Which bus interconnects RCCs and line cards?

The correct answer is D. redundancy bus. Option D, the redundancy bus, is correct because it is specifically designed to interconnect Route/Redundancy Control Cards (RCCs) and line cards, enabling active/standby switchover so the system can maintain operation when a primary RCC fails - this is its dedicated…

Cisco Mobile Packet Core Architecture

Question

Options

Acontrol bus
Bsystem management bus
CTDM bus
Dredundancy bus

How the community answered

(15 responses)

B
7% (1)
C
7% (1)
D
87% (13)

Explanation

Option D, the redundancy bus, is correct because it is specifically designed to interconnect Route/Redundancy Control Cards (RCCs) and line cards, enabling active/standby switchover so the system can maintain operation when a primary RCC fails - this is its dedicated architectural role in chassis-based systems.

Why the distractors are wrong:

A (Control bus): Carries control-plane signaling across the system broadly, but is not the dedicated link between RCCs and line cards for redundancy synchronization.
B (System management bus / SMBus): Handles out-of-band hardware management tasks like monitoring temperatures and voltages (e.g., I2C-based communication), not card-to-card redundancy.
C (TDM bus): Carries time-division multiplexed traffic (voice/data payloads) between line cards; it moves user-plane data, not redundancy state.

Memory tip: Use the "R–R–R" rule - the Redundancy bus links RCCs for Recovery. If the question mentions switchover, failover, or keeping backup cards in sync, think redundancy bus.

Topics

#RCC interconnect#bus architecture#line cards#hardware redundancy

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