overview the modular integrated optical transmission multiplexer is created with a 16×e1 capacity of transmission interfaces. the equipment also provides various interface modules and voice, data and video services for cities and industrial districts. its optional interfaces support multiservice transmission of large customers and customer groups such as mses, governmental organizations, schools and intelligent residential areas. open standard interfaces are employed to guarantee prompt interlinking of various equipments. the modular integrated transmission optical multiplexer series integrates modular and strong functionalities, low in cost and convenient to apply and expand. multiple protocol interfaces are integrated in an equipment to facilitate multi-service access and transmission, as well as connection with corporate communication networks in different parts. it has been proved to be suitable for all kinds of data, voice and video traffic applications in experiments of different china mobile, china unicom, china netcom and army terminals. features 1+1 optical backup: protection of dual optical interface available to ensure that business would not be interrupted when one pair of optical fibers is confronted with failure. flexible configuration: 4/8/12/16e1 multiplexers and multiple business interfaces are derivable with main system board and different functional modules, to meet different user requirements and customizations. various functional modules: user interface modules (nx64k v.35, v.35, fxo/fxs, e/m, rs232/rs485, and ethernet, etc.), order wire module, network management module (rs422/485, rs232, and 10base-t interface, etc.), rs232 data channel module, and alarm output terminal module, etc. available.