This document introduces various network modules and voice modules for R3660 and R2600 series modular routers. Specifically, it includes Ethernet modules, serial port modules, composite network modules, E1 modules, ISDN BRI modules, asynchronous MODEM modules, analog interface voice modules, etc. The installation and interface usage of each module are explained in detail.

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This document is an installation manual for router network interface cards. It introduces different types of interface cards, including Ethernet interface cards, serial cards, E1 cards, 1UE1 cards, 2UE1 cards, T1 cards, ISDN BRI interface cards, multi-function interface cards, asynchronous MODEM cards, voice interface cards, and expansion interface cards. Each interface card is described in detail with installation steps, panel diagrams, interface card descriptions, and connection diagrams to external devices. The document provides rich product information and installation guidelines.

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