Ring Protection - Alcatel-Lucent 9500 MXC User Manual

Ring Protection

3DB 23063 ADAA - Rev 004 July 2007
Dual Diversity (Frequency over Space) Tx and Rx Partnering
Figure 3-46.
• Each of the subordinated links are first configured for the protection option
required and both must be configured for the same capacity. Subsequently the
dual (master) switch protection is applied.
• Normally all RACs would be of the same type (RAC 30 or RAC 3X) but while
each of the subordinated protected links must have the same RACs one
protected pair may use RAC 30s, the other RAC 3Xs.
• Each subordinated link may operate on different channel bandwidths, and/or
different frequency bands.
• Each of the subordinated links operates as a normal link of that configuration
and under dual protection only one link of the two is sending received data to
the INUe backplane bus at one time.
• With frequency diversity master protection both subordinated links are online
transmitting. Subordinated links (hot-standby / space diversity / non-protected)
must be configured on different frequency channels.
• With a frequency diversity master switch it is possible to operate with Rx from
one protected link, and Tx to the other.
• Dual protection master switching is not hitless. Each of the two subordinated
protected links incorporate hitless (errorless) Rx path switching in the normal
way, but the master switch between the two subordinated links is not hitless.
Refer to Service Restoration Times for Dual Protection.
• For more information refer to Additional Rules for Dual Protection in 9500
MXC CT Volume IV, Chapter 8.
9500 MXC directly supports ring protection of NxE1 or NxDS1 traffic.
9500 MXC does not support E3/DS3 or STM1/OC3 rings. Where ring protection
of such rates is required, an external add/drop mux is required.
9500 MXC directly supports RSTP protection of Ethernet traffic in ring and
mesh networks using the DAC GE GigE plug-in.
9500 MXC User Manual
Vol. II-3-77