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11 N T R O D U C T I O N
The Motorola OM 2000 Out-of-band Modulator links the digital headend equipment
with the distribution system by combining the various out-of-band inputs into a
quadrature phase shift key (QPSK)-modulated signal. It converts multiple digital input
streams into an RF output signal for transmission over the cable system. Figure 1-1
i l l u s t r a t e s t h e O M 2 0 0 0 .
Figure 1-1 — OM 2000 Out-of-band Modulator
T h e O M 2 0 0 0 :
• Receives Ethernet User Datagram Protocol (UDP) packets from a controlling
p r o c e s s o r
• Multiplexes downstream data from multiple sources
• Provides forward error correction (FEC) encoding of the bitstream, as well as
interleaving and randomization
• Provides downstream OPSK-modulated output within the 71 to 129 MHz range
• Provides industry-standard Ethernet lOBase-T connectivity for operation,
administration, maintenance, and provisioning (OAM&P)
• Performs periodic insertion of internally stored messages
• Controls and provides status/alarm reporting using Simple Network Management
Protocol (SNMP)
1
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