isdntheory.htm

BOSON NETSIM是目前最好的路由器模拟软件

  yes">&nbsp; </span>connects 4-wire subscriber wiring to a 2-wire local loop; 
          in the US it is CPE, in Europe it is Telco owned<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">NT2<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Network Termination Type 2 ; directs traffic from 
          various subscriber devices to the NT1 (usually integrated w/NT1)<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">LT<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Line Termination; located on the Telco side, 
          functions are identical to NT1<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt" bgcolor="#FFFF00">
          <p class="MsoNormal">BRI Reference Points:<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt" bgcolor="#FFFF00">
          <p class="MsoNormal">&nbsp;<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">U<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Between NT1 and LE;<span style="mso-spacerun: yes">&nbsp;
          </span>2-wire-loop<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">T<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Between NT2 and NT1; usually virtual<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">S<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Between TE1 and NT2; 4-wire subscriber connection<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">R<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Between TE2 and TA; any non-ISDN DTE connection<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">ISDN Layer 1:<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">&nbsp;<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">BRI bit rate<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">192 Kbps<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Per channel<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">B^1 = 64Kbps<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">&nbsp;<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">B^2 = 64Kbps<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">&nbsp;<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">D = 16Kbps<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">&nbsp;<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Framing and sync = 48Kbps<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">What line-coding does BRI use?<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">2 binary bits to 1 quaternary (2B1Q)<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt" bgcolor="#FFFF00">
          <p class="MsoNormal">TE Pinout:<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt" bgcolor="#FFFF00">
          <p class="MsoNormal">&nbsp;<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">1<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Power source +3V<o:p>
          </o:p>
          </p>
        </td>
      </tr>
      <tr>
        <td width="295" valign="top" style="width:221.4pt;border:solid windowtext .5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">2<o:p>
          </o:p>
          </p>
        </td>
        <td width="295" valign="top" style="width:221.4pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  padding:0in 5.4pt 0in 5.4pt">
          <p class="MsoNormal">Power source