Low power 8-channel telecoms chip

1 August 2001 Telecoms, Datacoms, Wireless, IoT

Cirrus Logic's analog low power front-end (AFE) communications chip offers up to eight lines per chip. According to the company, it is an industry leader in terms of low power consumption. Providers of telephone equipment using the European telephone standard, or 'E1' can now increase central office capacity up to eight times while reducing power consumption by 15%. The crystal CS61881 device replaces current chips used in line cards, SDH transmitters, broadband cross-connects and channel banks.

Patented matched-impedance drivers on the CS61881 reduce power consumption and eliminate the need for a number of external matching components. In applications such as SONET (synchronous optical network) and SDH (synchronous digital hierarchy) multiplexers, the power reduction can be as much as 10 W per 100 E1 channels.

These drivers also eliminate the need for OEMs to manufacture two types of line cards used under current E1 specifications: namely, a 75 Ohm version for noise immunity on coax cable, and 120 Ohm version for reduced-cost twisted pair applications. The CS61881 completely eliminates the need to change external components between 75 and 120 Ohm mode designs. OEMs can design a card usable in both E1 modes, and telco repair technicians need only carry the one type of card into the field. Moreover, elimination of discrete components reduces board space as well as bill of materials and inventory management for OEMs.

Fully G.703 compliant, the CS61881 also conforms to the ETS-300 166 return loss and the short-circuit limiter specifications, performing measurably above those industry specifications.

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