Jumat sore saya ngobrol panjang dengan marketing IconPLN atau Comnet+ sebagai penyedia infrastruktur jaringan Fiber Optik, salah satu lembaga naungan PLN. Dari ceritanya (katanya) beberapa lembaga besar semakin melirik FO PLN ini dibandingkan Excelcom. Sebelumnya Comnet+/IconPLN ini sempat menghadapi masalah koneksi karena proses upgrade ke sistem Synchronous Digital Hierarchy (SDH). SDH adalah standar teknologi dalam transmisi data Fiber Optik:
SDH (Synchronous Digital Hierarchy) is a standard technology for synchronous data transmission on optical media. It is the international equivalent of Synchronous Optical Network. Both technologies provide faster and less expensive network interconnection than traditional PDH (Plesiochronous Digital Hierarchy) equipment. In digital telephone transmission, “synchronous” means the bits from one call are carried within one transmission frame. “Plesiochronous” means “almost (but not) synchronous, ” or a call that must be extracted from more than one transmission frame.
SDH uses the following Synchronous Transport Modules (STM) and rates: STM-1 (155 megabits per second), STM-4 (622 Mbps), STM-16 (2.5 gigabits per second), and STM-64 (10 Gbps).
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