ms, 266ms, 1000ms
CTS Hold Time
1ms, 8ms
Soft Carrier Tone
Transmit Time
none, 13ms, 25ms, 38ms
Soft Carrier Tone
Detect Delay
4ms to 10ms
Carrier Detect
Delay
wire: 19ms, 30ms, 51ms, 92ms
radio: 33ms, 67ms, 133ms, 265ms
Carrier Loss
Delay
6ms, 10ms, 23ms, 39ms
constant carrier reception half duplex
Carrier Detect
Level
-30 dBm, adjustable from -20 dBm to -40 dBm
Radio Frequency
Carrier Detect
Input
optical coupler LED input
5 VDC at 1mA
12 VDC at 3mA
24 VDC at 7mA
Radio Carrier
Input Mode
use or ignore
Radio Transmit
Key Output
optical coupler open collector transistor
5 to 15 VDC
25mA