PDH optical transceiver(Plesiochronous Digital Hierarchy), sistimi ea phetiso ea dijithale ea quasi-synchronous. PDH optical transceivers ke li-transceivers tsa optical tse nang le bokhoni bo bonyenyane. PDH optical transceivers hangata e sebelisoa ka bobeli, hape e bitsoa lits'ebetso tsa point-to-point. Bokhoni ka kakaretso ke 4E1, 8E1, 16E1.

PDH optical transceiver function: PDH optical transceiver e loketse bakeng sa marang-rang a marang-rang a marang-rang, marang-rang a marang-rang a marang-rang, puisano ea mohala (seteishene sa setsi), marang-rang a poraefete, marang-rang a DDN, joalo-joalo.

Likarolo tsa PDH optical transceiver:
E amohela li-chip tse kholo tse kholo tse kopaneng, tse nang le litšobotsi tsa tšebeliso e tlase ea matla le ts'epahalo e phahameng. Fana ka ts'ebetso ea tlhahlobo ea "loopback" e hole ea E1, e bonolo ho e hlokomela. E fana ka likanale tsa 4 E1; e na le ts'ebetso e felletseng ea alamo, e ka bonts'ang lialamo tsa lehae le tse hole. Tlhahisoleseding ea alamo (ho kenyeletsoa alamo ea ho hlōleha ha matla) e ka tlalehoa ho thaka ka mocha oa tsamaiso ea marang-rang. Ho sebelisa lisebelisoa tsa optical tse kopantsoeng tsa transceiver, ts'ebetso e tsitsitseng le e ka tšeptjoang ea ho sebetsa. Moralo oa boto e le 'ngoe ea mochini oohle o nyane ka boholo ebile o bonolo ho o sebelisa.

Melemo e mene ea PDH optical transceiver:
1. Tekanyetso e kopaneng ea segokanyimmediamentsi sa sebolokigolo le sekgahla se kopaneng se fana ka monyetla wa ho hokahana pakeng tsa disebediswa tse tswang ho bahlahisi ba fapaneng.
2. Bokhoni ba tsamaiso ea marang-rang bo ntlafalitsoe haholo.
3. Ka khopolo, ho hlahisoa khopolo e ncha ea marang-rang ea ho ipholisa. Ha lets'oao le ka sehloohong la mecha ea phatlalatso ea phetisetso le khaotsoe, le tla boela le qalelle puisano e tloaelehileng ka marang-rang a ho ipholisa. v
4. Theknoloji ea li-Byte multiplexing e amoheloa ho etsa hore matšoao a makala a holimo le a tlaase a marang-rang a be bonolo haholo.

Hobane PDH e na le melemo e tsotehang e boletsoeng ka holimo, e tla fetoha e 'ngoe ea mahlale a mantlha a ho lemoha litaba tse kholo. Empa litseleng tsa makala le litseleng tsa fereko tse amanang le tsela e kholo ea boitsebiso, lisebelisoa tsa PDH optical transceiver li ntse li tla ba molemo.

PDH optical transceiver e phethela haholo phihlello ea khoebo ea E1 le Ethernet, mme e hlokomela ts'ebetso ea puisano ea ntlha-to-point ea lets'oao la E1 le lets'oao la Ethernet ka ho pheta-pheta ho 1 phetiso ea matšoao a optical. Sebelisa sebaka se senyenyane, tlhophiso e feto-fetohang, ts'ireletso ea phepelo ea motlakase habeli.