9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-8-5
• When a protected hot-standby or diversity link is returned to two
non-protected links, the circuit connections established for the protected link
will stay with what was the primary RAC. There will be no circuit
connections assigned to what was the secondary RAC. Similarly, for
protected DACs the circuit connections established will stay with what was
the primary DAC. There will be no circuit connections assigned to what was
the secondary DAC.
9. When two non-protected links (2xRAC, RAC with DAC 155oM, or 2xDAC
155oM) are selected for RING protection, the ring will assume the circuit
connections (traffic and auxiliary) of the east RAC or DAC.
• To ensure that circuit connections of what will be the east link are retained,
the selection of the east RAC or DAC must be made by first highlighting the
RAC/DAC which is to become east, and then selecting its secondary partner
from the Partners sub-menu.
• When a ring is returned to two non-protected RACs and/or DACs, the circuit
connections established for east will stay with what was the east RAC/DAC.
There will be no circuit connections assigned to what was west.
10. Ring protection provides options for wrap and unwrap actions.
• Wrap and unwrap criteria may be separately selected for Standard and
Sensitive. Refer to Ring Protection Switching Criteria on page 3-92,
Volume II, Chapter 3.
• An Error-free Timer supports selection of 10 seconds, or 1, 5, or 10 minutes.
An unwrap will occur once all wrap criteria have been cleared for the
selected period.
• A Delay Ring Unwrap timer supports setting of a time of day for an unwrap
(providing all wrap criteria have been cleared).
11. For a wrapped ring link the RAC Online LEDs remain unlit until the unwrap
error-free timer and, if set, the time of day timer times out
1
.
12. For a hot standby or space diversity link, the primary RAC is default online
transmitting, and the secondary RAC is controlling online receiving (both
RACs are receiving data but the assigned secondary RAC controls the hitless
switching between each stream and sends data to the TDM bus).
13. For a frequency diversity link, both primary and secondary RACs are online
transmitting, and the secondary RAC is default controlling online receiving
(both RACs are receiving data but the secondary RAC controls the hitless
switching between each stream and sends data to the TDM bus).
14. For protected DACs, primary and secondary DAC operation is determined by
the protection type selected:
1
Even when RAC/RAC communication is restored on the wrapped link, the RAC Online LEDs remain
unlit until the unwrap timers time out.
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