What is the default option for framing when you configure T1 controller?

The correct answer is C. Extended Super Frame. When configuring a T1 controller in Cisco IOS, the default framing type is Extended Super Frame (ESF). ESF is the modern standard that replaced the older Super Frame (SF/D4) format. ESF groups 24 T1 frames into a superframe, enabling better error detection, out-of-band…

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Question

Options

ASuper Frame
Balternate mark inversion
CExtended Super Frame
Dcyclic redundancy check 4
Ehigh-density bipolar 3
FNo-CRC4
Gbinary 8-zero substitution
HAustralia

How the community answered

(23 responses)

C
87% (20)
F
9% (2)
H
4% (1)

Explanation

When configuring a T1 controller in Cisco IOS, the default framing type is Extended Super Frame (ESF). ESF is the modern standard that replaced the older Super Frame (SF/D4) format. ESF groups 24 T1 frames into a superframe, enabling better error detection, out-of-band signaling, and facilities data link (FDL) for maintenance. The other options - alternate mark inversion (AMI), high-density bipolar 3 (HDB3), binary 8-zero substitution (B8ZS), CRC-4, and No-CRC4 - relate to line coding or are framing options for E1 (not T1). The command 'framing esf' is technically redundant since ESF is already the default.

Topics

#T1 controller#framing#Extended Super Frame#PRI configuration

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