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

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Two-fiber OC-48 or OC-192 BLSRs can be converted to four-fiber BLSRs.  To convert the BLSR, 
install two OC-48 or OC-192 cards at each two-fiber BLSR node, then log into CTC and convert 
each node from two-fiber to four-fiber.  The fibers that were divided into working and protect 
bandwidths for the two-fiber BLSR are now fully allocated for working BLSR traffic.  See the Cisco 
ONS 15454 Procedure Guide

 for BLSR conversion procedures. 

 

 
The ONS 15454 provides the flexibility required to link remote offices to a central office (CO) and 
to aggregate a wide range of services at the edge of the network and transport them to the core 
of the network. 
 

 
The unidirectional ring is the simplest TDM ring architecture to implement and has become the 
access ring architecture of choice.  A Path Protection Configuration circuit requires two DCC-
provisioned optical spans per ONS 15454 node.  In the case of a fiber cut or signal degradation, 
the ONS 15454 initiates a receive-end switch on the individual traffic path, restoring service very 
quickly.  Since each traffic path is transported around the entire ring, the unidirectional ring 
architecture is optimized for networks where traffic homes to one or two locations.  The capacity 
of the ring is equal to its bit rate since all traffic returns to one hub location. 
 
Path Protection Configuration functionality is available on the OC-3, OC-12, OC-48 and OC-192 
port cards.  Figure 9-7 shows a common Path Protection Configuration application.  OC-3 optics 
provide remote switch connectivity to a host Telcordia TR-303 switch.  In the example, each 
remote switch requires eight DS-1s to return to the host switch.  Figure 9-8 and Figure 9-9 show 
the shelf layout for each ONS 15454 node.