TEL-14 TWO-CHANNEL TE LEPHONE INTERFACE
3-3
10.
Excessive echo, background noise, or instability is heard during
telephone calls or just at the start of a call.
•
The TEL-14 will usually adapt within 5 seconds of the start of a call.
Before it has adapted, voices may temporarily sound hollow. This
effect is normal, but may be minimized by reducing the send and/or
receive volume settings.
•
Press the Auto Gain button to light the yellow Auto Gain Adjustable
LED. Decrease the send and/or receive volume controls until
acceptable operation is attained.
•
If a speaker station is used, make sure the mic gain is set low
and reduce the front panel volume level.
•
TEL-14 must be made to renull the telephone line whenever it is
connected to a different telephone number. Perform the
renulling sequence described in Chapter 1.
•
Set the Receive Suppression Disable option switch S6-1 to the
OFF position. This will remove noise coming in from the telephone
line.
•
Set the Intercom Echo Cancel and/or Telephone Echo Cancel
option switches S6-2 and S6-3 to the OFF position. Normally this
is not necessary and it will result in an undesirable reduction of
trans-hybrid loss. These switches should only be set to the OFF
position if instability results in an TEL-14 to TEL-14 connection
between two intercoms. Never do this to both TEL-14 lines in a
connection between two intercoms.
•
Set the HDX Disable option switch S6-6 to the OFF position. This
is a drastic measure which will cure instability on poor telephone
lines, but it will do this at the expense of full-duplex conversation. In
this mode, conversation will be half-duplex unless the TEL-14
automatically detects that full-duplex conversation is possible.
11.
Sound on the telephone line causes the line to disconnect.
The TEL-14 incorporates a precise call progress tone detector,
so it is unlikely to sense speech.
•
If a steady sound seems to be causing the disconnect, set the
Sense Dial Tone option switch S1-2 to the OFF position.
•
If interrupted sounds seem to be causing the disconnect, set the
Sense Busy Tone and/or Sense Reorder Tone option switches
S1-3 and S1-4 to the OFF position.
Refer to the following figures located at the end of this chapter:
1. Block Diagram - TEL-14 Interface
Summary of Contents for ECLIPSE TEL-14
Page 6: ......
