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Fabric Architecture comparison

SS Fabric MS Matrix Brcast matrix TDM Bus

Fabric blocking probability Zero Medium Zero Zero

Cell replication complexity Fair High Low Low

Scalability (fabric speed) Good Fair Fair Poor

Scalability (number of ports) Poor Good Fair Poor

Buffering in fabric Likely Required Likely Unlikely

Input buffering No Possible Possible No

Cost to produce Low Medium High Low

SS = Single-Stage

MS = Multi-Stage

Brcast = Broadcast

Page 16: Asynchronous Transfer Mode (ATM) Switch Technology and Vendor ...

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Call Control Comparison

Central Distributed

Robustness D A

Distance scalability D A

Network size scalability D A

Connection setup speed D A

Fault recovery speed D A

Information exchange complexity A D

Cost per switch A D

A = Advantage

D = Disadvantage

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SONET & SDH Frame Formats

SONET SDH Mb/s

OC-1 / STS-1 n/a 51.84

OC-3 / STS-3 STM-1 155.52

OC-12 / STS-12 STM-4 622.08

OC-48 / STS-48 STM-16 2488.32 (2.5 Gb/s)

OC-192 / STS-192 STM-64 9953.28 (10 Gb/s)

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Typical ATM Port/Network Interfaces

Format Mb/s Physical

T1 1.5 copper/coax

E1 2 copper/coax

E3 34 coax

T3 45 coax

DS-3 45 coax, fiber

4B/5B 100 fiber

TAXI 100 fiber, UTP/STP

TAXI 140 fiber

STM-1 155 fiber, UTP/STP

STS-3(c) 155 UTP/STP

OC-3(c) 155 fiber

STM-4 622 fiber

STS-12(c) 622 fiber

OC-12(c) 622 fiber

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Quality of Service Classes

QoS Traffic Service

class parameters class Application

0 unspecified UBR, ABR best effort

1 specified CBR voice, circuit emulation

2 specified VBR video, audio

3 specified conn. data data transfer

4 specified conn.less data data transfer

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Page 51: Asynchronous Transfer Mode (ATM) Switch Technology and Vendor ...

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Switch Vendor Chart

TypeFabric

architectureFabric

speed Gb/sFabric

redundancy

Max # SONET

ATM portsMax portinput Gb/s

Callcontrol

Bay Networks CA MS Mx 5.0 no 16 2.5 Cent

Fore Systems CA TDM Bus 2.5 no 16 2.5 Dist

Cisco CA n/a 2.5 no 16 2.5 Cent

Newbridge Vivid CA SS Fabric 1.6 no 12 1.86 Cent

Hughes CA/EN BC Mx 2.5 optional 16 2.5 Dist

Lightstream CA/EN SS Fabric 2.0 optional 18 2.8 Dist

GTE CA/EN BC Mx 1.2/8 port optional 16 2.5 Cent

Telematics EN TDM Bus 2.5 optional 14 2.2 Dist

NET EN TDM Bus 1.2 no 90❈ 4.0 Dist

Newbridge 36150 EN SS/MS Mx ✠ 2.5 optional 16 2.5 Cent

DEC EN SS Fabric 10.4 n/a 52 10.4 Dist

Alcatel CO MS Mx ✝ 10 no 29 1.2 Dist

General Datacomm CO/EN BC Mx 6.4 optional 32 4.96 Both

Stratacom CO/EN SS Fabric 9.6 yes 36❈ 5.4 Dist ★

Newbridge 36170 CO SS Fabric 12.8 yes 64 10 Cent

TRW CO SS Fabric 12.8 yes 16 2.5 Dist

AT&T CO MS Mx 2.4 - 2.0✩ yes 128 20 Dist

Northern Telecom CO SS Fabric 1.2 optional 8 1.2 Cent

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Switch Vendor Chart (con’d)

✢ This feature is present but further details not provided.

✱ 4K VPCIs per slot, 16K connections total

✙ per switch, 16 VPs and 1024 VCs per port, but 2000 max per switch is the most significant value

◆ In fabric buffer, not strictly input

✦Total, allocated per VC, not per port

❉ Stratacom says EFCI, different acronym, same idea

✫ Generic Cell Rate Algorithm (Frame Relay)

Outputbuffer

cells/port

Inputbuffer

cells/portTraffic

managementCongestion

control/avoidance# QOSclasses

# Prioritylevels

VPCIs/port

Bay Networks n/a no none none 1000✱

Fore Systems 2.4K no dual leaky bucket none

Cisco ✢ no dual leaky bucket none

Newbridge Vivid 4K no none (shaping) call admission control 3 2000✙

Hughes 4K-8K no policing✢ congestion mgmt✢ 14 4096

Lightstream 4K-8K 6K dual leaky bucket selective frame loss 5 multiple✢

GTE 2K, 4K, 8K 70◆ priority preemption call admission control 8

Telematics n/a n/a n/a n/a

NET ✢ no no BECN flow control 2

Newbridge 36150 n/a n/a triple leaky bucket call admission control

DEC 128K 2500 none (shaping) credit-based & FECNflow control

Alcatel n/a n/a none none 4000

General Datacomm ✢ small✢ 4 leaky buckets none 2

Stratacom 24K 64K ✦ dual leaky bucket

GCRA✫

call admission controlrate-based flow controlFECN flow control ❉ selective cell discard

32 1000

Newbridge 36170 n/a n/a triple leaky bucket call admission control

TRW ✢ ✢ dual leaky bucket,virtual scheduling

selective cell discard,FECN flow control

3

AT&T n/a n/a 4 loss priorities feedback flow control 4 2 4096

Northern Telecom ✢ n/a dual leaky bucket none 4

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Switch Vendor Chart (con’d)

SVCs NNIsMulticastaddressing LANE

VirtualLAN

IP overATM API

Otherfeatures/comments

Bay Networks ● ● ● ● ● ❍ ❍

Fore Systems ● ● ● ● ● ● ●

Cisco ❍ ❍ ❍ ❍ ❍ ❍ ❍

Newbridge ViVid ● ● ● ● ● ● ❍

Hughes ❍ ❍ ❍ ❍ ❍ ❍ ❍

Lightstream ● ● ❍ ❍ ❍ ❍ ❍

GTE ● ❍ ❍ ❍ ❍ ❍ ❍

Telematics ❍ ❍ ❍ ❍ ❍ ❍ ❍

NET ● ❍ ❍ ● ● ❍ ❍

Newbridge 36150 ● ● ● ● ● ● ❍

DEC n/a n/a n/a n/a n/a n/a n/a

Alcatel ❍ ❍ ❍ ❍ ❍ ❍ ❍

General Datacomm ● ● ❍ ❍ ❍ ❍ ❍

Stratacom ❍ ● ❍ ❍ ❍ ❍ ❍

Newbridge 36170 ● ● ❍ ❍ ❍ ❍ ❍

TRW ● ● ❍ ❍ ❍ ❍ ❍

AT&T ● ● ❍ ❍ ❍ ❍ ❍

Northern Telecom ❍ ● ❍ ❍ ❍ ❍ ❍

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Switch Vendor Chart (con’d)

✶ 155 Mbps over singlemode fiber, signalling not specified

❖ 100 Mbps over multimode fiber, signalling not specified

✜ 100 Mbps and 140 Mbps over singlemode and multimode fiber,

LATM (Local ATM) signalling

✪ Trunking (NNI) only

OC-12STS-12

OC3(c)

STS3(c) OC-1 STS-1 TAXI DS3 DS1 T3 T1

International

OtherSTM-1 E3 E1

Bay Networks ❍ ● ❍ ❍ ❍ ❍ ● ❍ ❍ ❍ ● ❍ ❍ 4B/5B

Fore Systems Q295 ● ● ❍ ❍ ● ● ❍ ❍ ❍ ● ● ❍

Cisco ❍ ❍ ● ❍ ● ● ● ❍ ❍ ❍ ● ● ❍

Newbridge ViVid ❍ ● ❍ ❍ ❍ ❍ ❍ ❍ ❍ ❍ ● ❍ ❍

Hughes ❍ ✶ ● ❍ ● ❍ ● ❍ ● ● ● ● ●

Lightstream ❍ ● ❍ ❍ ❍ ❍ ❍ ❍ ● ● ● ● ●

GTE Q395 ● ● ❍ ❍ ● ● ● ❍ ● ❍ ❍ ❍ HiPPI

Telematics ❍ ● ❍ ❍ ❍ ❍ ❍ ❍ ● ● ● ● ● SMDS DXI

NET ❍ ❍ ❍ ❍ ❍ ❍ ● ❍ ● ● ❍ ● ●

Newbridge 36150 ❍ ● ❍ ❍ ❍ ✜ ❍ ❍ ● ● ● ● ●

DEC Q395 ❍ ● ❍ ❍ ❍ ● ❍ ● ❍ ● ● ❍

Alcatel ❍ ✶ ❍ ❍ ❍ ❖ ● ❍ ❍ ❍ ❍ ● ❍ SMDS

General Datacomm ❍ ● ● ❍ ❍ ● ● ● ● ● ● ● ● E2

Stratacom ❍ ● ❍ ❍ ❍ ❍ ❍ ❍ ● ● ● ● ● SMDS

Newbridge 36170 Q395 ● ❍ ❍ ❍ ❍ ❍ ❍ ● ● ● ● ●

TRW Q295 ● ❍ ❍ ❍ ❍ ● ● ❍ ❍ ❍ ❍ ❍

AT&T ✪ ● ● ❍ ❍ ❍ ● ● ❍ ❍ ● ● ●

Northern Telecom ❍ ● ❍ ❍ ❍ ❍ ● ❍ ❍ ● ❍ ❍ ❍

Page 55: Asynchronous Transfer Mode (ATM) Switch Technology and Vendor ...

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