350-801 · Question #43
An administrator is trying to change the default LINECODE for a voice ISDN T1 PRI. Which command makes the change?
The correct answer is C. linecode b8zs. T1 PRI circuits in North America use B8ZS (Bipolar 8-Zero Substitution) as the standard line coding. B8ZS replaces sequences of eight consecutive zeros with a specific bipolar violation pattern, allowing the transmission of all-zero bytes without violating the ones-density…
Question
An administrator is trying to change the default LINECODE for a voice ISDN T1 PRI. Which command makes the change?
Exhibit
Options
- Alinecode ami
- Blinecode hdb3
- Clinecode b8zs
- Dlinecode esf
How the community answered
(28 responses)- A7% (2)
- B4% (1)
- C86% (24)
- D4% (1)
Explanation
T1 PRI circuits in North America use B8ZS (Bipolar 8-Zero Substitution) as the standard line coding. B8ZS replaces sequences of eight consecutive zeros with a specific bipolar violation pattern, allowing the transmission of all-zero bytes without violating the ones-density requirement. The command 'linecode b8zs' configures this on the controller interface. AMI (Alternate Mark Inversion) is the older line coding standard and was replaced by B8ZS for T1. HDB3 (High Density Bipolar 3) is used for E1 circuits, not T1. ESF (Extended Super Frame) is a framing format, not a line code, and is not applied with the linecode command.
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