Category Archives: TAC

iDirect TAC Tips – How to find out model, serial number and software loaded onto a remote or a line card

How to find out model, serial number and software loaded onto a remote or a line card

Assume you are a HNO and recently obtained new remotes or line cards to enhance your existing hub.  As you learned during iDirect’s IOM course, the software and the options file of the new devices must be examined, and most likely updated.

But how can you quickly find out what is loaded on the device, along with the model and serial number?

There is a command that does just that, all at once. That command is ‘versions_report,’ available from the falcon application prompt.

Here is how to use it. This assumes you have IP or console connectivity.

1)      telnet to device

2)      issue command ‘versions_report’

This command will show at once the model, serial number and software loaded on device.  Sample output below, from XLC-M line card SN 28765. Read More

iDirect TAC Tips – What is ‘Unique Word’ in TDMA?

What is ‘Unique Word’ in TDMA?

This image represents a burst, whose time length may be 180 mS.  At the start of the burst the bit sequence follows a predetermined burst preamble or header designed to help the hub receiver demodulator lock onto the carrier. This is described as the “carrier and bit timing recovery sequence and unique word.” A brief period of un-modulated CW carrier is a good start. This helps the demodulator automatic frequency control (AFC) adjust its center frequency and also get the automatic gain control (AGC) so that the level of the carrier is made nominal. Next a period of alternate ones and zeros helps the demodulator to set the exact bit rate e.g. 249,999 bit/sec. Following this is the unique word. This is a pre-selected complex sequence of ones and zeros which the receiver attempts to match against two opposite matching patterns. When a hit is obtained the demodulator knows two things – it can now distinguish a one from a zero and it knows its exact position in the burst. At the end of the unique word the User data message starts. Right at the end may be a cyclic redundancy (CRC) checksum to check if there have been any errors during the burst.  Read more by accessing the full article at the link below.


Top TAC Tips

Technical Assistance Center, iDirect

If you ever have an iDirect product-related question or need technical help, our Partner Technical Assistance Center is manned 24x7x365 by qualified and trained network consultants who are available to answer your questions and solve your issues.

Here are some of our Top Tips for November:

  • iDX 3.0 is now being widely adopted by iDirect customers for its features and stability. iDirect now supports companies with very large networks  running iDX 3.0, like Bentley Walker and Nynex. Not familiar with new features of this release or concerned about upgrade?  We have made it easy for you! Review the iDX 3.0 features and upgrade videos on our Partner Technical Assistance Center at
  • Are you using a Dell server and need to check the warranty status? You do not need to make a call or send an email and wait; the Dell warranty status for your server can be found at . All you need is the serial number/Service tag number from the server. Even if the server is not in front of you, you can log in to the server and type the command dmidecode to find the serial number of the machine.
  • Many times the TAC gets calls concerning network issues and one or more RX line cards displaying an error message such as, “BackPlane Lost SOF.”

Read More

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