9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-3-29
• When both ends are running 4.0 SW or later, RAC 40s auto-configure both
ends to Standard.
Protected RAC 40 operation is essentially the same as for non-protected, but
where a conflict occurs, the decision falls in favour of the Standard modem
profile.
For more information, refer to RAC 40 under Link/Ring Configuration
Procedure, Volume IV, Chapter 7.
RAC 40 System Options
Refer to Table 3-14 for system options. Note that the capacity supported on one
RF channel is double the capacity listed in the table; one RAC 40 link is operated
on the vertical polarization, the other on the horizontal.
Table 3-14. RAC 40 System Options: ETSI and ANSI
When used to transport Ethernet data the nominal equivalent Ethernet capacity
per RAC 40 is:
• Nx 2 Mbps to 150 Mbps for ETSI, or
• Nx1.5 Mbps to 150 Mbps for ANSI, or
• 150 Mbps for 1xSTM1 or OC3.
XPIC typically provides up to a 20+ dB improvement in polarization
discrimination. The actual improvement will depend on the native discrimination
provided at antenna alignment, and any reduction of this discrimination caused
by atmospheric effects (fading). RAC 40s may also be used in 2+2 hot standby or
diversity configurations to provide protected co-channel paths using paired
From SW release 4.0 the ‘Standard’ RAC 40 modem profile is used in all
instances, except where operation with an INU/INUe running SW 3.3 or earlier is
required.
Capacity Channel Bandwidth Modulation
64xE1 27.5 / 28 MHz 64 QAM
75xE1 27.5 / 28 MHz 128 QAM
1xSTM1 27.5/28 MHz 128 QAM
70xDS1 30 MHz 32 QAM
84xDS1 30 MHz 64 QAM
100xDS1 30 MHz 128 QAM
1xOC3 30 MHz 128 QAM
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