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EBONE Boundary System Technical Specification
Stockholm, April 25, 1992.
Abstract
The goal is to implement, and put into production, a shared
infrastructure for open architecture protocols in Europe.
EBONE supports two architectures, "OSI" and "TCP/IP" and
this document describes the way of establish a Ebone Boundary
System (EBS). For EBONE-92 the proposed requirements should
be interpreted as recommendations.
CONTENT
1. Technical specification and Implementation
1.1 Environment
1.1.1 Power
1.1.2 Aircondition/Cooling
1.1.3 Fire protection
1.1.4 Physical security
1.2 The EBS router
1.2.1 Mounting
1.2.2 Physical interfaces
1. Technical Specification and Implementation.
1.1. Environment.
The goal with EBONE is to provide a production stable networking
infrastructure within Europe. As we all know, no chain is stronger
than its weakest link. The EBONE systems has to be put in a
'friendly' (for this kind of equipment) environment.
1.1.1. Power.
The primary power feeder for the entire EBONE system (including all
external components such as terminals and other systems in direct
communication like transmission equipments) should be unique to the
EBONE system. Therefore, power for all components should be derived
from the same power distribution panel. All equipments must be
grounded to the same single point.
If, for any reason, this cannot be implemented, provide special
signal interference handling whenever a communication path goes
between two devices powered from different feeders. Special signal
interface handling may include opto-isolation, or any means which
maintains logic reference isolation between the communicating
components.
The EBONE system shall be powered from uninterruptable power source
(UPS), this system provides the greatest degree of power regularity
and power line isolation. An UPS is a source of ac power not
effected by fluctuations in commercial power, and therefore guards
the connected system against even momentary voltage disturbances.
The UPS system shall be able to support the EBS for not less than a
120 minute outage of commercial power.
It shall also be possible to bypass the UPS and remove it for
maintenance without the need of interrupt the EBS.
The current drained through a fuse shall be less than 50% of the
rated value.
1.1.2. Air Conditioning and Cooling Recommendations.
The room that houses the EBS needs sufficient air conditioner,
effective enough to meet the environmental specification for both
the hottest and coldest day of the year.
The air conditioner shall have at least two separate circuits. In
case of multiple circuits, make sure that there is a spare circuit.
Some buildings have centralized water cooling systems. If such a
system is used make sure that the building has enough emergency
backup, or arrange for an alternate source of cooling water.
Make sure that, in case of a fallback to UPS power, that cooling
capacity is provided through UPS power that the equipment does not
'fry' itself.
Recommended environmental specifications.
Temperature 21 C
Relative humidity 50%
Dew point 10 C
Recommended control tolerance:
Temperature 18 C to 24 C
Relative humidity 40% to 60%
Temperature rate of change 3 C/hr
Humidity rate of change 6%/hr
1.1.3. Fire protection.
As the rules are different from country to country, no general rules
could be set. A non-destructive extinguishing system is preferred.
Examples of non-destructive extinguishing system are carbon dioxide
and bromotriflouromethane (halon 1301).
1.1.4. Physical security.
The area surrounding the EBS shall provide such physical protection
that it is unlikely that it may be sabotaged or manipulated by
unauthorized personnel.
1.2. The EBS router.
As EBS, a router with at least 4 Megabyte of RAM is needed. At the
time of the writing a good example is an CISCO AGS+. The router
should be configured with a maximum of 16 serial interfaces.
A general opinion is to have only serial interfaces attached to the
EBS if possible. A rule of thumb here is to try to group links to
RBS systems having much traffic between them on the same interface
board, using 4 port serial circuit cards to offload the backplane
bus if possible.
By definition, a EBS has two international links, and they shall, as
far as possible, be routed in separated paths from the EBS. Try to
avoid shared resources like cross-connects, multiplexors, telecom
cables, G703-704/V35 converters etc.
EBONE EBONE
! !
---------------------------------
! BANDWIDTH MANAGEMENT !
! !
! BACKBONE TRAFFIC ROUTING ! <- EBS
! !
! ROUTING TO/FROM THE REGION !
---------------------------------
! <- EBONE Boundary Interface
=========================================================================
! !
--------------------------------- ---------------------------------
! ACCESS (AND CONTROL) TO/FROM ! ! ACCESS (AND CONTROL) TO/FROM !
! THE BACKBONE SERVICES ! RBS ! THE BACKBONE SERVICES !
! ! ! !
! REGIONAL TRAFFIC ROUTING ! ! REGIONAL TRAFFIC ROUTING !
--------------------------------- ---------------------------------
! !
REGIONAL NETWORK REGIONAL NETWORK
FIGURE 1.
1.2.1. Mounting.
The EBS router shall be installed in a 19-inch cabinet which have
both front and back doors that can be closed. There shall be enough
air-flow through the cabinet to take away all the heat produced by
the housed equipment with the doors closed.
As much as possible of the needed equipment should be placed into
the same rack. If there are RBS systems at the same location they
may be placed in the same cabinet.
The goal is to make the EBS system as compact as possible to
minimize the risk of interruptions caused by accident while working
on other equipment housed in the same location.
1.2.2. Physical interfaces.
Below list is EBS accepted interfaces:
- V.35 or HSSI with PPP (RFC 1171) encapsulation.
- Ethernet (AUI Male Port provided by the EBS)
- FDDI (Dual Attachment).
- Frame Relay (CCITT I.122)
- RS.449
- X.21
Depending on speed and local conditions the WAN links may be
delivered either as V.35 or G703, in the case of G703 (G704) the
appropriate converters to V.35 must be provided.
EBONE-92 assumes "clear channel service" point-to-point links for
its implementation. Future networks may use some kind of "level 2"
WAN service.
Regarding Frame Realy it shall be noted that:
a) The EBONE will only connect regions. It will not serve local sites
or end users. The EBONE organization shall decide how the term
"region" should be interpreted in uncertain cases.
b) If the Frame Relay induces overload in an EBS router, the
acceptance of Frame Relay will be reconsidered. The EBONE
organization will decide on what shall be regarded as overload in
EBS routers.