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Wireless operation
In some regions ATPC is a regulatory requirement and in these cases ATPC cannot
be disabled.
The power control loop compensates for slow variations in received power and does
not respond to fast fading that occurs in multipath channels.
Maximum transmit power
Maximum transmit power is the maximum power that the PTP 800 is permitted to
generate at the waveguide interface assuming that ATPC is disabled, or the link
loss is high enough such that ATPC is not activated. The equipment limit for
maximum transmit power is defined by modulation mode, band, channel bandwidth
and standards body or region. The spectrum license limit is determined by the
maximum EIRP permitted by the individual license, the antenna gain and feeder
loss. The maximum transmit power that can be configured for PTP 800 is limited by
the more restrictive of the equipment limit and the spectrum license limit.
Maximum transmit power defaults to the maximum permitted as described above,
but can be reduced if necessary using Step 3 of the Installation Wizard, or the
Configuration page of the web-based interface.
Security
PTP 800 provides optional 128-bit and 256-bit encryption using the Advanced
Encryption Standard (AES). The implementation in PTP 800 has been validated
against Federal Information Processing Standard Publication 197 (FIPS-197) in the
Cryptographic Algorithm Validation Program (CAVP) of the US National Institute of
Standards and Technology (NIST).
AES encryption protects all traffic over the wireless link, including in-band and out-
of-band network management traffic. Each CMU behaves as a cryptographic device
in which the Ethernet interfaces transmit and receive plaintext data, and the IF
interface transmits and receives cipher text data. The IF cable and ODUs are
outside the cryptographic boundary.
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Chapter 1 Product description
phn-1478_005v000
Apr 2010
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