Knowledge in one place.
By Michel de Freitas Caldeira – Pre-Sales Analyst
The unavailability of redundancy of optical ring links ends up increasing the operating costs of the internet provider/operator. To avoid interruption of services, emergency displacements or even activation of the teams on duty, Datacom has in its portfolio the DM962-OPU, DM964-OPU and DM962-OPU-C optical switches for protection of optical rings. Optical switches promote the by-pass (bypass) of the link element in the event of a power outage, thus ensuring the continuity of the optical ring's redundancy, thus keeping the other services active and protected.
In this article, we will demonstrate how to apply a ring topology using a DM962-OPU, DM964-OPU and DM962-OPU-C optical switch.
1 – Products
The DM962-OPU and DM962-OPU-C are functionally focused on one-fiber bidirectional ring links, while the DM964-OPU is functionally focused on two-fiber unidirectional ring links.
The DM962-OPU and DM964-OPU feature SC/UPC single-mode connectors, full range AC/DC power supply, compact dimensions for 19-inch RACK installation at 1U height.
Main features:
The DM962-OPU-C features SC/UPC single-mode connectors, full range AC power supply, compact dimensions for 19-inch RACK installation at 1U height.
Main features:
2 – Topology
The DM962-OPU or DM962-OPU-C must be installed together with the equipment corresponding to the optical ring node to be bypassed in case of failure. The diagram below indicates the topology adopted considering rings of a fiber (bidirectional), that is, with different wavelengths.
Figure 4. Ring Installation of a Fiber Using DM962-OPU-C
The DM964-OPU must be installed next to the equipment corresponding to the optical ring node to be bypassed in case of failure. The diagram below indicates the topology adopted considering rings of two fibers (unidirectional), that is, each fiber will adopt a traffic direction between the equipment.
Figure 5. Two Fiber Ring Installation Using DM964-OPU
3 – Operation
The figure below illustrates a situation where six devices belonging to a bidirectional ring are equipped with the DM962-OPU-C optical switch. In a no-fail situation, the DM962-OPU-C optical switch directs traffic to the ring element to which it is connected via the CLIENT ports.
Distances:
Figure 6. Ring topology of a fiber using DM962-OPU-C without failure
To determine the range of transceivers used in client equipment, the drop (by-pass) of at least one neighboring client must be taken into account. When there is a by-pass in the network, the distance between two adjacent active nodes will increase and the attenuation introduced by the additional length of optical fiber needs to be met, that is, the distances will be added.
Figure 7. Ring topology of a fiber using failed DM962-OPU-C
By-pass switching occurs due to power failure!
In our example with the occurrence of a power failure in “LINK A” after the DM962-OPU-C has made a BY-PASS link, we started to consider a total distance of 20km between the “DATACENTER” and “LINK B”, making so that the data traffic is switched to the BY-PASS link ensuring the continuity of the ring redundancy. Returning the power to the “LINK A” the ring will have the main protection.
Two Fiber Ring Topology using DM964-OPU only differs in installation as shown in Figure 5, protection processes and mechanisms will be the same.
The use of an optical key is a solution that adds security to the legacy network and the new IP networks, which includes numerous advantages for our customers, as it combines service quality, CAPEX reduction and high availability and protection of services.
If you have any questions about this procedure, you can contact the Datacom technical support team through our DmSupport self-service portal or through the call center (+55) 51 3933 3122.
In addition to the optical key solution presented, Datacom has a large portfolio of Ethernet Switches, GPON, Routers, Servers, Network Management, among others.
If you have questions about applications, do not hesitate to contact our support suporte.prevendas@datacom.com.br. You can request the description of the equipment presented in this article or ask for our help in choosing the most suitable product for your needs.
For questions and request for a proposal, do not hesitate to contact Datacom's commercial team: sales@datacom.com.br, via whatsapp account managers or (+55) 51 3933 3000.
