The revision contains substantive and editorial changes to ANSI X3.137:1988. The standard specifies the general, physical and magnetic requirements for inter-changeability of the one-and two-sided 90mm (3.5 in) (nominal) flexible disk cartridge (for 7958 bits-per-radian (bpr) use) as required to achieve unformatted disk cartridge interchange among disk drives using 80 tracks per side and associated information processing systems.
定价: 570元 / 折扣价: 485 元 加购物车
Specifies the general, physical, and magnetic requirements for interchangeability for the two-sided, 5.25-in (130-mm) flexible disk cartridge (for 13262 flux transitions per radian use) as required to achieve unformatted disk cartridge interchange among disk drives using 77 or 80 tracks per side and associated information processing systems.
定价: 570元 / 折扣价: 485 元 加购物车
Lays down rules for converting between 58 characteristics of CCITT International Telegraph Alphabet No. 2 (Recommendation F.1) and the characters according to the ISO 646 and 6937-2 coded sets. Serves for interaction between international telex service and terminals in data networks if telex character repertoire is sufficient.
定价: 295元 / 折扣价: 251 元 加购物车
Specifies a) procedures for transmission of multicast announcement, multicast address mapping and group composition information between Network entities residing in End Systems and Network entities residing in Intermediate Systems; b) the encoding of the protocol data units used for multicast announcement, multicast address mapping and group composition information.
定价: 1149元 / 折扣价: 977 元 加购物车