40-400-00032, Rev. B
1
Telephone Line Simulator
TLS-3B
INTRODUCTION
The Teltone TLS-3B is a portable, two-line device that emulates the public telephone
network. The TLS-3B is a tool for demonstrating telephone instruments and other
telecommunications equipment, such as fax machines and modems. The TLS-3B’s
small size and light weight make it ideal for trade shows and other sales
presentations. It can also be used for testing telephone sets, key systems, and PBX
installations.
Like the public telephone network, but on a smaller scale, the TLS-3B can provide
dial tone, audible ring and busy signals to two telephones or other devices connected
to it. When a user picks up one phone (or other device) to dial up the second phone,
the TLS-3B sends ringing current to the second phone until it goes off-hook. The
TLS-3B then establishes a connection between the two phones. Either telephone can
then initiate a disconnect sequence by going on-hook.
Many of the TLS-3B’s features are programmable, including telephone numbers, off-
hook modes, signal delays, test tone frequencies, and line attenuation. The TLS-3B
also provides Caller Identification information to both lines, and lights a Visual
Message Waiting indicator.
In other words, the TLS-3B is a simple telephone network in a box. When a telephone
connection is not available, or when installing a temporary telephone line would be
costly, the TLS-3B provides all the signals and functions you will need to
demonstrate or test your telephones, modems, and other telecommunications
equipment.
TLS-3B CONNECTORS AND LIGHTS
The front panel of the TLS-3B has two telephone line jacks, with a green status
indicator light for each line, and a green Power indicator light. The power input
connector is on the rear panel. See Figure 1.
