תוכן העניינים
EARFCN
EARFCN עומד על E-UTRA Absolute Radio Frequency Channel Number. It’s a standardized identifier used in LTE (Long-Term Evolution) ו LTE-Advanced cellular networks to uniquely specify the center frequency of a radio channel. Instead of dealing with raw frequencies (לְמָשָׁל, 2140 MHz), network engineers and equipment use EARFCN values for simplicity and consistency.
EARFCN provides a consistent way to reference LTE carrier frequencies globally. FDD (דופלקס חלוקת תדרים): Separate EARFCN for UL and DL. TDD (דופלקס חטיבת הזמן): Single EARFCN (UL/DL share frequency).
RSRP
RSRP (Reference Signal Received Power) is a critical measurement in LTE (Long-Term Evolution) ו 5G-NR (New Radio) networks that quantifies the עוצמת אות from a cell tower (eNodeB/gNodeB) at your device (UE). It’s essential for network performance, handover decisions, וחווית משתמש.
RSRP measures: The average power (ב dBm) received from a single cell-specific reference signal (CRS) over a specific bandwidth (typically one resource block ≈ 180 kHz). Focuses רק on reference signals—not the entire channel noise or interference.
Typical RSRP Values:
| RSRP (dBm) | איכות איתות |
|---|---|
| > -80 dBm | מְעוּלֶה (חָזָק) |
| -80 ל -90 dBm | טוֹב |
| -90 ל -100 dBm | Fair (usable) |
| < -100 dBm | עני (weak/unstable) |
| < -120 dBm | אין אות |
SNR
SNR (יחס אות לרעש) measures the strength of a desired signal relative to background noise. It quantifies how clearly a signal can be distinguished from interference in communication systems (Wi-Fi, תָאִי, אודיו, וכו '). SNR is critical for performance—higher SNR means clearer data transmission, fewer errors, and faster speeds.
| טווח SNR | Performance Impact |
|---|---|
| > 30 dB | Flawless 4K streaming, low-latency gaming. |
| 20-30 dB | Smooth HD video, fast browsing. |
| 10–20 dB | Basic web browsing; occasional buffering. |
| 0-10 dB | Unstable connectivity; frequent drops. |
| < 0 dB | Connection lost (noise overwhelms signal). |
SNR vs. Related Metrics:
| מֶטרִי | פוקוס | SNR Comparison |
|---|---|---|
| RSRP | Raw signal strength (LTE/5G). | SNR depends on RSRP—but subtracts noise. |
| RSSI | Total received power (אות + רַעַשׁ). | SNR = (RSSI – רַעַשׁ) / רַעַשׁ. |
| סינר | Signal vs. רַעַשׁ + הַפרָעָה (more precise). | Often used interchangeably with SNR. |
QOS
QoS (איכות השירות) is a set of technologies and policies used in networking to prioritize traffic, manage bandwidth, ו ensure reliable performance for specific applications, משתמשים, or services. It’s critical for maintaining consistent user experiences, especially in networks with limited resources (לְמָשָׁל, תָאִי, enterprise, or IoT networks).
Key Goals of QoS:
- עדיפות: Treat high-importance traffic (לְמָשָׁל, שיחות וידאו, שירותי חירום) כפי ש “VIP” over low-priority traffic (לְמָשָׁל, file downloads).
- Resource Allocation: Reserve bandwidth for critical tasks.
- Minimize Latency/Jitter: Keep delays low for real-time apps (VoIP, gaming).
- Reduce Packet Loss: Ensure data isn’t dropped during congestion.
RSSI
RSSI (מחוון עוצמת אות שהתקבל) is a measurement of the total received power (אות + רַעַשׁ + הַפרָעָה) in a wireless communication system. It’s a fundamental metric used across Wi-Fi, תָאִי (LTE/5G), בלוטות, and IoT networks to gauge raw signal strength—but it does not distinguish between useful signals and noise.
בדרך כלל negative values (since dBm is referenced to 1 מיליוואט):
- -30 dBm: Extremely strong (near transmitter).
- -70 dBm: לְמַתֵן (reliable connectivity).
- <-90 dBm: חלש (unstable or unusable).
Comuart
COMUART מתייחס לא UART (מקלט/משדר אוניברסלי אסינכרוני) interface used for תקשורת טורית, typically found in embedded systems, networking hardware, or industrial devices. ה “COM” prefix often denotes its role in communication ports (לְמָשָׁל, RS-232, סדרתי TTL).
AT Debugging
CX6779K Version
שאל שאלה
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