AT&T RELEASE 2 - Manual (Page 9)

TEST THE OUTSIDE LINES You may want to test whether a dial tone is audible at the network interface
connection. If so, you need either a basic rotary dial telephone, a Touch-Tone
telephone with a modular cord, or a tool that tests for dial tones. Because a
MERLIN Plus system voice terminal works only with a control unit, you
cannot use a MERLIN Plus system voice terminal for this test.
1 Bring the telephone or testing tool to the jacks for your outside lines
(either at the network interface or at the jack field).
2 Plug the telephone’s modular cord or the tool’s testing cord into each
outside line jack and listen for a dial tone. See Figure 3.
Figure 3 Testing outside lines for a dial tone.
Step 1: Installing the Control Unit 5