AE1card presentation

1
AE1-card presentation
E1/T1 links for the AlphaCom exchange
2
Highlights

• Each AE1-card provides 2 E1/T1 high speed links
  to the exchange
• Interface for 7 serial ports, upto 38K4 baud
• 3 cards can be placed in an exchange
• 3 positions can be used for multi-module linking
• 2 positions can be used for AlphaNet
• Fractional multiplexer capabilities

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Primary use

• AlphaNet linking, replaces AGA cards, 32 audio
  links for each AE1-card are available
• Multi-module linking, replaces AGA cards, a
  maximum of 31 audio rings are available

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Modes of operation

• The AE1 card can be used in the following modes
• E1 (mainly used in Europe, uses 120 Ohm cabling
  as specified for E1)
• T1 (mainly used in The USA, uses 100 Ohm cabling
  as specified for T1)
• E1CAT5 (the same operation mode as E1, but with
  an impedance matching CAT5 cabling as used in
  many buildings)
• Optional parameters for differentsub-parts of
  the specification

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Multi-module configuration

• 31 audio rings in E1 mode, 24 in T1 mode, no data
• With data, maximum 2 time slots are used for the
  data
• Only 4 wires between modules

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AE1 as multiplexer

• Customers may have an existing E1/T1 link with
  spare capacity
• This link can be broken and the AE1-card can be
  inserted
• The AE1-card passes the existing traffic through
  while inserting its own audio and data on the
  spare timeslots
• This is Fractional E1/T1

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AlphaNet

• Audio and data on the same E1/T1 link
• Direct audio and data links between node 1 and N
  are possible, nodes in between do not need to act
  as transit exchange due to multiplexing
  capability of the AE1,Fractional E1/T1

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AlphaNet with multiplexers

• If required it is possible to use external
  multiplexers as well

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Filter card

• For the AlphaCom and AlphaCom 80 there is a new
  filter card FBE1 which has 2 RJ45 sockets for the
  E1/T1 links
• The card is delivered with an Octopus-cable
• The console and 3 general purpose ports are
  terminated

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AlphaCom M backplane

• For the AlphaCom M there is a new backplane
• AE1 related changes
• 1 additional RCO connector related to card
  position 2

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Exchange requirements

• AMC must have software 9.01 or higher
• AlphaCom M must have the new backplane

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Transmission (1)

• E1/T1 is point-to-point by nature multidrop,
  drop and insert are multiplexer capabilities
  which the AE1 provides
• E1/T1 has a 4-wire interface
• Direct back-to-back connection is possible up to
  a distance of 1 km
• Any transmission equipment with an E1/T1
  interface can be used
• HDSL (High bit rate Digital Subscriber Line)
  modems
• Fiber optic equipment
• Wireless

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Transmission (2)

• With repeaters it is possible to extend distances
• E1/T1 interfaces can be directly connected to
  networks of telecom companies who have the means
  of transporting the signals world-wide
• ATM
• E1 over IP

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HDSL modems

• HDSL modems can be connected back-to-back via 1,
  2 or 3 pairs
• 1 pair full 2 Mbit/sec on the pair 3 km (2
  miles)
• 2 pairs 1 Mbit/sec on each pair, longer distance
• 3 pairs 700 kbit/sec on each pair, even longer
  distance 8-9 km (5 miles)
• Distances depend on wire diameter, 18AWG ? 14 km
  (3 pair)
• Best so far 1 pair, 24 AWG, 5.3km (3.3 miles)
  or 3.7 miles _at_ T1 speed

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Fibre optics

• The distance which can be spanned via fibre
  depends on a number of parameters
• Fibre type Multi-mode (short distance) or
  Mono-mode (long distance)
• Wavelength of the light 850 nm (short distance),
  1300 nm (longer distance) or 1550 nm (even
  longer)
• Attenuation through the fibre (impurities)
• 850nm, multi-mode fibre 3 km
• 1550nm, mono-mode fibre 80 km

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Technical notes

• E1 provides 31 freely usable timeslots, T1
  provides 24
• When connecting the exchanges directly back to
  back E1-mode is advised as it provides 7 more
  timeslots than T1
• In other cases the mode depends on the
  transmission network which will be used (T1 in
  US, E1 in most other countries)
• Audio coding is G.711, telephone quality

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Benefits

• In an AlphaNet, a single AE1 has the same
  capacity as 5 AGA-cards
• One AE1 is cheaper than 2 AGA-cards
• Only 4 wires are required for interconnecting
  AE1s, compared to 48 wires for 2 AGA-cards and
  120 wires for 5 AGA-cards
• In a multimodule configuration a single AE1 in
  each module provides a minimum of 29 audio rings
• 3 AGA cards are necessary for 24 audiorings

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Applications (1)

• AlphaNetusingIPMuxfrom RADDirectconnections
  betweenexchangesusing an IP-network

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Applications (2)

• AlphaNet on an ATM-network, or any other type of
  network using the E1-interface
• Transport of (fractional) E1 by the network
  provider

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Applications (3)

• An AlphaNet linkbetween 2 exchangeswhere the
  distanceis too far for a directconnection
  betweenthe AE1-cards (gt 1 km)
• HDSL modem
• Fiber optic cable

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Comparison with Commend (1)

• The G7-CNET-E1 has a single E1 connection which
  must be connected point-to-point to another
  exchange
• A Commend exchange can be connected to 4 other
  exchanges via E1, but that exchange must house 4x
  G7-CNET-E1
• There is in that case only space for 8 subscriber
  cards (32 subscribers)
• Audio and data links use pre-defined timeslots
• 8 time slots for internal data
• Maximum 10 conversations(20 timeslots)

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Comparison with Commend (2)

• The points on the previous slide make it
  impossible to share an E1-link with some spare
  capacity with other systems
• The AE1 can use an existing link with some spare
  timeslots to link exchanges
• Only 2 free timeslots are required as a minimum
  to link 2 exchanges, 1 audio 1 data
• A single E1-port of an AE1-card can provide
  direct links to 7 other exchanges
• All the above advantages are due to the
  fractional multiplexing capabilities ofthe AE1