Chapter 3. 9500 MXC Nodes
Vol. II-3-106 Alcatel-Lucent
Remote Tx Mute
This section sets out the special operating conditions that apply to RAC 40
CCDP links under Rx failure conditions to ensure continued operation of the
remaining link.
• XPIC interference cancellation cannot function if one of the RACs is
withdrawn, its XPIC cables are removed or are incorrectly installed, or there is
a RAC hardware failure.
• Under these conditions the Tx signal (remote transmitter) on the failed link is
muted to prevent unwanted interference to the remaining RAC Rx.
• Table 3-30 lists conditions under which the remote Tx is muted.
Table 3-30. Tx Mute Request Conditions
Where both XPIC cable are removed at the local end, the request to mute will be
sent to both remote transmitters. This mute contention situation is resolved by
applying a bias to the vertical RAC; the remote horizontal RAC Tx is muted, the
remote vertical RAC Tx is not muted.
Example Configurations
The configurations illustrated are:
• Single INU on page 3-106
• Paired INUs on page 3-107
• Protected Co-channel Links on page 3-108
• Ring Node Configurations on page 3-111
Single INU
Figure 3-58 shows a single INU for 2x STM1/OC3 operation.
• One INU/INUe supports a co-channel XPIC capacity of 2xSTM1/OC3, or
2x150 Mbps Ethernet using a DAC GE.
Remote Tx Mute Request Alarms
NCC: RAC 40 plug-in missing.
RAC hardware failure: RAC 40 synthesizer RX LO failure, or synthesizer RX IF
failure.
Path failure: RAC 40 ODU cable unplugged, RX synthesizer not
locked, or RX IF synthesizer not locked.
Path warning: XPIC cable unplugged or XPIC failure.
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