Comparing EoSDH with Cost effective Wireless Ethernet Bridges
This article will make an effort to discuss comparative satanding of EoSDH transmission solutions versus employment of cost effective PTP WiMAX Ethernet Links. Article focuses on environments where optical transmission solution is not feasible.
Network service providers and large enterprises, While extending their operations in difficult geographical terrains are faced with challenge of selecting a right transmission technology for their WAN links. Options include evolved Next genration SDH
solutions vs cost effective PTP WiMAX Ethernet Links. While making a right choice for a backbone transport technology, we must first bear in mind some key features for any Backbone Transport System : PTP WiMAX Ethernet Links like AN-80i is the public network wirelessbackhaul equipment from RedLine Communications RedConnex productfamily. The AN-80i enables organizations such as schools, hospitals, utilitiesas well as service providers to solve the middle mile challenge and deploycost effective reliable connections in even the most challenging conditions. AN-80i supports up to 108 Mbps (uncodedburst rate), translated up to 90 Mbps Ethernet rate in halfduplex fashion. By employing dynamictime division duplex (TDD) a max of 45 Mbps Full-Duplex data rates arepossible. AN-80i works on adaptive modulation and coding schemes and allows for the scheme to change on aburst-by-burst basis per link, depending on channel conditions. Adaptivemodulation and coding significantly increases the overall system capacity, howeverthis results in real-time trade-off between throughput and robustness on eachlink. Such adaptive feature may be desirable / suitable for backhaul links butsame is not true for backbone of a core network being used to transport multiple real time services. AN-80i meant for “Backhaul Links”. Manufacturers of network switching equipment use the term “Backhaul”to mean "getting data to the network backbone", e.g. similar to getting data of a remoteBTS to city BSC. AN-80i are meant to be cost effective wireless backhaul links.Thus AN-80i may be a cost-effective solution, in scenarios where satellitelocations may be needed to hook on the core network and specially extension ofcore network to remote locations, but as discussed above, using standardEthernet bridges like AN-80i will not be feasible solution for employment on main links catering as a backbone for a sizeable portion of network. In comparison traditionally microwave based SDH systems from vendors like, Nera, Siemens and Huawei is other option with merits but costly. These systems have also evolved with time to Next Generation SDH, affording ubiquitious Ethernet services. Following are few of the key advantages associated when employing EoSDH: Carrier grade reliability and resilience. Sub 50 msec protection switching and performance monitoring. Superior and proven features to work reliably in adverse weather conditions like space diversity and dual FEC. Huge deployed base. Bandwidth on demand features using LCAS and VC. Quality of Service (QoS) enabling tiered Service Level Agreements (SLAs) on per application basis. Dynamic Load Balancing/Dynamic Route Optimization. Carrier Grade Fault Recovery Mechanism.
Concluding ThoughtsConsidering superior carrier grade features of EoSDH while cost effective nature ofmicrowave Ethernet bridges, both have their market segments and utilization scenarios. A possible mix could be use of EoSDH at main links, whereas suitable microwave Ethernet bridges may be utilized for backhauling traffic from remote locations and isolated customer pockets. |
