本社 - EPON Transceivers - SEPTEMBER 20, 2005 TOKYO -- Sigma-Links Inc., a joint venture between Fujikura Ltd. and Oki Electric Industry Co., Ltd., have re-vamped their portfolio of EPON optical transceivers for access networks with their latest releases:- the Small form factor OLT(OAT1234S-OLT-Sx) and the corresponding ONU (OAT1234S-ONU-Sx). EPON access networks are commonly deployed in Japan as a key enabler of FTTH technologies. They utilize a point to multipoint architecture providing low cost/ high speed IP video transmission, Internet connections, VOIP and other broadband services. Upstream packets from the individual subscribers are combined using TDM and received by the OLT (Optical Line Terminal) in the central office. Sigma-Links’ OLT transceiver is capable of error free reception of these upstream Ethernet packets within the 400 nsec stipulated by the IEE802.3ah. Importantly, Sigma-Links’ offering does not require a RESET signal that is commonly inserted between optical packets leading to easier logic circuit design of the OLT line card. Similarly, for the subscriber side equipment (which is located in the home), Sigma-Links’ SFF optical transceiver (OAT1234S-ONU-Sx) series incorporates control circuitry that stabilizes individual Ethernet packets within a mere 16 nsec, which improves bandwidth efficiency. The OAT1234S-OLT-Sx series has an added TF (Transmitter Failure Alarm) output and comes in a SFF 2x6 pinout. The OAT1234S-ONU-Sx series is available in an SFF 2x5 pinout. Sigma-Links series of EPON optical access network transceivers are fully compliant with the IEEE802.3ah standard. In addition, there are options available with expanded optical power budget between the Central Office and subscribers. This enables PON systems with a larger number of splits leading to a lower cost and higher efficiency. Sigma-Links has been providing both domestic and international PON system vendors with STM-PON and BPON optical transceivers for more than 10 years, since Oki has started to introduce STM-PON. - END - page top Copyright © 2006 Fujikura Ltd.