Ericsson Microwave and Transmission Solutions Flashcards

What does XPIC stand for in Ericsson MINI-LINK microwave systems?

Answer: Cross-Polarization Interference Cancellation

XPIC stands for Cross-Polarization Interference Cancellation, enabling both polarizations on the same frequency to double spectral efficiency.

Which Ericsson product family is the primary platform for microwave backhaul?

Answer: MINI-LINK

Ericsson's MINI-LINK product family is specifically designed and marketed for microwave backhaul applications.

What is the primary purpose of Adaptive Coding and Modulation (ACM) in a microwave link?

Answer: To adjust modulation order and coding rate based on current link conditions

ACM dynamically lowers the modulation order during signal degradation (e.g., rain fade) to maintain link availability at the cost of reduced throughput.

Which synchronization standard provides phase and time synchronization required by LTE and 5G in Ericsson microwave backhaul?

Answer: IEEE 1588v2 (PTP)

IEEE 1588v2 (Precision Time Protocol) delivers sub-microsecond phase/time accuracy needed for LTE TDD and 5G NR synchronization.

What frequency range defines the E-band used in high-capacity Ericsson MINI-LINK deployments?

Answer: 71–86 GHz

E-band occupies 71–86 GHz, offering large channel bandwidths (up to 2 GHz) that enable multi-gigabit backhaul over short distances.

What does ATPC stand for in Ericsson microwave transmission systems?

Answer: Automatic Transmit Power Control

ATPC (Automatic Transmit Power Control) reduces transmit power during clear conditions to minimize interference and save energy, increasing power only when the link fades.

What is the primary advantage of a hybrid microwave solution that combines fiber and wireless links?

Answer: Provides path diversity for increased resilience and aggregate capacity

Hybrid microwave bonds a fiber path and a wireless path, so if one path degrades the other compensates, improving both availability and total capacity.