Avocent Cyclades-PR4000 Signaling Method and Dialing Method T1 CAS-BR only, Line Coding, Framing

Cyclades-PR4000

Signaling Method and Dialing Method (T1 CAS-BR only)

T1 with CAS signaling may require additional parameters. For Signaling Method, the selection may be MFR1, DTMF or no signaling. For Dialing Method, the selection may be wink-start or loop-start. The suggested choice is wink-start.

Line Coding

This refers to the way the digital data is encoded in the line. For T1 lines, the options are usually Bipolar with 8 Zeroes Substitution (B8ZS) or Alternate Mark Inversion (AMI). B8ZS is better suited to digital transmissions, so it should be the choice if available. For E1 lines, the options are usually High Density Bipolar of Order 3 (HDB3) and Alternate Mark Inversion (AMI). HDB3 is the more modern of the two and better suited to digital transmissions.

Framing

This refers to how the data bits are framed in the TDM bus. For T1 lines, the possibilities are D4 Super Frame (D4) or Extended Super Frame (ESF). ESF provides error checking and should be the choice if available. For E1 lines, the choices are usually Frame Alignment Signal with or without CRC4 (4-bit Cyclic Redundancy Check). If given a choice, select a line with CRC4, which will provide error checking.

Termination at the Customer Premises

The Cyclades-PR4000 supports T1 on a standard 100-Ohm RJ-48C connector and E1 on a standard 120-Ohm RJ-48C connector. In some countries, especially those using E1 lines, the termination may be provided on a Coax G703 connector (75 Ohms). An external interface converter (balum) is necessary in this case.

Chapter 2 - What is in the Box 17