Module interface card is for the high-end modular routers, switch products, for the fixed configuration of routers and switches does not involve the module interface card. Usually the network module is developed for the purpose of extending the LAN function, while the interface card refers to the WAN interface card, which can be conveniently realized by the WAN interface card, router and switch product to achieve more efficient WAN access. The advantage of using modular design is that it can effectively protect the user's investment, truly realize on-demand purchase, while the product can be a strong expansion to meet the expanding needs of the business.
For example, through a network module, the Cisco 2600 Series can be customized to meet the requirements of any network service, and these modules include: multi-service voice and data synthesis, analog and ISDN dialing, ATM access, low density switching, intrusion detection, serial device integration, etc. Some of these network modules are integrated with the interface, can be used directly, some have no interface, only slots, need to install the interface card to use, some of the existing interface and slot, may be used or optional interface card.