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GRNET Power users Connection


GRNET network architecture and technologies allow for upgrades and expansion of the provided services. The new services are based on optical dark fiber infrastructure, DWDM equipment and NG-SDH switching circuits, and they are fully available to GRNET Power users.

Power users are considered the Institutions that:

  • interconnect to the physical layer through dark fiber with a GRNET Point of Presence
  • may have documented need for IP interconnection to GRNET, higher than 1Gbps
  • may have documented need to interconnect via dedicated 1Gbps circuits (Ethernet framing) to another GRNET peer (eg Grid node) or other endpoint that is accessible to GRNET through GEANT2 pan-European network,
  • may have documented need to interconnect via dedicated optical path to another GRNET peer (eg Grid node)

GRNET network allows for upgrading the provided IP interconnection services for Power Users at speeds of up to 10 Gbps, while making it possible to provide additional dedicated circuit services at lower IP levels. The additional services are:

IP+ Service: IP interconnection at speeds up to 10 Gbps

Upgrading IP interconnection services to GRNET Power users at speeds of more than 1Gbps

This service is essentially upgrading IP interconnection services to GRNET Power users at speeds of more than 1Gbps. Its provision requires the installation of a router or switch with port 10 GE by the peer.

The service facilitates the interconnection of the User’s terminal router or switch to a GRNET backbone router at speeds of up to 10Gbps, for routing IP packages. The interconnection for each User is implemented by a dedicated optical wavelength (lambda) of 10Gbps capacity which carries the traffic of the carrier with Ethernet framing from its point of presence to the GRNET assembly switch over GRNET network. The aggregated IP+ traffic of the Users is transferred from the assembly switch to the main GRNET router and then routed to the rest of the network.

Although theoretically the IP+ service allows the IP interconnection at speeds up to 10Gbps, the guaranteed minimum connection speed is specified by the available infrastructure for the delivery of aggregated IP+ traffic of the Users to the GRNET central router. Initially, the Users will share aggregated IP of 10Gbps capacity. The implementation of the service does not involve the use of active equipment from a third peer. The IP+ service is provided with no protection; it is only available using a dedicated wavelength. For security reasons ,the peers can maintain their existing (1Gbps) access line.

Θα πρέπει να διευκρινιστεί στο σημείο αυτό ότι, παρ’ όλο που θεωρητικά η υπηρεσία IP+ επιτρέπει την IP διασύνδεση ενός ΦΠΠ με ταχύτητα μέχρι 10Gbps, η ελάχιστη εγγυημένη ταχύτητα διασύνδεσης κάθε ΦΠΠ που συμμετέχει στην υπηρεσία καθορίζεται σε κάθε χρονική περίοδο από τη διαθέσιμη υποδομή για την διοχέτευση της συναθροισμένης IP+ κίνησης των ΦΠΠ προς τον κεντρικό δρομολογητή του ΕΔΕΤ3. Σε πρώτη φάση, οι ΦΠΠ θα διαμοιράζονται συναθροισμένη IP χωρητικότητα 10Gbps. Είναι επίσης σημαντικό στο σημείο αυτό να τονιστεί ότι για την υλοποίηση της υπηρεσίας δεν μεσολαβεί ενεργός εξοπλισμός τρίτου οργανισμού. Η υπηρεσία IP+ παρέχεται χωρίς προστασία, δηλαδή παρέχεται χρησιμοποιώντας μόνο ένα αφιερωμένο μήκος κύματος. Για λόγους προστασίας, οι φορείς μπορούν να διατηρήσουν την υφιστάμενη (1Gbps) γραμμή πρόσβασης.

EPL Service

Provision of dedicated circuits with Ethernet framing.

EPL is a service of dedicated circuit switching of NxVC-4(0 <N = <7, where VC-4 = 149,76 Mbps, Ethernet framing) speed among Power Users (that host e.g. Grid nodes ) or between a Power User and another endpoint that is accessible for GRNET via the GÉANT pan-European network . The implementation of these circuits, if the required infrastructure is available, can be done almost in real time.

Requirements for Power Users

In order to be provided with this service, a Power User should:

  1. host a Point of Presence of the optical level of GRNET (valid for Power Users located in Athens and Thessaloniki MAN, or
  2. install WDM infrastructure that supports the transmission of more than one optical wavelengths between the peer and the nearest Point of Presence of GRNET

In the latter case, providing service support for Power Users requires the installation of equipment in addition to the GRNET infrastructure, with extra cost.

Technical description

GRNET network comprises four NG-SDH switches at its nodes in Athens (Koletti), Thessaloniki, Patras and Heraklion, which are interconnected via dedicated optical wavelengths at speeds of 10Gbps.

Power Users are given access to a 1GE client port at the relevant GRNET node hosting a NG-SDH switch. The EPL circuit implementation to a 1GE client port in NG-SDH switch is achieved over dedicated optical wavelength at the optical MAN [case (1)] or over the WDM infrastructure [case (2)].

Provided that necessary infrastructure is established [especially in case (ii)] and 1GE client port to NG-SDH switch is available, the service may be provided on demand in almost real-time with circuit implementation of the NG-SDH switches management system.

EPL circuits have a limited duration to be agreed each time with the involved Power User.

Lightpaths Service: Provision of dedicated optical paths

Establishment of dedicated optical path (lightpath).

The service is about the establishment of dedicated optical path (lightpath) at speed of 1/10Gbps between two Power Users using optical wavelengths. It is aimed at peers documenting the need to exchange traffic in long-term basis bypassing the IP infrastructure of GRNET.

Requirements for Power Users

In tandem with the EPL service, the service can be provided if:

  • the Power User hosts a point of presence of the optical level of GRNET (valid for Power Users located in Athens and Thessaloniki MAN) or
  • a  WDM infrastructure is installed, which will support the transmission of more than one optical wavelengths between the peer and the nearest GRNET point of presence

Technical description

The service allows direct (end to end) interconnection of two Power Users at 1Gbps or 10Gbps speed using optical wavelengths over the DWDM optical infrastructure of GRNET.

Protection to the optical wavelengths that provide the service between the two peers is not provided.

The provision of an optical path requires at least two weeks of preparation provided that there is optical equipment (eg, transponders) available.

Given the complexity and cost of the service, the necessity for its provision should be documented for a sufficient time period that cannot be less than a month. Since in some cases the transfer of wavelengths of 1 Gbps capacity over the backbone network is very expensive, the alternative of the EPL service implementation in such cases should be exhausted.