9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-8-7
5. Each subordinated link may operate on different channel bandwidths, and/or
different frequency bands.
6. Each of the subordinated links operates as a normal link of that configuration.
7. Under dual protection only one link of the two subordinated links is sending
received data to the Node bus at one time.
8. With frequency diversity master protection both of the subordinated links are
online transmitting. Subordinated links (hot-standby / space diversity /
non-protected) must be configured on different frequency channels.
9. Dual protection switching is not hitless. Each of the two subordinated
protected links incorporate hitless (errorless) Rx switching in the normal way,
but the master switch between the two subordinated links is not hitless. Refer
to Dual Protection on page 3-76, Volume II Chapter 3, and to Service
Restoration Times for Dual Protection on page 3-98, Volume II, Chapter 3.
10. With a frequency diversity master switch it is possible to operate with Rx
from one protected link, and Tx to the other.
11. The frequency diversity master switch only controls the Rx:
• There is no Tx switch event (no muting of transmitters). Each of the two
subordinated links (hot-standby / space diversity / non-protected) remain
free to transmit (they cannot therefore share a frequency channel).
• The receive data stream is switched to what was its offline link to bring it
online sending to the backplane bus.
12. When two protected links are selected for dual protection (or protected with
non-protected) the secondary link will assume the circuit connections of the
primary link. Any circuit connections previously assigned to the secondary
link will be dropped.
13. When a dual protected link is returned to two separate protected links (or
protected link and a non-protected link), the circuit connections established
will stay with what was the primary link. There will be no circuit connections
assigned to what was the secondary link.
Additional Rules for 1+1 Ring Protection
1. 1+1 protection of a ring-protected link is normally implemented to provide
path protection as distinct from equipment protection. Therefore space
diversity (SD) is the required/recommended 1+1 protection mode
2
.
2. One, some or all links on the ring may be 1+1 protected.
2
Hot-standby can be configured, but unlike space diversity offers no protection against path fade events.
However, should ring 1+1 operation with hot-standby links be required, its CT configuration is identical
to space diversity.
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