This document is the AT-55 Handset Telephone User Guide
The NEC AT-55 is a Caller ID hands-free business telephone designed for connection to KTS/PBX systems. This manual covers safety precautions, installation steps including wall mounting, and initial setup procedures such as setting the calendar, LCD contrast, and ringing volume/tone preferences.
The guide details basic operations like making and receiving calls using either the handset or speakerphone, along with specific features such as call hold, one-touch dialing, memory redial, and microphone mute. It also includes troubleshooting tips and a list of technical specifications.
| Exterior Dimensions | 148 x 219 x 77mm / 5.83 x 8.62 x 3.03 inch |
|---|---|
| Weight | Approx. 0.64 kg / 1.40 lbs |
| Relative Humidity | 10～90% RH（Non-condensing） |
| Caller ID Storage | 90 calls (21 digits) |
This telephone is manufactured for connection to the line provided by KTS/PBX systems.
No, do not connect other analog devices such as FAX/telephone on the same line as parallel connection is not guaranteed.
There are three ringing volume levels to choose from: L (low), M (mid), or H (high).