Akin et Uusaren na Saray Network Devices so 25MHz tan saray Multiple to bilang Frequency?

Akin et Uusaren na Saray Network Devices so 25MHz tan saray Multiple to bilang Frequency?

Diad saray kagawaan ed network a singa saray network card, switch, router, tan kagawaan ed Ethernet, say pampili na frequency na crystal oscillator et nadetermina ed saray manunan kimey na kagawaan, saray kakaukolanen na chip, tan saray estandarte na protocol na komunikasyon. Say pangusar na crystal oscillators ya walay frequency ya 25MHz tan saray multiple to et manunan lapud sayan frequency system et maapit ya mipara ed saray estandarte na Ethernet, protocol na komunikasyon, tan saray arkitektura na chip, ya mamapawala na mas simpli ya desinyo, mas abeba so gastos, tan mas maabig so performance. Say detalyadon eksplinasyon et niiter ed leksab:

I. Akin et Pinili so 25MHz bilang Base Frequency?

Say 25MHz et aliwan arbitrarin pinilin balor. Saya so malaknab ya uusaren lapud walay integer multiple ya relasyon to ed pigaran manunan frequency ed komunikasyon ed network, ya mamapasimpli ed panagparakel o panagbiig na frequency.

1.1 Makasumpal ed Ethernet Standard Frequency Requirements

Maples ya Ethernet (100BASE-TX): Manguusar na 25MHz ya relo bilang data transmission frequency.

Gigabit Ethernet (1000BASE-T): Manguusar na 125MHz ya relo, ya 25MHz × 5.

10GbE (10 Gigabit Ethernet) tan onsulok ni: Anggaman mas atagey so manunan frequency na relo (alimbawa, 156.25MHz), kaslakan et naala itan diad pangimultiplika ed 25MHz crystal oscillator panamegley na PLL.

Ipapanengneng na saya ya say 25MHz, bilang base clock frequency, et nayarin direkta o agdirektan onsuporta ed saray operating frequency na PHY/MAC parad manunan kapeles na Ethernet.

II. Kombeniente ed Teknikal ya Implementasyon

2.1 Mainomay ya Panagparakel na Frequency panamegley na PLL

Saray network chips (singa say PHY, MAC, tan switch chips) et mabetbet ya manguusar na PLL (Phase Locked Loop) circuits ed loob da pian makagawa na nakaukolan iran operating clock frequency. 25Say MHz et sakey a moderate ya input frequency ya makapanggawa na kaslakan ya atagey-speed frequency, a singa:

25MHz × 2=50MHz

25MHz × 4=100MHz

25MHz × 5=125MHz

25MHz × 6.25=156.25MHz (parad 10GbE)

Lapud say 25MHz et base frequency ya mainomay ya makalkula na abeban integer multiples, mas mainomay so desinyo na PLL, mas maples so panag-lock, tan mas malet so output.

2.2 Mitunosan ed Saray Pankaukolan ed Chip

Maslak ed saray manggagawa na network device chip (singa say Broadcom, Realtek, Marvell, Intel, tan arum ni) et malinew ya onsusuporta ed 25MHz crystal oscillator input ed saray kakaukolanen na input clock na PHY o MAC chips da, odino mangiiter na operating modes parad 25MHz input.

III. Saray bentaha ed EMC, Circuit Design, tan Gastos

3.1 Mas Maong ya EMI Control tan Atagey ya Integridad na Signal

No ikompara ed saray crystal oscillator ya mas atagey so frequency da (alimbawa, 50MHz, 100MHz, 125MHz, 150MHz, tan 200MHz), say 25MHz et walaan na baleg iran bentaha no nipaakar ed Electromagnetic Interference (EMI):

Say abeban fundamental frequency et manresulta ed daiset ya harmonic interferences;

Say PCB routing et mas mainomay ya unoren ed saray EMI design specifications;

Mas abeba so pankaukolan parad saray padir tan integridad na kuryente, ya mamagaan ed pankasakey na sistema.

3.2 Matakken, Malet, tan Epektibon Crystal Oscillators

Saray 25MHz crystal oscillators et sakey ed saray sankalaknaban ya uusaren ya frequency ed industriya na elektroniko, ya walaan na sarayan bentaha:

Dakel so walad tindaan tan nanduruman klase;

Abeba so gastos ed panaggawa tan abot-abot so presyo na panagsaliw;

Sakey a matatken lan supply chain ya antikey so lead time tan malet so kalidad to.

Saya so makapasagyat a tuloy ed saray managgaway network device ya mankikimey ed baleg a produksyon.

IV. Alimbawa na Aplikasyon ed Praktikal a Desinyo

Say Gigabit Ethernet switch et alimbawa:

Say manunan control chip et mankaukolan na input operating frequency ya 125MHz;

Diad desinyo, nayarin usaren so 25MHz crystal oscillator, tan say frequency et nayarin i-multiplicate ed 125MHz panamegley na chip ya aka-built-in PLL;

Balet, say 25MHz ya relo et nayarin ibunog ed arum ya modules (singa say PHY, MAC, odino clock synchronization modules) panamegley na clock tree;

Saya so makagamor na nankakasakey a lapuan na relo, mamapasimpli ed arkitektura na relo, tan mamawas ed komplikado tan gastos na sistema.

Sumaryo

Saray rason no akin ya uusaren na saray network device so 25MHz tan saray multiple to bilang crystal oscillator frequency et nayarin isumaryo ed onggendan:

Saray Hangjing Crystal Oscillators et mabetbet ya uusaren ed saray network devices (network cards, switches, routers, Ethernet). Nilikud ed saray produkton industrial-grade, mangiyoopresi kami met na malaknab-temperatura ya atagey-sability crystal oscillators (-55~+125℃) tan makapangiter kami na crystal oscillator application tan matching solutions. No walay pankaukolan yo, ag kayo mapaga ya mitongtong ed saray managlako odino teknikal a totoo na Hangjing.