Articles by Scott Hebert

  1. T1 / T3 Alarms

    Posted on in Networking

    The following is a list of alarms you may receive on your T1 or T3 (or E1/E3) interface. Where applicable, troubleshooting hints are included.

    Loss of Signal (LOS)

    A Loss of Signal (LOS) alarm indicates that the interface is not receiving a valid T1 or T3 signal. This is …

  2. What is Mutt?

    Posted on in Software

    Mutt is a text-based email client for UNIX-based operating systems. To say it is highly configurable is an understatement. It can be compiled to support a variety of mail protocols and runs in almost any terminal emulator. Unfortunately, the glory days of Mutt have come and gone. In the days …

  3. MLB Schedule Widget

    Posted on in Software

    This is a little off-topic for this website, but I had to pass this widget along for any Mac OS X users out there. The MLB Schedule widget from Logan Rockmore Design is a simple widget that displays the 5 day schedule for any MLB team. It will show the …

  4. Asterisk Channel Variables and the Asterisk::AGI Perl Module

    Posted on in voice

    When calling an AGI from inside your dialplan, you can pass variables to your AGI via the AGI() application call. The AGI() application takes parameters in the following format (note the ';' is only necessary in AEL:

    AGI(command|ARG1|ARG2|ARGn);

    The additional arguments are useful when passing in non-channel …

  5. Using ACLs to Block NetBIOS Traffic on Cisco Catalyst Switches

    Posted on in Networking

    In a Metro Ethernet network, the possibility exists for a lot of NetBIOS broadcasts if your users are connecting directly to the ring rather than through a firewall. My first assumption was that most users would have a firewall, but this is really only guaranteed in the case of business-class …

  10. What is NetBIOS?

    Posted on in Networking

    <table class="protocol_basics" align="right">

    <tr>

    <th colspan="2">
    Protocol Basics

    </th>

    </tr>

    <tr>

    <td>
    Layer:

    </td>

    <td>
    Session

    </td>

    </tr>

    <tr>

    <td>
    Transport:

    </td>

    <td>
    <acronym title="Transmission Control Protocol">TCP</acronym>, <acronym title="User Datagram Protocol">UDP</acronym>

    </td>

    </tr>

    <tr>

    <td>
    Port(s):

    </td>

    <td>
    137, 138 …

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