dslreports logo
site
spacer

spacer
 
    All FAQs Site FAQ DSL FAQ Cable Tech About DSL Distance DSL Hurdles »»
spc

spacer




how-to block ads



Note: This section is out of date and no longer maintained.
It is retained for the value of any residual information contained in it.

DSL - Section 3

More detail.. DSL[2] (Digital Subscriber Line) is a generic name for a family of standards allowing high speed data transfer over telephone lines (POTS), otherwise known as twisted pair. For carrying IP, DSL competes with cable modems, satellite digital data feeds, wireless digital data, ISDN, 56k modems and more expensive frame-relay lines etc.
Since the twisted pair lines used in the telephone network that are to carry DSL are not shielded from interference, there are limits on the distance DSL signals can travel before degrading the maximum DSL speeds available in all DSL standards.
This distance limitation of DSL is only one of many potential technical hurdles to pass before an installation is complete.

..take me back ---- tell me more...

satellite

With some digital TV standards over satellite, it is possible to get Internet access. DirecTV is one well known satellite internet product. The key limitation of commercial TV/internet satellites is the upstream capability... The TV satellite technology now in use is not suited to receiving weak signals that any small home unit could produce, so instead, the satellite listens to its base stations for instructions on what to send, and all users get that, and decide whether it is meant for them, or just discarded. The link from you to the internet, for example a request to get www.netscape.com, must travel over more mundane technology: a phone line, and a plain old fashioned modem. One other disadvantage of satellite is the high latency inherent in such a link. This is a function of the sheer distance between you and the geo-syncronous satellite. Users of DirecTV report data arrives in bursts, of, say, 10-20 seconds, then there is a pause. This makes it technically faster than ISDN and low-end DSL, but practically speaking, slower. Of course if your area is devoid of alternatives, DirecTV will be the only choice!


Sections available: 56k modems, ADSL, ATM, ATU-C, ATU-C/R, ATU-R, AWG:, bandwidth, Bell Operating Companies, BERT, BRI, BRIDGE TAP, bridge taps, bridged ips, cable modems, CAP, CBR, CCITT, CIR, CLEC, CLLI, CO, CODEC, Comparing DSL to 56k modems, CPE, CSU, DAML, DCE, DCLEC, DHCP, distance, DLC, DMT, DMZ, DNS services, dsl, DSL, DSL-1, DSL-2, DSL-3, DSL-4, DSL-5, DSL-6, DSL-7, DSL-8, DSL:2, DSLAM, dslam, DSU, DTE, ECHO CANCELLER, extra IPs, family of standards, FDM, filter, firewall, fixed ip, FTTC, FTTH, G.lite, HDSL, HFC, high speed, hub, ICMP, IDSL, idsl, IEC, ILEC, inside wiring, installation, introduction, ISDN, ISP, ITU, IXC, key points, LATA, latency, LEC, lit up, load coil, local loop, loop, maximum DSL speeds, Mbps, MDF, MODULATION, MVL, NAT, NEBS, NEXT, NID, OC48, operating servers, ordering process, packet drops, PCM, pictures, Point of Demarcation, POTS, PPP, PPP vs bridged, PPPoA, pppoe, PPPoE, PRI, private ip, PSTN, PTT, PVC, QAM, RADSL, RBOC, registry settings, router, satellite, SDSL, security, sharing, shielded, SLA, SNR, socks, splitter, SVC, TDM, technical hurdles, terms and conditions, throughput, truck roll, twisted pair, UBR, UDP, UTP, VBR, VDSL, wireless,
WebKbomatic