Cabling tables and nouns

Here there is 3 useful table from Cabling:The Complete Guide to Network Wiring

Common Types of Copper Cabling and the Applications That Run on Them

Cable Type Common Applications
UTP Category 1 Signaling, door bells, alarm systems
UTP Category 2 Digital phone systems, Apple LocalTalk
UTP Category 3 10Base-T, 4Mbps Token Ring
UTP Category 4 16Mbps Token Ring
UTP Category 5 100Base-TX, 1000Base-T
UTP Category 5e 100Base-TX, 1000Base-T
UTP Category 6 100Base-TX, 1000Base-T, 10 Gigabit Ethernet
Multi-pair UTP cable Analog and digital voice applications
Shielded twisted-pair (STP) 4Mbps and 16Mbps Token Ring
Screened twisted-pair (ScTP) 100Base-TX, 1000Base-T, 10 Gigabit Ethernet
Coaxial RG-8 Thick Ethernet (10Base-5), video
Coaxial RG-58 Thin Ethernet (10Base-2)
Coaxial RG-59 CATV (Community antenna television, AKA, cable TV)
Coaxial RG-6/U CATV, CCTV (Closed Circuit TV), satellite, HDTV, cable modem
Coaxial RG-6/U Quad Shield Same as RG-6 with extra shielding
Coaxial RG-62 ARCnet, video, IBM 3270

Applications That Use Unshielded Twisted-Pair Cables

Application Data Rate Encoding Scheme Pairs Required
10Base-T Ethernet 10Mbps Manchester 2
100Base-TX Ethernet 100Mbps 4B5B/NRZI/MLT-3 2
100Base-T4 Ethernet 100Mbps 8B6T 4
1000Base-T Gigabit Ethernet 1000Mbps PAM5 4
100Base-VG AnyLAN 100Mbps 5B6B/NRZ 4
4Mbps Token Ring 4Mbps Manchester 2
16Mbps Token Ring 16Mbps Manchester 2
ATM-25 25Mbps NRZ 2
ATM-155 155Mbps NRZ 2
TP-PMD (FDDI over copper) 100Mbps MLT-3 2

Common Modular-Jack Designations and Their Configuration

Designation Positions Contacts Used For
RJ-11 6 2 Single-line telephones
RJ-14 6 4 Single- or dual-line telephones
RJ-22 4 4 Phone-cord handsets
RJ-25 6 6 Single-, dual-, or triple-line telephones
RJ-31 8 4 Security and fire alarm
RJ-45 8 8 Data (10Base-T, 100Base- TX, etc.)
RJ-48 8 4 1.544Mbps (T1) connections
RJ-61 8 8 Single- through quad-line telephones

The UNIX Time-Sharing System

While I was surfing, I have faced to a MUST read old text about UNIX by old gurus Ritchie and Thompson. You can read The UNIX Time-Sharing System if you are intrested.

There have been four versions of the Unix time-sharing system. 12 The earliest (circa 1969-70) ran on the Digital Equipment Corporation PDP-7 and -9 computers. The second version ran on the unprotected PDP-11/20 computer. The third incorporated multiprogramming and ran on the PDP-11/34, /40, /45, /60, and /70 computers; it is the one described in the previously published version of this paper, and is also the most widely used today. This paper describes only the fourth, current system that runs on the PDP-11/70 and the Interdata 8/32 computers. In fact, the differences among the various systems is rather small; most of the revisions made to the originally published version of this paper, aside from those concerned with style, had to do with details of the implementation of the file system.
Since PDP-11 Unix became operational in February, 1971, over 600 installations have been put into service. Most of them are engaged in applications such as computer science education, the preparation and formatting of documents and other textual material, the collection and processing of trouble data from various switching machines within the Bell System, and recording and checking telephone service orders. Our own installation is used mainly for research in operating systems, languages, computer networks, and other topics in computer science, and also for document preparation.

HOW TO know more as a newbie?

It is not a long time which ubuntu became one of the most popular Linux distributions. I have received a pack of 10 CDs from ubuntu shipit service and share theme with some friend and colleague. As most of them are completely new to the Linux world I have usually forced to answer lots of question! (Most of the time I am talking about RTFM methodology after two or three times :)) so here , I want to list some of useful internet guide for a Linux SMART newbie:

– Your first place for all the time is our big brother, Google. Don’t hesitate to ask your question from G!
– Most of the famous distributions have their own web forum or community. but for most of the you can refer to LinuxQuestions.
– Up to your languages, there should be some kind of LUG or local community for you area. if you are Iranian or talking Persian you can use Technotux and هزاردستان!
– Talking about Ubuntu, I have to mention Unofficial Ubuntu Starter Guide (Persian) , Ubuntu Blog , Ubuntu Forums
– You can view a long list of Screenshots from different distributions at OSDir Screenshot Gallery. OSDir is a member of O’REILLY NETWORK.
– You can view list of different distributions at the DistroWatch website. If you want to know more about Major Distributions or be aware of the latest news don’t forget to read DW Weekly !
– There is tons of other resource available in the internet, like Linux Documentation Project and mailing lists.

p.s: Add any url you think could be a useful one !

WTF: Technocrat

1. An adherent or a proponent of technocracy.
2. A technical expert, especially one in a managerial or administrative position.

Noun 1. technocrat – an expert who is a member of a highly skilled elite group
elite, elite group – a group or class of persons enjoying superior intellectual or social or economic status
expert – a person with special knowledge or ability who performs skillfully
Noun 2. technocrat – an advocate of technocracy
pol, political leader, politico, politician – a person active in party politics