ZyXEL Communications 128MH user manual WAN Terminology, ∙ Dce & Dte, ∙ Pstn & Pots

Prestige 128MH PSTN Router/Hub

Modems of either model also support V.42bis compression to speed up data transfer.

1.3.1 WAN Terminology

∙DCE & DTE

On the two ends of an RS-232 connection, the equipment closest to the telephone line is called the DCE (Data Communications Equipment) and the other the DTE (Data Terminal Equipment). In our case, the modem or the ISDN TA is the DCE, and the Prestige is the DTE.

∙PSTN & POTS

Collectively, the interconnected network of the voice grade networks of the individual telephone companies is called PSTN (Public Switched Telephone Network), and a regular telephone line is often referred to as a POTS (Plain Old Telephone Service) line.

1-4 Getting to Know Your Router/Hub