N10-005 · Question #359
The unit responsible for the successful shaping and transmission of a digital signal is called:
The correct answer is D. CSU/DSU. A CSU/DSU (Channel Service Unit/Data Service Unit) is the device responsible for conditioning and transmitting digital signals over WAN connections such as T1 or T3 lines.
Question
The unit responsible for the successful shaping and transmission of a digital signal is called:
Options
- Ademarc.
- BT1 hub.
- Csmart jack.
- DCSU/DSU.
How the community answered
(41 responses)- A5% (2)
- B2% (1)
- D93% (38)
Why each option
A CSU/DSU (Channel Service Unit/Data Service Unit) is the device responsible for conditioning and transmitting digital signals over WAN connections such as T1 or T3 lines.
The demarc (demarcation point) is the physical boundary between the service provider's network and the customer's equipment, not a device that shapes or transmits signals.
A 'T1 hub' is not a standard networking device; hubs are Layer 1 LAN devices and do not perform WAN signal shaping.
A smart jack (also called an NID) is a network interface device that provides loopback testing at the demarc, but it does not perform digital signal shaping and transmission.
The CSU/DSU sits at the boundary between the customer network and the WAN provider's digital circuit. The DSU converts the LAN's data format into the format used by the digital WAN line, while the CSU provides signal shaping, line conditioning, and loopback testing to ensure proper transmission on the carrier line.
Concept tested: CSU/DSU function in WAN digital signal transmission
Source: https://www.cisco.com/c/en/us/support/docs/wan/channelized-services/14007-wan-csu-dsu.html
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