Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño

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AMP Champ Protection 
 
When you use AMP Champ connectors, the ONS 15454 supports 1:1 or 1:N protection for the 
DS-1 cards.  The DS1N-14 card can be a working or protect card in 1:1 or 1:N protection 
schemes.  When used with 1:N protection, the DS1N-14 card can protect up to five DS1-14 plug-
ins using the AMP Champ EIA. 
 

 
With 1+1 port-to-port protection, any number of ports on the protect card can be assigned to 
protect the corresponding ports on the working card.  The working and protect cards do not have 
to be placed side by side in the node.  A working card must be paired with a protect card of the 
same type and number of ports.  For example, a single-port OC12 must be paired with another 
single-port OC12, and a four-port OC12 must be paired with another four-port OC12.  You cannot 
create a 1+1 protection group if one card is single-port and the other is multi-port, even if the OC-
N rates are the same.  The protection takes place on the port level, any number of ports on the 
protect card can be assigned to protect the corresponding ports on the working card. 
 
For example, on a four-port card, you can assign one port as a protection port on the protect card 
(protecting the corresponding port on the working card) and leave three ports unprotected.  
Conversely, you can assign three ports as protection ports and leave one port unprotected. 
 
1+1 span protection can be either revertive or nonrevertive.  With nonrevertive 1+1 protection, 
when a failure occurs and the signal switches from the working card to the protect card, the signal 
stays switched to the protect card until it is manually switched back. Revertive 1+1 protection 
automatically switches the signal back to the working card when the working card comes back 
online. 
 
You create and modify protection schemes using CTC software.  For more information, refer to 
the Cisco ONS 15454 Procedure Guide. 
 

 
The Ethernet cards support IEEE 802.1D Spanning Tree Protocol (STP).  The ONS 15454 can 
operate multiple instances of STP to support VLANs in a looped topology.  You can dedicate 
separate circuits across the SONET ring for different VLAN groups.  Each circuit runs its own 
STP to maintain VLAN connectivity in a multi-ring environment. 
 
You can also disable or enable STP on a circuit-by-circuit basis on single-card EtherSwitch in a 
point-to-point configuration.  This feature allows customers to mix spanning tree protected circuits 
with unprotected circuits on the same card.  It also allows two single-card EtherSwitch Ethernet 
cards on the same node to form an intra-node circuit.