Residential access: point to point access - PowerPoint PPT Presentation

1 / 11
About This Presentation
Title:

Residential access: point to point access

Description:

up to 8 Mbps downstream (today typically 1 Mbps) FDM: 50 kHz - 1 MHz for downstream ... HFC: hybrid fiber coax. asymmetric: up to 30Mbps downstream, 2 Mbps upstream ... – PowerPoint PPT presentation

Number of Views:40
Avg rating:3.0/5.0
Slides: 12
Provided by: JimKurosea317
Category:

less

Transcript and Presenter's Notes

Title: Residential access: point to point access


1
Residential access point to point access
  • Dialup via modem
  • up to 56Kbps direct access to router (often less)
  • ADSL asymmetric digital subscriber line
  • up to 1 Mbps upstream (today typically lt 256
    kbps)
  • up to 8 Mbps downstream (today typically lt 1
    Mbps)
  • FDM 50 kHz - 1 MHz for downstream
  • 4 kHz - 50 kHz for upstream
  • 0 kHz - 4 kHz for ordinary
    telephone

2
  • Use existing telephone lines
  • transmitting higher frequency signals
  • Interpret higher frequency signals

3
Residential access cable modems
  • HFC hybrid fiber coax
  • asymmetric up to 30Mbps downstream, 2 Mbps
    upstream
  • network of cable and fiber attaches homes to ISP
    router
  • homes share access to router
  • deployment available via cable TV companies

4
Cable Network Architecture Overview
Typically 500 to 5,000 homes
cable headend
home
cable distribution network (simplified)
5
Cable modem placement
6
Company access local area networks
  • company/univ local area network (LAN) connects
    end system to edge router
  • Ethernet
  • Shared (hub) or dedicated (switched) link
    connects end system and router
  • 10 Mbs, 100Mbps, Gigabit Ethernet
  • LANs chapter 5

7
Switch, hub examples
  • Suppose C sends frame to D (A, B, C, MAC
    Address)

address
interface
switch
1
1 2 2 3 1
A D E G C
3
2
hub
hub
hub
A
I
F
D
G
B
C
H
E
  • Switch receives frame from from C
  • notes in bridge table that C is on interface 1
  • because D is in table, switch forwards frame into
    interface 2
  • frame received by D

8
Wireless access networks
  • shared wireless access network connects end
    system to router
  • via base station aka access point
  • wireless LANs
  • 802.11b (WiFi) 11 Mbps
  • wider-area wireless access
  • provided by telco operator
  • 3G 384 kbps
  • Will it happen??
  • WAP/GPRS in Europe

9
Cellular standards brief survey
  • 2.5 G systems voice and data channels
  • for those who cant wait for 3G service 2G
    extensions
  • general packet radio service (GPRS)
  • evolved from GSM
  • data sent on multiple channels (if available)
  • enhanced data rates for global evolution (EDGE)
  • also evolved from GSM, using enhanced modulation
  • Date rates up to 384K
  • CDMA-2000 (phase 1)
  • data rates up to 144K
  • evolved from IS-95

10
Cellular standards brief survey
  • 3G systems voice/data
  • Universal Mobile Telecommunications Service
    (UMTS)
  • GSM next step, but using CDMA
  • CDMA-2000
  • .. more (and more interesting) cellular
    topics due to mobility (stay tuned for details)

11
Home networks
  • Typical home network components
  • ADSL or cable modem
  • router/firewall/NAT
  • Ethernet
  • wireless access
  • point

wireless laptops
to/from cable headend
cable modem
router/ firewall
wireless access point
Ethernet
Write a Comment
User Comments (0)
About PowerShow.com