Cisco CX-FEIP-1TX= Installation and con?guration User's Guide Page 105

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PTP 800 Series User Guide 1+1 Hot Standby link protection
phn-2513_004v000 (Oct 2012)
1-65
The other CMU and ODU / IRFU transceiver are called the inactive units and these will
remain on standby waiting to take over in case of a failure of the active units. If a failure
does occur, an automatic protection switch will take place and the previously inactive units
will take over as the active units. A protection switch may take place at one end of the link
independently of the other end of the link. A protection switch may also be executed by
management action.
Primary and secondary units
At each end of the link, one CMU must be configured as a Primary unit, the other as a
Secondary unit. The decision of whether the Primary or Secondary CMU becomes active is
automatically controlled by the CMU application software. In normal fault free conditions,
the CMU application software will select the Primary CMU and associated ODU / IRFU
transceiver to be the active unit.
1+1 Hot Standby link antenna options
Single antenna per end
The ODUs installed at the same end of a 1+1 Hot Standby link can share an antenna. This
is done with an ODU Coupler Mounting Kit (Figure 23). The Coupler Mounting Kit can be
supplied with equal or unequal coupling. The equal coupler provides the same path loss to
the two ODUs where as the unequal coupler provides a lower path loss to one of the ODUs.
As the unit configured as Primary is expected to be the active unit for most of the life of a
1+1 Hot Standby link, the highest link availability is achieved by connecting the Primary
ODU to the arm of the unequal coupler with the lowest path loss.
IRFUs with the 1+1 Tx MHSB option are designed to connect to a single antenna via
elliptical waveguide. Although this IRFU option is supplied with two transceivers, only the
active transceiver will radiate at the antenna port. This is achieved by an RF switch which
is an integral part of the 1+1 IRFUs. The position of the switch is controlled by the CMU
application software. The RF switch is not used for the receive direction and both
transceivers will simultaneously receive from this same antenna. This is achieved through
the use of a coupler which is internal to the IRFU. The 1+1 Tx MHSB option can be
supplied with equal or unequal receiver coupling. For more information on the IRFU
options, please refer to Planning 1+1 Hot Standby links on page 2-35.
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