ERMES
Paging System Digital European.
ESATA
External Serial Advanced Technology Attachment
Change equipment for external interface SataVersion serial ATA standard, or IDE (Integrated Drive Electronics), Designed for connecting internal motherboard the unit hard drives.
The eSata is presented as a competitor of peripheral interfaces for quick USB 2.0 FireWire.
The main advantage of the eSATA compared to USB 2.0, lies in the speed bandwidth. Indeed, USB 2.0 allows only flow theoretical maximum of 60 MB / sec while the eSata allows rates of up to 150 MB / sec or 300 MB / sec Mode eSataII.
The eSata should logically allow using external drives more robust without being limited by the bandwidth of USB 2.0 or FireWire standard.
The new operating eSata port and shielded cables specially designed for the use of external drives.
DCE
Equipment responsible for adapting the signal between a DTE and the network.
A DCE is not always a Modem.
Ethernet
Born in the early 1970s, Ethernet has gradually emerged as an essential technology in local networks, which it currently holds more than 90% market share. It connects workstations to Servers enterprises, campuses and institutions. The Gigabit Ethernet was first introduced in 1998. A year later she began to replace ATM as Protocol Level 2 on the distribution networks.
The computers a network with a suitable card, are connected after declination adopted Ethernet using coaxial cables, fiber optics or copper telephone wire.
Today, Ethernet connections in dedicated mode made the mechanism of collision avoidance obsolete, ten times the flow up a protocol for which new specifications have been standardized. So, the latest versions of Ethernet have great advantages, particularly at dorsal loops and metropolitan (MAN).
Among the major advantages of Ethernet technology, there are mainly:
* Encapsulation Protocol IP by Ethernet technology is well established since its widespread introduction in the local network environment.
* The technology is well understood by network administrators, who can manage their network WAN as a broad LAN Ethernet.
* It provides granular flow very fine Agenda megabit per second (Mbps). We can begin with an interface 100 Mbit / s and a flow rate of 10 Mbit / s, then gradually increase the speed of access as and when required.
The success of Ethernet is now an even closer complementarity between the technology and IP services on the one hand, and its effective adaptation in the Heart network. Supported including Cisco and Nortel, the standard 802.17 (RPR or Resilient Packet Ring) should be ratified in spring 2003. The technology of protection and restoration of links should give the Ethernet over fiber / DWDM robustness comparable to Sonet networks. It will help to optimize resources and ensure good Resilience fault.
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