In E-Line services, user-side interfaces are typically UNIs (User Network Interfaces), and network-side interfaces are NNIs (Network-to-Network Interfaces). Also, user-side interfaces are generally Layer 2 ports, whereas network-side interfaces are Layer 3 ports. This distinction facilitates proper service access and network integration. The user side provides services to clients, while the network side connects different network segments or devices. This layering and interface classification are essential concepts in HCIP-Transmission for service provisioning and network architecture design.
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