Chapter 1: Product description
Wireless operation
Page 1-7
Wireless operation
This section describes how the PTP 670 wireless link is operated, including topology,
modulation modes, power control and security.
Wireless topology
PTP 670 supports operation in two distinct topologies:
•
Point to point (PTP)
•
High-capacity multipoint (HCMP)
PTP topology
The PTP topology provides Ethernet bridging over a point-to-point wireless link consisting of
one outdoor unit (ODU) configured as a TDD Master and one ODU configured as a TDD Slave.
The PTP topology supports the following features:
•
Range: Up to 250 km
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Operating frequencies: 4800 MHz to 5875 MHz, 4900 MHz to 6050 MHz
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Channel bandwidth: 5 MHz, 10 MHz, 15 MHz, 20 MHz, 30 MHz, 40 MHz, 45 MHz
•
TDD ratio: 1:5, 1:3, 1:2, 1:1, 2:1, 3:1, 5:1, adaptive
•
Link optimization: IP or TDM
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TDD synchronization using PTP-SYNC
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Spectral efficiency: Up to 10 bps/Hz
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Aggregate data capacity: Up to 450 Mbps
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Out-of-band management
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Synchronous Ethernet
•
IEEE 1588 Transparent Clock
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TDM: Eight T1/E1 circuits using the Network Indoor Unit (NIDU)
HCMP topology
The optional HCMP topology provides Ethernet bridging over a star of individual point-to-point
wireless links connecting one ODU configured as a TDD Master with up to eight ODUs
configured as TDD Slaves. Each of the individual wireless links is connection-oriented and
operates in a dedicated time slot of the TDD frame. The capacity of the sector is shared
between the individual links, but apart from this each of the links has efficiency and
performance similar to links provided in the PTP topology.
The Master ODU will normally be installed with a connectorized sector or omni-directional
antenna. Slave ODUs will normally be installed with an integrated or connectorized directional
antenna.
