Evo™ XPAND IP / METRO LH is based on the common platform concept, a highly flexible scalable system, a multi-mode software-defined radio. The transceivers cover complete frequency bands, resulting in simpler deployment and fewer spare parts, which significantly reduces carrier’s operating costs. EvoTM XPAND IP/ METRO hardware is designed to work in both SDH (METRO) and all-IP/Ethernet (XPAND IP) modes, where a simple change of interfaces is required to achieve the desired configuration.
For networks requiring SDH, a terminal is configured with STM-1/ STM-4 interfaces and can be later converted to allow for Ethernet transport. When the network is ready for Ethernet transport, the STM-1 interfaces are simply replaced by the multi Gigabit Ethernet switch in XPAND IP. The system even allows to run two systems over the same branching system, with some channels transporting STM-1, while other channels transporting Native Ethernet.
Carriers are currently challenged with the requirement to provide highest possible capacities to support bandwidth-hungry IP services such as data and video. This means they have to work out migration strategies to satisfy user demands yet meeting budgetary expectations. EvoTM XPAND IP / METRO LH is a solution that meets carriers’ requirements by offering cost-cutting technology for easy migration to all-IP.
High capacity Long Haul systems are traditionally built with multiple 28, 40 and 56 MHz channels, where each channel carries one STM-1. Interface selection range from E1/E3 and GbE/ FE with the optional embedded X-connect, to STM-1 and STM-4. Although SDH allows transport of both TDM and Ethernet and is well proven and stable technology, the ever-increasing demand for bandwidth pushes the networks to evolve to all-IP/Native Ethernet.
Evo™ XPAND IP features the Multichannel Adaptive Bandwidth Control, the unique technology for traffic distribution over several RF carriers.
The Multichannel ABC dynamically adjusts the total link capacity depending on the number of channels and their available capacities to provide the highest throughput at any time. The traffic from the Ethernet WAN port is distributed to all available RF channels in a round robin fashion, independent of packet sizes and flows. This results in a single high-capacity Ethernet link, with a high level of resilience and efficiency. If an RF-channel fails, the overall throughput will drop, but the remaining capacity will be fully utilized.
The QoS scheduler ensures that high priority traffic is transmitted unaffected, while low priority traffic may be dropped if the link becomes congested.
In ACM mode, the radio will select the highest possible link capacity based on received signal quality. If the signal quality is degraded due to link fading or interference, the radio will change to a more robust modulation and link capacity is consequently reduced. When the signal quality improves, the modulation is automatically increased and link capacity is restored to the original setting. The capacity changes are hitless (without bit errors).
First with 2048 QAM: Evo Long Haul is first solution in the industry to offer 2048 QAM .
SDH employs n+1 protection, where one of the radio channels is a standby channel working as a protector for all the other channels. In a packet based network, the protection is part of the Multichannel ABC. When all channels are active and working, the entire transmission capacity is used for payload traffic. If a channel has degraded due to fading or failure, this channel is excluded from the distribution and the overall capacity is reduced.
The outstanding power efficiency of the EvoTM XPAND IP / METRO LH reduces the environmental footprint of the network. Substantial cost savings are achieved due to reduced energy cost and reduced cost of site infrastructure such as air-conditioners, batteries and solar panels.
The unique split-mount option makes the solution even more effective. By mounting the transceiver units outdoor in a low loss branching arrangement, the heat is removed from the building/ cabin and the reduced waveguide loss improves the system availability.
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