CPE Network Topology & Cabling Standards Flashcards
6 cards from real CPE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CPE Network Topology & Cabling Standards flashcards as text
What is the maximum segment length for PROFIBUS DP at 12 Mbit/s using Type A cable?
Answer: 100 m
At the maximum 12 Mbit/s baud rate, the segment length is limited to 100 meters due to signal propagation and timing constraints.
Which PROFIBUS topology allows a star wiring arrangement while still maintaining the logical bus structure?
Answer: Both A and B are correct methods
Active RS-485 star hubs and optical fiber star couplers both allow physical star wiring while preserving the PROFIBUS logical bus behavior.
In PROFIBUS PA cabling, what is the typical supply voltage range provided to field devices over the two-wire MBP bus?
Answer: 9–32 V DC
PROFIBUS PA (IEC 61158-2 MBP) field devices operate from 9 V to 32 V DC supplied over the same two-wire cable used for communication.
What is the maximum current that a single PROFIBUS PA segment power supply can deliver to bus-powered field devices?
Answer: 500 mA
A standard PROFIBUS PA segment power conditioner typically limits total segment current to 500 mA to protect the bus and support intrinsic safety constraints.
What is the maximum segment length for a PROFIBUS PA segment using standard (non-IS) installation?
Answer: 1,900 m
A PROFIBUS PA segment in standard installation can extend up to 1,900 meters using the recommended cable type with appropriate power supply.
In PROFIBUS DP, what is a 'spur' (stub) and what is the maximum recommended stub length at 12 Mbit/s?
Answer: A branch cable from the trunk to a single device; maximum 0.3 m at 12 Mbit/s
A spur (stub) is a short branch off the main trunk cable; at 12 Mbit/s stubs must not exceed 0.3 m to avoid signal reflection errors.