NEC Infoset 408 System Manual

							InfoSet 408Issue 1A
System Manual5 - 5
 
SECTION 3  INSTALLING ADAPTERS
3.1 ACA-U Unit  (AC Adapter)
This unit provides power to ancillary devices or Attendant Consoles.  The
ACA-U Unit must be connected to an adapter that is installed on a
telephone.  If more than one adapter is installed on a telephone, only one
ACA-U Unit is necessary.
The power requirements for the ACA-U Unit are:

Input:  120V AC, 60 Hz, 30W

Output:  24V DC, 750 mA

Polarity:  
3.1.1 Connecting the ACA-U Unit
1. Unplug the line cord from the telephone and unplug the
ACA-U Unit from the AC outlet.  (Failing to do this can
damage the unit and/or the telephone.)
2. Prepare the telephone for adapter installation as described
in Section 2 Preparing the Telephone for Adapter
Installation on page 5-1.
Figure 5-8    Installing Dummy End B
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5 - 6Optional Equipment 3. Locate the AC adapter plug on the ancillary device that is
connected to the bottom of the telephone and plug in the AC
adapter.      
3.2 ADA-U Unit  (Ancillary Device Adapter)
Ancillary Device Adapters allow connection of a tape recorder to Electra
Elite telephones.
When installing an ADA-U Unit, first connect the cables to the ADA-U Unit,
set the dip switches, and then install the ADA-U Unit on the telephone.
When installing the ADA-U Unit, the cables and switch settings should be
done before the unit is installed on the telephone.
3.2.1 Connecting Cables to the ADA-U Unit
Cable terminal connectors are located on the right side of the
ADA-U Unit.  Cables should be connected on this unit before
installing the unit on the telephone.
1. Cut off the plug on one end of the cable.
2. Locate the adapter terminals on the right side of the unit as
illustrated in the diagram. 
Figure 5-9   Connecting the ACA-U Unit
AC Adapter Plug 
						

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System Manual5 - 7
   
3. Remove the cap on the adapter terminal to expose the
metal receptacle. Push the cable in the applicable
receptacle, and replace the cap. Line up the slot on the cap
with the slot on the metal receptacle to ensure proper
contact.    
4. Insulate the end of the cable that needs to be shielded with
insulating tape.
Table 5-1 ADA-U Cable Connections provides a list of cable
connections to ADA-U ADP terminals and describes the
specifications for the terminals. 
Figure 5-10   ADA-U Unit
Figure 5-11   Attaching Cables to the ADA-U Unit
Terminals 
						

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5 - 8Optional Equipment
Table 5-1  ADA-U Cable Connections 
Te r m i n a l
NumberCables to Connect Terminal Specifications
T1When warning tone is not being 
sent from the recorder, connect 
wire pair input from tone 
generator to T1:T2.  The 
warning tones from the 
generator are sent to T1:T2 on a 
dedicated wire pair while the 
speech path is sent from the 
ADA-U on T3:T4 over a 
separate wire pair to the 
recorder.Input Terminal:  T1 and T2 are enabled for 
tone generating device when switches 
SW1-3 and SW1- 4 are OFF.
(If switches SW1- 3 and SW1-4 are ON, a 
humming sound may be recorded due to 
impedance mismatch.)
Input Impedance on T1 and T2:  100K 
W
Input Level on T1 and T2:  –15 dB ~ 40 dB  T2
T3:T4Connect recorder device wire 
pair speech input to T3:T4.
If the recorder used supplies a 
warning tone, this tone may also 
be sent over the T3:T4 wire pair 
back to the terminal.Input/Output Terminal:
Refer to dip switch settings in Table 5-2 
ADA-U Unit Switch Settings.
T5Connect the bare end of the 
control cable.When a telephone is idle, this contact is 
closed.  When the telephone goes off-
hook (using the handset, headset, or 
speakerphone), this contact is open.
  
If recorder owner manual specifies 
start on open circuit, connect T5 and 
T6.
T6Connect the shielded end of the 
control cable.Provides common connection for control 
cable.
T7Connect the bare end of the 
control cable.When the telephone is idle, this contact is 
open.  When the telephone is busy (using 
the handset, headset, or speakerphone), 
this contact is closed.
If recorder owner manual specifies 
start on closed circuit, connect T6 and 
T7.
T8 Unused
T9 Unused 
						

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System Manual5 - 9
Notes:

When recording in handsfree (half-duplex) mode using the built-in
speakerphone, the record warning tone may not be audible to the far-end party. 

The transmit recording level is lower than the receiving voice level for intercom 
calls; the transmit recording level for CO calls is normal.

Depending on the recording device(s), separate cables may be required for the 
warning tone and speech path.  In this case, connect the warning tone cables to 
input terminals T1 and T2 on the ADA-U Unit.  (T3 and T4 are used as the tape 
recorder input.)

If remote control of the recorder is necessary, the record start/stop control is 
provided by connecting to T5 (or T7) and T6 on the ADA-U Unit.  (Connecting to 
T5 or T7 is determined by the specifications of the recorder.)

If a warning Tone is provided from the recording equipment, it should be input via 
T3 and T4 on ADA-U Unit. (Do not use T1 and T2 to input Beep Tone.)

Conversations cannot be recorded from terminals connected to an APR-U Unit.  
Speakerphone calls through the HFU-U Unit cannot be recorded.
Table 5-1  ADA-U Cable Connections  (Continued) 
						

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5 - 10Optional Equipment 3.2.2 Switch Settings
The DIP Switch is located at the bottom center of the ADA-U
Unit. The DIP Switch allows a technician to configure the board
to specific settings. Figure 5-12 ADA-U Unit Switch Settings
shows the default settings. 
The following switch settings should be made on the ADA-U Unit
to enable or disable the record start warning tone. Switch
settings should be made before installing the ADA-U Unit in the
telephone. 
  Figure 5-12   ADA-U Unit Switch Settings
Table 5-2  ADA-U Unit Switch Settings 
Switch Setting Description
SW1–1 OnIf the ADA-U provides 
control to the recorder, 
SW1-1 should be set to On, 
otherwise set it to Off.
SW1–2 Off Leave Off
SW1–3
and
SW1-4SW1–3
ONSW1–4
ON
Warning Tone from 
recording device over same 
wire pair as speech path.
SW1–3
OFFSW1–4
OFF
Warning Tone from 
recorder or generator 
equipment on dedicated 
wire pair to recorder MIC 
input.
Default Settings
Terminals
Dip Switch 
						

							InfoSet 408Issue 1A
System Manual5 - 11 3.2.3 Installing an ADA-U Unit on an Electra Elite Telephone
1. Unplug the telephone cord from the telephone.
2. Prepare telephone for adapter installation as described in
Section 2 Preparing the Telephone for Adapter Installation
on page 5-1.
3. Plug the ADA-U Unit connector into the receptacle
connector on the back of the telephone.  Snap the ADA-U
Unit into the hooks on the telephone to secure it.   
4. Replace base plate.
SW1–5
and
SW1–6SW1–5
OFFSW1–6
ONInput impedance is 600 
W
SW1–5
ONSW1–6
OFFInput impedance  is less 
than 30
W 
SW1–7 ONIf 
warning tone from any 
device is sent to telephone
SW1–8 Off Leave Off

Do not connect T1 and T2 when switches SW1-3 and SW1-4 are ON.
Figure 5-13 Attaching the ADA-U Unit to an Electra Elite 
Telephone Table 5-2  ADA-U Unit Switch Settings  (Continued)
Switch Setting Description 
						

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5 - 12Optional Equipment 5. Lead the audio cable out through the groove on the base
cover.  Plug in the telephone cord.      
3.3 APR-U Unit  (Analog Port Ringer)
The Analog Port Adapter with ringing is the interface for installing single
line telephones, modems, and other compatible analog devices.  The
APR-U Unit also generates ringing signals.  By providing ring generation,
the user can install a personal fax machine or an answering machine for
convenience.  Two user-adjustable switches are provided on the adapter;
one allows for 600W or a complex impedance interface to devices such as
a modem or single line telephone, the second switch (SW1) is set to
position 2.  The APR-U Unit 
requires an AC Adapter.  If a CTA-U Unit, or
HFU-U Unit and an APR-U Unit are both installed, only one AC Adapter is
required.    
Figure 5-14   Leading the Audio Cable out from the ADA-U Unit
Figure 5-15   APR-U Unit
ACA-U Unit
(AC Adapter) 
						

							InfoSet 408Issue 1A
System Manual5 - 13 3.3.1 Installing an APR-U Unit on a Telephone
1. Prepare telephone for adapter installation as described in
Section 2 Preparing the Telephone for Adapter Installation
on page 5-1.
2. Plug the unit into the receptacle connector inside the base
plate.  
3. Plug the cord of the ACA-U Unit (AC adapter) into the jack
on the APR-U Unit.  Lead the telephone cord out through
the groove in the base as shown in the diagram.     
Figure 5-16   Attaching the Unit to the Telephone
Figure 5-17   Leading the Telephone Cord out from the Unit 
						

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5 - 14Optional Equipment 4. Close the base plate, lead the AC adapter cord out through
the hole, and snap the cover in place.     
5. Install a ferrite core (provided with the APR-U Unit) by
looping the line cord through the core between the terminal
(one inch from the terminal) and the ESI port.  This core is
only used with the APR-U Unit. 
6. Plug in the power cord on the AC adapter and the telephone
cord in the jack.
3.3.2 Switch Settings
There are two switch settings on the APR-U Unit.    
Figure 5-18   Closing the Base Plate Cover
Figure 5-19   APR-U Unit Switches