User's Manual

260-668066-003 Rev 002 October 2001 3-15
Eclipse Installation Manual
Protection Options
Eclipse supports link, interface, network, and platform protection options:
Link/Path Protection
Hot-standby, space diversity, frequency diversity, or dual protection options are
available. RACs and their companion IRU 600 are protectable.
Rx voting is hitless/errorless; Tx switching is not hitless. The maximum restoration
time for a Tx switch is 200 ms.
A remote Tx switch is forced in the event of a silent Tx failure.
Interface Protection
DS1, DS3 and OC3 interfaces can be hot-standby protected using paired (stacked)
DACs.
The protectable DACs are DAC 16x V2, DAC 3xDS3, DAC 3xDS3M, DAC 2x155o, DAC
2x155e, DAC 155oM.
When a switch occurs, all Tx and/or Rx tributaries are switched to the protection
partner.
Two protection configurations are supported, tributary protection, and always-on:
Tributary Protection
• Y cables connect the paired DACs to customer equipment.
• In the Rx direction (from the customer) both DACs receive data, but only the online
Rx DAC sends this data to the TDM bus.
• In the Tx direction, the online Tx DAC sends data to customer equipment, the other
mutes its Tx line interface.
Tributary Always-On
• Separate cables connect each DAC to customer equipment.
• In the Rx direction (from the customer) both DACs receive data, but only the online
Rx DAC sends this data to the TDM bus.
In the transmit direction both DACs send data to customer equipment, and the
customer equipment switches between these two
always-on tributaries.
Protection switching is not hitless. The maximum restoration time for a Tx or Rx trib
switch is 200 ms. Typical restoration times are between 80 ms and 120 ms.
Network/Data Protection
•RWPR
TM
supports fast-switched RSTP on Ethernet ring and mesh networks.
• Data redundancy is supported on Ethernet link-aggregated links.
• Super PDH ring operation supports protection on NxDS1 ring links.