Chapter 7. Node and Terminal Plug-ins
Vol. IV-7-14 Alcatel-Lucent
Protection Options
Table 7-2 describes 9500 MXC protection options.
• The Node supports all options.
• Paired IDU 155o and IDU 20x Terminals support hot standby or space
diversity.
Table 7-2. Protection Types
Before configuring a protected LINK or RING, the protection primary/secondary
pairings must first be established in the Protection screen.
Protection Type Description
Hot Standby Hot standby is normally configured for use with a single
antenna, where the two ODUs, set to the same frequency, are
connected to the antenna via a coupler.
For the Node, both RAC/ODU combinations are receiving,
with the least errored receive stream being selected on a
block-by-block basis.
For the Terminal both IDU/ODU combinations are receiving.
IDU 155o and IDU 20x support hitless path protection, with
the least errored receive stream selected on a block-by-block
basis.
Frequency Diversity Frequency Diversity is normally configured for use with a
single antenna, where the two ODUs, set to different
frequencies, are connected to the antenna via a coupler. Both
RAC/ODU combinations are on-line transmitting and
receiving the same traffic, with the least errored receive
stream being selected on a block-by-block basis.
Space Diversity Space diversity requires two antennas, each with an ODU.
The primary RAC/ODU or IDU/ODU should be assigned to
the top antenna. Both receivers are receiving, with the least
errored receive stream being selected on a block-by-block
basis.
Ring Protection Ring protection requires two antennas, each with an ODU;
one each for the East and West facing directions. If operating
on the same frequency band, the co-located ODUs would
normally both be Tx high, or Tx low (and set to different
frequencies). They operate as two back-to-back non-protected
radios, with protection provided by circuit wrapping at E1 or
DS1 around the ring.
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