Best Practices for Using the TCX1000-ILA in Linear Multi-Span, Ring and Mesh Networks
You can use the TCX1000-ILA in point-to-point, linear multi-span, ring and mesh networks. This topic describes the best practices for using the TCX1000-ILA in these networks.
When planning your network, take into consideration whether sites will or will not require traffic access. If you know that a site will never require traffic access, deploy the TCX1000-ILA as a lower cost solution. However, if you know that in the future, the site will require traffic access, the best solution is to deploy a ROADM node (with a minimum of two TCX1000-RDM20 devices for two directional traffic). This strategy enables you to implement the future traffic access without disrupting traffic in your network. If you choose to upgrade from a TCX1000-ILA to a TCX1000-RDM20 in the future, be aware that this hardware change will be service disruptive to traffic in your network.
We recommend no more than four TCX1000-ILA amplifiers be cascaded between two ROADM nodes.
TCX1000-ILA in Linear Multi-Span Networks
You can use the TCX1000-ILA in linear multi-span point-to-point networks. Although you can create multi-span point-to-point networks using all ROADM nodes, if there is no requirement to add or drop traffic at a node, a lower cost and higher performance solution is to use a dedicated inline amplifier (TCX1000-ILA) for this boosting application. The TCX1000-ILA provides lower noise amplification than the ROADM nodes, therefore it improves the OSNR and the reach of the optical network. However, by design, the TCX1000-ILA does not provide the spectral equalization capability that is delivered by the ROADM node and so transmission power disparity across the WDM wavelength complement can accumulate through the network. As a result, we recommend no more than four TCX1000-ILA amplifiers be cascaded in the amplifier chain between two ROADM nodes. The optical signal is re-equalized at the ROADM pass-through node and then additional amplifier sites can be used in the path. This ROADM node with TCX1000-ILA configuration is illustrated in the Figure 1 and Figure 2 below.
The first example in Figure 1 shows a single TCX1000-ILA site between ROADM Terminals to increase the network reach (note that there is no add/drop at the TCX1000-ILA site).
The second example in Figure 2 shows a TCX1000-ILA cascade with an equalizing ROADM node in line.
TCX1000-ILA in Ring and Mesh Networks
You can use the same reduced-cost TCX1000-ILA design placement when creating ring and mesh networks where traffic access is not required as the example shown in Figure 3 shows.