User`s manual

24mA @ -12 VDC ± 5%
Operating Temperature: 10-55° C
Relative Humidity: 5-90%, noncondensing
Altitude: 0 to 12,000 feet
Compliance: AT&T Technical Publication 62310
AT&T Technical Publication 41458
CSU/DSU Transmit Pair
Output Impedance: 135 ohm ± 10%
Output Pulse: 50 ± 5%
Output Amplitude: 2.8V ± 0.1V
CSU/DSU Receive Pair
Impedance: 135 ohm ± 10%
Input Levels: Maximum line loss of 43db