User's Manual

INSTALLATION AND MAINTENANCE MANUAL
LYNX.sc E1 FAMILY
SPREAD SPECTRUM RADIOS
SEPTEMBER 1999
SECTION 5: APPENDICES PAGE 5-1
5. Appendices
Appendix A - Digital Line Interface Specifications
Information in Appendix A is referenced to the following document: ITU-T G.703
1. General Characteristics
Bit rate: 2048 kbits/s ±50 ppm
Code: HDB3
2. Specifications at the output ports
Bit Rate 2.048 Mb/s
Pulse Shape All marks of a valid signal must conform with the mask irrespective of
the sign. The value V corresponds to the nominal peak value.
Pair(s) in each Direction One Coaxial pair
Test load impedance 75 ohms resistive
Nominal peak voltage
of a mark (pulse)
2.37 V
Peak voltage of a space
(no pulse)
0 ±0.237 V
Nominal pulse width 244 ns
Ratio of the amplitudes
of positive and negative
pulses at the center of
the pulse interval
0.95 to 1.05
Ratio of the widths of
positive and negative
pulses at the nominal
half amplitude
0.95 to 1.05
Table A-2: CEPT-1 Interconnection Specification