Ceilometer CT25K
CT25K-U059en-2.1 User’s Guide
7
Answer Mode Standard Frequencies:
V.21 Bell 103
Mark (1) 1650 Hz 2225 Hz
Space (0) 1850 Hz 2025 Hz
Originate Mode Optional
Signal Level: -10 dBm (0.3 V) into 600 Ohm standard
(Jumper selectable)
Max. Distance to Operate 0...16 km (0...10 miles)
with 22 AWG (0.35 mm
2
) unshielded
twisted pair
The signal circuit is electrically floating to overvoltage protection rating
(300V-500V).
1.2.5.2 Modem board DMX50
Processor: Intel 80C32 custom version
Modem: Signal Processor Chip Silicon Systems SSI
73K224L
Modem standards supported: V.21/ V.22/ V.22bis and Bell 103, Bell 212
Modulation method: 300 FSK/ 1200 DPSK/ 2400 QAM
Compression & error correction: V. 42, V.42bis and MNP 2-5
Adaptive equalization for optimum performance over all lines.
1.2.5.3 ANet Interface DMX611
The DMX611 serves as an interface between the CT25K and Vaisala
proprietary ANet and INet busses.
Baud Rate 2400
Signal Level 0 dBm
Max. Distance to Operate 0…5 km multi-drop network
Twisted pair 22 AWG
Standard Character Frame 8 Bit synchronous
Character Code Binary
iNet protocol Packet format.
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