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Supported Network Configurations

 

This topic describes and illustrates the various network configurations you can build with the TCX Series Optical Transport System.

Linear Multi-Span Multi-Access Network

Figure 1 shows a five node linear multi-span, multi-access network configuration. In addition, a seven node configuration is shown that has two endpoints, which form a dual-homed configuration that is sometimes known as a horseshoe configuration.

Figure 1: Linear Multi-Span Multi-Access Network and Horseshoe Network Configuration
Linear Multi-Span Multi-Access
Network and Horseshoe Network Configuration

This network configuration uses the following:

  • Each end node (A & E) is a single TCX1000-RDM20, 1-degree ROADM node.

  • Middle nodes (B, C, D) consist of two TCX1000-RDM20s, which form a 2-degree ROADM node interconnected by fiber cables for passing channels to/from degrees.

  • Line ports (duplex) connect to system fiber pairs.

  • Pass-through fiber connections at 2-degree (middle) sites (B, C, D) uses universal ports.

  • Transceivers can be directly connected the Ux ports on the TCX1000-RDM20 or can be connected to an optical multiplexer, which in-turn connects to a universal port on the TCX1000-RDM20.

Linear Multi-Span with Spurs

In Figure 2 is a linear multi-span network with spurs.

Figure 2: Linear Multi-Span with Spurs
Linear Multi-Span with Spurs

This network configuration uses the following:

  • 1-degree sites (A,E,F,H) are formed with a single TCX1000-RDM20 at each end node.

  • 2-degree sites (D,G) are formed with 2 x TCX1000-RDM20 at each pass-through node.

  • 3-degree sites (B,C) are formed with 3 x TCX1000-RDM20 at each spur node.

  • Line ports (duplex) are connected to system fiber pairs.

  • Transceivers can be directly connected the Ux ports on the TCX1000-RDM20 or can be connected to an optical multiplexer, which in-turn connects to a universal port on the TCX1000-RDM20.

Horseshoe with Spur

In Figure 3 is a linear horseshoe network configuration with dual homed hub sites (A and E).

Figure 3: Horseshoe with Spur
Horseshoe with Spur

This network configuration uses the following:

  • Sites B, C, D have redundant paths (and equipment) for connectivity to ROADM nodes A and E.

  • Site F has a shared risk path between ROADM nodes F and D. Connection can then be optically switched by the ROADM node at D to either direction from nodes D to A and E.

  • Protected sites (B,C,D) are preferred because they provide the most resilient connection.

  • Sites with shared risk paths (F) are supported, but provide a less capable solution. However they may be used to collect additional traffic on to the network where limited fiber routes are available. If path from F to E is available it is the preferred path to extend horseshoe path.

Ring

In Figure 4 is a ring network configuration.

Figure 4: Ring Network
Ring Network

A ring network is composed of many 2-degree ROADM nodes. This example ring network configuration uses the following:

  • All 2-degree sites (A,B,C,D,E) are formed with 2 x TCX1000-RDM20 at each pass-through node.

  • Line ports (duplex) connected to system fiber pairs.

  • Path forms closed optical ring.

  • Transceivers can be directly connected the Ux ports on the TCX1000-RDM20 or can be connected to an optical multiplexer, which in-turn connects to a universal port on the TCX1000-RDM20.

Ring Interconnect

In Figure 5 is a ring interconnect network configuration.

Figure 5: Ring Interconnect Network
Ring Interconnect Network

This network configuration uses the following:

  • 2-degree sites (A,B,C,E,F,G) are formed with 2 x TCX1000-RDM20 at each pass-through node.

  • 4-degree site (D) at ring interconnect is formed with 4 x TCX1000-RDM20.

  • Line ports (duplex) connect to system fiber pairs.

  • The 4-degree site (D) allows traffic to be switched from one ring to another.

  • Transceivers can be directly connected the Ux ports on the TCX1000-RDM20 or can be connected to an optical multiplexer, which in-turn connects to a universal port on the TCX1000-RDM20.

Mesh

The mesh network in Figure 6 combines characteristics of all previous network configurations.

Figure 6: Mesh Example 1
Mesh Example 1

This network configuration uses the following:

  • 1-degree site (H) is formed with a single TCX1000-RDM20

  • 2-degree site (G) is formed with 2 x TCX1000-RDM20

  • 3-degree sites (B,C) are formed with 3 x TCX1000-RDM20

  • 4-degree sites (A,D, E) are formed with 4 x TCX1000-RDM20

  • 5-degree site (F) is formed with 5 x TCX1000-RDM20

  • Sites up to 20-degrees are supported by the TCX1000-RDM20

  • Line ports (duplex) connect to system fiber pairs

  • Transceivers can be directly connected the Ux ports on the TCX1000-RDM20 or can be connected to an optical multiplexer, which in-turn connects to a universal port on the TCX1000-RDM20.

Figure 7 shows a high resilience mesh network configuration.

Figure 7: Mesh Example 2
Mesh Example 2

This network configuration is highly resilient to multiple failures—each site has three independent paths to any other site:

  • 3-degree sites (A,B,C,D,E,F,G,H) are formed with 3 x TCX1000-RDM20

  • 8-degree site (J) is formed with 8 x TCX1000-RDM20

  • Sites up to 20-degrees are supported by the TCX1000-RDM20

  • Line ports (duplex) connect to system fiber pairs

  • Transceivers can be directly connected the Ux ports on the TCX1000-RDM20 or can be connected to an optical multiplexer, which in-turn connects to a universal port on the TCX1000-RDM20.