SONET: netwọk anya synchronous, ọkọlọtọ nnyefe dijitalụ, ka ewepụtara na United States na 1988. A na-akọwa akara ngosi eletriki ọkwa 1 dị ka STS-1, na ọkwa 1 ngwa anya na-egosi OC-1, yana ọnụ ọgụgụ nke 51.84Mb. / s. Na ndabere nke a, kwalite site multiplexing ka mma nnyefe ọsọ na nnyefe arụmọrụ.E mesịa, ITU-T guzobere mba n'otu nke SDH ọkọlọtọ ụwa dabere na ọkọlọtọ a, ya mere SONET nwere ike na-ewere dị ka akụkụ nke SDH ọkọlọtọ.
SONET na-akọwa oyi akwa interface optical anọ, site n'elu ruo na ala bụ:
1. Igwe oyi akwa photon (Photonic Layer) na-arụ ọrụ nnyefe bit gafee eriri anya, ma na-ahụ maka ntụgharị n'etiti akara eletrik nke nnyefe synchronous (STS) na mgbama ngwa anya nke ngwa anya ụgbọelu (OC). A na-eme nzikọrịta ozi site n'aka ndị ntụgharị eletrọ-optic na oyi akwa a.
2. Ngalaba oyi akwa (Ngalaba Layer) na-enyefe STS-N okpokolo agba na eriri anya. Ọ nwere ọrụ nke ịmepụta na nchọpụta njehie.
Igwe abụọ dị n'elu dị mkpa, mana akwa abụọ na-esote bụ nhọrọ.
3. Oghere ahịrị ahịrị (Line Layer) na-ahụ maka mmekọrịta oyi akwa ụzọ na multiplexing, na nchedo akpaka nke mgbanwe.
4. Ụzọ oyi akwa (Path Layer) na-emeso nnyefe nke ọrụ n'etiti ngwaọrụ ọnụ ụzọ PTE (Path Terminating Element), Na nke a PTE bụ aịgbanweena ike SONET. Oghere ụzọ ahụ nwekwara interface na netwọkụ na-abụghị SONET.
Enwere ike ịhụ ọkwa anọ ndị a dị ka akụkụ nke oyi akwa anụ ahụ na ụdị oyi akwa OSI 7, n'ihi na akụkụ anọ ahụ dị na oyi akwa physics OSI.
SONET Ebe a na-ejikarị bụ ọnụego nnyefe ya akọwapụtara:
OC-1 - 51.84Mbit/s
OC-3 — 155.52 Mbit/s
OC-12 — 622.08 Mbit/s
OC-24 — 1.244 Gbit/s
OC-48 — 2.488 Gbit/s
OC-96 — 4.976 Gbit/s
OC-192 — 9.953 Gbit/s
OC-256 — ihe dịka 13 Gbit/s
OC-384 — ihe dịka 20 Gbit/s
OC-768 - ihe dịka 40 Gbit/s
OC-1536 - ihe dịka 80 Gbit/s
OC-3072 — ihe dịka 160 Gbit/s
Anyị na-ekwu maka netwọk eriri synchronous, mmeghe n'ozuzu bụ ọdịnaya dị n'elu. N'ihi na ihe metụtara ngwa netwọk anya fiber na-etinye aka na Shenzhen HDV Photoelctron Technology Co., Ltd., dị ka: AC.ONU/MkpakọrịtaONU/ nwere ọgụgụ isiONU/ eriri anyaONU/ XPONONU/ GPONONU, ma ọ bụOLTusoro, usoro transceiver na ndị ọzọ. Bụ ụdị akụrụngwa netwọkụ, ọ bụrụ na ọ dị mkpa maka ndị ahịa, ị nwere ike ịlaghachi na ibe ụlọ ka ịkpọtụrụ ụlọ ọrụ anyị, na-eche ọnụnọ gị.
