User Manual

AirLink Pro T1/E1 Rack Mount Installer’s Guide
Specifications
Rev. B - 1/97
B-5
T1 DSX-1 Interface
The DS1 interface in the AirLink Pro T1 performs according to the
specifications of DSX-1 cross connects as specified in ANSI T1.102-1987 and
Bellcore # TR-NWT-000 499.
Table B-3
T1 DSX-1 Interface
Transmission Line Rate 1.544 Mbps ± 150 bps
Line Coding Bipolar 8-Zero Substitution (B8ZS) or
Alternate Mark Inversion (AMI)
Impedance 100 Ω ±5%
Pulse Shape An isolated pulse shall fit the template shown in T1.102,
Figure 1. The pulse amplitude shall be between 2.4 and
3.6 volts, measured at the center of the pulse.
Cable Length The pulse shape must meet the mask when the
equipment is connected to a DSX-1 cross connect
located at any distance from 0 to 655 feet (200 meters)
with #22 AWG ABAM cable (or equivalent).
Loss of Signal Threshold Loss of signal is reported upon detection of 175 ± 75
consecutive zeros.
Power Level For an all-ones transmitted pattern, the power in a band
no wider than 3 kHz centered at 772 kHz shall be
between 12.6 and 17.9 dBm. The power in a band no
wider than 3 kHz centered at 1.544 MHz shall be at
least 29 dB below that at 772 kHz.
Jitter The jitter performance of the AirLink Pro T1 meets or
exceeds all input tolerance, output generation, and
transfer function specifications of AT&T Publication
62411. 1983 Edition and Belicore TR-TSY-000499
DSX Line Equalization User-selectable pre-distortion to offset cable lengths
of:
0 - 133 feet 0 - 40 meters
133 - 266 feet 40 - 81 meters
266 - 399 feet 81 - 122 meters
399 - 533 feet 122 - 162 meters
533 - 655 feet 162 - 200 meters