WAN Physical Standards
The network administrator is responsible for the WAN connection between the DTE and DCE.
Physical layer WAN standards focus around this connection between the DTE and the DCE.
The following are the physical layer WAN standards:
- EIA/TIA 232 - aka RS-232; transfers data at up to 20 kbps over 15 meters with DB25 connector
- EIA/TIA 449 - aka RS-449; faster serial interface version of RS-232, transfers data up to 2 mbps over 60 meters using a DB37 connector
- EIA 530 - successor to RS-449; aka RS-530, up to 2 mbps using DB25 connectors; not compatible with RS-232
- High-Speed Serial Interface (HSSI) - Cisco and T3Plus Networking developed this standard; operates up to 52 mbps up to 15 meters