Polycom 4300T - Manual (Page 13)

Introduction
1 - 5
This port is used for debug or local diagnostic purposes only. Primary
configuration of the 4300T is performed from a web browser as covered in
Chapter 3 .
T1/E1 WAN port
The T1 WAN interface with the following features:
• Fully integrated CSU/DSU
• T1 support
• Fractional T1 support
• Layer 2 protocol support for: HDLC, Cisco HDLC (cHDLC), PPP, Frame
Relay
• On-board RJ-48 connector for easy direct connection
• T1/E1 framer and transceiver
— B8ZS/HDB3 zero suppression
— Response to Inband Loop codes
— Manual payload loop through the GUI
• External transmit clock input and receive clock output headers
• Timing: internal or external (loop times from the network)
• Provides long haul CSU or short haul DSU signaling
• Meets FCC part 68 protection requirements
The WAN port is used for connection to a data T1 line. The device at the far
end of the line is a router or other device expecting TCP/IP data. Individual
DS-0 channels on the T1 are not used to carry uncompressed voice.
Ethernet WAN port
The Ethernet 10/100 Mbps port on the 4300T can be used as a WAN interface
as an alternative to the T1 interface. This port is typically used when
connecting the 4300T to an existing T1/E1 WAN router, cable or xDSL
modem.