Chapter 3. 9500 MXC Nodes
Vol. II-3-110 Alcatel-Lucent
4+4 Hot-standby Operation
Figure 3-62 illustrates 4+4 ‘quattro’ operation where CCDP (co-channel dual
polarization) and ACCP (alternate channel co-polarization) are used to support
hot-standby protected operation on four co-path links.
• Supports a maximum of 4x 75xE1, 4x 100xDS1, or 4x STM1/OC3 on two 28/
30 MHz radio channels.
• CCDP with ACCP supports the four co-path links on two 28/30 MHz radio
channels.
• Uses the V and H polarizations on two adjacent channels. Figure 3-61
illustrates the channel/link alignment.
• Figure 3-62 illustrates the ACCP pairings on F1 and F2 (channel 1 and
channel 2), and CCDP pairings on the cross-polarized co-channel pairings.
Figure 3-61. Channel/Link Alignment for 4+4 CCDP and ACCP
• Cascaded couplers are used to connect the protected ODU pairings to the
common antenna. Couplers must be equal loss.
• The nominal loss through each coupler is 3.5 dB, meaning an additional 14 dB
loss must be included in the system gain calculations for each link.
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