WAN Access
Depending on the network environment provided by carriers, users can access the network by using interfaces including GE interfaces, synchronous/asynchronous serial interface, Async interface, CE1/CT1 PRI interfaces, E1-F interfaces, T1-F interfaces, 3G/LTE cellular interfaces, Integrated Services Digital Network BRI interfaces, PoS interfaces, CPoS interfaces, ADSL interfaces, VDSL interfaces, G.SHDSL interfaces, E1-IMA interfaces, CE3 interfaces, E&M interfaces, and xPON interfaces. The router provides dual uplinks to implement interface backup and ensure service reliability.
WAN interfaces depend on the device model and the boards installed.
As shown in Figure1, enterprise A accesses the Internet using ADSL; enterprise B accesses the Internet using GE and E1/CE1 dual-uplink (E1/CE1 link functions as the backup link of the GE link); enterprise C accesses the Internet using G.SHDSL; enterprise D accesses the Internet using 3G. This setting achieves WAN interconnection.
