# Before You Configure PPP

Before you configure a PPP interface, configure the interface or tunnel over which PPP traffic will flow. See the following chapters:

- Configuring Channelized T3 Interfaces in JunosE Physical Layer Configuration Guide
- Configuring T3 and E3 Interfaces in JunosE Physical Layer Configuration Guide
- Configuring Unchannelized OCx/STMx Interfaces in JunosE Physical Layer Configuration Guide
- Managing Tunnel-Service and IPSec-Service Interfaces in JunosE Physical Layer Configuration Guide
- Configuring ATM
- Configuring Packet over SONET
- Configuring Point-to-Point Protocol over Ethernet

The procedures described in this chapter assume that a physical interface has been configured.