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APPENDIX A
TECHNICAL CHARACTERISTICS (Cont.)
Item
Specifications
Echo Canceller
Maximum Tail Circuit Delay
8 ms
In-Band E&M Signaling (-002 and -003)
Bandwidth Overhead
No overhead bandwidth required.
Pulse Distortion
±625 microseconds.
Minimum pulse width
20 ms for a 6.4 kHz channel
20.625 ms for a 4.8 kHz channel.
FAX Bypass (-002 only)
Protocol
CCITT Group 3-T.4 (1988), T.30 (1988).
Transfer Rate
Protocol V.21 (300 bps)
Data V.29 (9.6/7.2 kHz) or V.27 ter (4.8/2.4 kHz)
Channel Rate
6.4 kHz.
Physical
Base card
9.0 in. x 6.25 in. (22.86 cm. x 15.88 cm.)
Piggyback Card
6.0 in. x 4.6 in. (1.5.24 cm. x 11.68 cm.)
Environmental
Operating Temperature*
32°F to 124°F (0°C to 50°C)
Nonoperating
–40°F to 186°F (–40°C to +85°C)
Humidity
95% relative humidity with no condensation
Altitude
Operating
10,000 ft (3048 m)
Nonoperating
40,000 ft (12,192 m)
* Derate operating temperature by 1°C/1000 ft. above sea level
A-2