Cisco ONS 15454 SDH Specifications Page 42

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 1 Hardware Installation
Rack Installation
Note The ONS 15454 SDH must have 40 mm of airspace below the installed shelf assembly to allow air
flow to the fan intake. If a second ONS 15454 SDH is installed above a shelf assembly, the air ramp
between the shelves provides the space for air flow. However, if the ONS 15454 SDH is installed
above third-party equipment, provide a minimum of 40 mm between the third-party unit and the
bottom of the ONS 15454 SDH. The third-party equipment must not generate heat upward into the
ONS 15454 SDH. The top of the third-party unit should be a non-combustible surface when an air
ramp is not installed between the ONS 15454 SDH and the third-party unit.
1.3.3.1 Three-Node Configuration
A single ONS 15454 SDH node can accommodate up to 120 DS-3/E-3 or 140 E1 drops. If you need to
drop more than the maximum allowed for a single node, you can link multiple nodes using a fiber-optic
bus. However, you cannot merge multiple nodes into a single ONS 15454 SDH. You can use STM-4,
STM-16, or STM-64 fiber spans to link the nodes as you would link any other network nodes. Nodes can
be co-located in a facility to aggregate local traffic.
Figure 1-4 shows a three-shelf node setup. Each shelf assembly is identified as a separate node in Cisco
Transport Controller (CTC), the ONS 15454 SDH software interface. Traffic must be mapped using CTC
cross-connect options. In the figure, each node uses redundant fiber-optic cards. Node 1 uses redundant
STM-N transport and STM-N bus cards for a total of four cards. Nodes 2 and 3 each use two redundant
STM-N bus cards for a total of four cards, with eight free slots remaining. The three-node example
presented here is one of many ways to set up a multiple-node configuration.
Figure 1-4 A three-node fiber-optic bus configuration
Redundant
STM-N Bus
STM-N Feed
Redundant
STM-N Bus
Up to 120 DS-3/E-3, 140 E1
Up to 120 DS-3/E-3, 140 E1
ONS 15454 SDH
ONS 15454 SDH
ONS 15454 SDH
Redundant
Up to 120 DS-3/E-3, 140 E1
61212
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