General DataComm 551 Operating And Installation Instructions page 121

TECHNICAL INFORMATION
Communication line
Line impedance
Network physical interface
Network transmitter
Pulse amplitude
Without surge protection
With surge protection
Height variation with pulse pattern
Unbalance in height of adjacent negative and positive
pulses
Width of output pulse (half amplitude)
Unbalance in width of positive and negative pulses
Time between two consecutive pulses of opposite polarity
(measured at half amplitude point of leading edges)
Maximum rise or falling time
Overshoot at trailing edge of pulse
Line Build-Out
Output jitter
Network receiver
Operating range
Input impedance
Jitter tolerance
Longitudinal balance
Equipment interface
Physical interface
DataComm Enclosure and DataComm Modem Shelf
Universal System Shelf
Electrical interface
Transmitter
Pre-equalization
Impedance
Receiver
Pre-equalization
Impedance
Supervisory terminal interface
Physical interface
Interface standard
Baud rate
Character format
A-2
TECHNICAL CHARACTERISTICS (Cont.)
Item
Electrical (Cont.)
Characteristic
T1 digital carrier (non-loaded, staggered-twist ABAM, PIC, or
pulp-insulated exchange-type cable, 19 to 26 gauge)
100Ω
RJ48C modular jack
May vary over a cycle of 60 Hz current.
2.70 to 3.30 V at 60˚F
2.40 to 3.00 V at 60˚F
2% (maximum)
200 mV (maximum)
324 nsec ± 45 nsec
20 nsec (maximum)
648 nsec ± 15 nsec
100 nsec
10% to 30% of pulse amplitude
0, 7.5, or 15 dB (selectable or automatic) at 772 kHz
< 0.5 dB
0 to 36 dB of cable loss at 772 kHz
100Ω
Conforms to specifications defined in AT&T PUB 62411,
December 1988
35 dB from 50 to 1500 kHz
DB25S (25-pin subminiature female connector)
DB15S (15-pin subminiature female connector)
Crystal Semiconductor CS61534/CS61574 PCM Line
Interface
0 to 655 feet of line length
100Ω
0 to 655 feet of line length
100Ω
DB25P (25-pin subminiature male connector)
EIA/TIA-232-E
2400, 4800, 9600, and 19,200 bps
8/N/1, 7/N/1, 7/O/1, and 7/E/1 (word length/parity/stop bits)