NEC Infoset 408 System Manual

							Issue 1AInfoSet 408
1 - 4System Overview
ETW-4R-1(BK) TELThis 
Dterm Cordless telephone can be connected to the system 
using an ESI port.  The telephone has a cordless handset, a 
10-digit, 2-line, LCD, dial pad, TALK key, HOLD key, TRF key, CNF 
key, SPD key, a MSG LED, optional buzzer and four function keys 
with red LEDs.  
The 
Dterm Cordless telephone can be switched to an Electra Elite 
telephone, which is connected to it, by pressing the DESK key on 
the base unit of the idle 
Dterm Cordless telephone.   8
DTU-8-1 (BK)/(WH) 
TELThis digital multiline telephone has eight line keys (each line key is 
equipped with a two-color LED; unused line keys can be 
programmed for one-touch key operation), built-in speakerphone, a 
Large LED to indicate incoming calls and messages, headset jack, 
and compatibility with ADA-U,  APR-U,  and HFU-U Units. 7
DTU-8D-2 (BK)/
(WH) TELThis digital multiline telephone has eight line keys (each line key is 
equipped with a two-color LED; unused line keys can be 
programmed for one-touch key operation) built-in speakerphone, a 
Large LED to indicate incoming calls and messages, headset jack, 
and compatibility with ADA-U,  APR-U, and HFU-U Units.
This telephone is also equipped with a 24-character, 3-line, 
adjustable Liquid Crystal Display (LCD).  
The DTU-8D-2 (BK)/(WH) TEL provides four softkeys.8
DTU-16-1 (BK)/(WH) 
TELThis digital multiline telephone has 16 programmable line keys 
(each with a two-color LED), a built-in speakerphone, a Large LED 
to indicate incoming calls and messages, headset jack, and 
compatibility with ADA-U, APR-U, and HFU-U Units.7
DTU-16D-2 (BK)/
(WH) TELThis digital multiline telephone has 16 programmable line keys 
(each with a two-color LED), a built-in speakerphone, a Large LED 
to indicate incoming calls and messages, headset jack, and 
compatibility with ADA-U,  APR-U, and HFU-U Units. 
This telephone also has a 24-character, 3-line, adjustable Liquid 
Crystal Display (LCD). 
The DTU-16D-2 (BK)/(WH) TEL  provides four softkeys.8
DTU-32-1 (BK)/(WH) 
TELThis digital multiline telephone has 32 programmable line keys 
(each with a two-color LED), a built-in speakerphone,  a Large LED 
to indicate incoming calls and messages, headset jack, and 
compatibility with ADA-U,  APR-U, and HFU-U Units. 7
DTU-32D-2 (BK)/
(WH) TELThis digital multiline telephone is equipped with 32 programmable 
line keys (each with a two-color LED), a built-in speakerphone,  a 
Large LED to indicate incoming calls and messages, headset jack, 
and compatibility with ADA-U,  APR-U,  and HFU-U Units. 
This telephone has a 24-character, 3-line, adjustable Liquid Crystal 
Display (LCD).  
The DTU-32D-2 (BK)/(WH) TEL  provides four softkeys.8
Equipment Name Description System Maximum 
						

							InfoSet 408Issue 1A
System Manual1 - 5
SECTION 3POWER REQUIREMENTS
The InfoSet 408 KSU has eight dedicated slots, one each for BRT/COI, ESI, VMS/
SLI, PBR, DPH, MIF, and DSL ETUs.
3.1 Power Supply Inputs
The AC input requirements for the InfoSet 408 system are listed below.
AC Input

11 7  Va c  ± 1 0 %

60 Hz ± 10%

Single Phase

12A circuit

A dedicated outlet, separately fused and grounded, is required.
 Adapters and Optional Units
ACA-U UnitThe AC Adapter unit connects to one of the following:  APR-U Unit,   
or HFU-U Unit.  One per Multiline 
Telephone as required
ADA-U UnitThis Ancillary Device adapter provides the digital multiline 
telephone with connection for a tape recorder.
This adapter can be installed on any Electra Elite multiline 
telephone.8
APR-U UnitWhen this Analog Port Ringer adapter is used, an additional single 
line telephone or a modem can be connected to an Electra Elite 
multiline telephone.
This adapter can be installed on any Electra Elite multiline 
telephone.8
HFU-U (BK)/(WH) 
UnitThis optional Handsfree Unit provides full-duplex handsfree 
communication.  This unit comes with the handsfree adapter and 
an external microphone.
This adapter can be installed on any Electra Elite multiline 
telephone.8
SLT(1)-U10 ADPThis Adapter provides an interface for single line telephones and 
other similar devices from an ESI ETU channel.
This adapter is connected to any ESI port.7
Equipment Name Description System Maximum 
						

							Issue 1AInfoSet 408
1 - 6System Overview
3.2 Power Supply Consumption
The power consumption for the InfoSet 408 system is listed in Table 1-2
Power Consumption.   
 
SECTION 4CABLING REQUIREMENTS AND SPECIFICATIONS
This section provides cabling requirements and specifications for various equipment
used in the InfoSet 408 system.

BRT(1)-B10 ETU

COI(2)-B10 ETU

DPH-B10 ETU

ESI(3)-B10 ETU

SLI(2)-B10 ETU
The KSU is connected with each of the Multiline Telephones and Single Line
Telephones by a separate twisted 1-pair cable or 2-pair cable (only for Multiline
Telephones).  (Refer to Table 1-3 Multiline Telephone Loop Resistance and Cable
Length for the loop resistance and cabling requirements for Multiline Telephones and
adapters.)    
  
Table 1-2  Power Consumption
KSUMaximum
RMS
CurrentWatts Used 
(Idle)Watts Used 
(Maximum)
 B408-B10 KSU 2.5 A  120  230 
Table 1-3  Multiline Telephone Loop Resistance and Cable Length 
Terminal or AdapterMaximum 
Loop 
Resistance 
(Ohms)Maximum Feet by 
Twisted 1-Pair 
CableMaximum Feet by 
Twisted 2-Pair 
Cable
24 AWG 24 AWG
DTB-16-1 TEL 26 450 900
DTB-16D-1 TEL 26 450 900
DP-D-1A 20 N/A N/A
DTP-1-1 (WH) TEL 600 N/A N/A
DTP-1HM-1 (WH) TEL 600 N/A N/A
DTP-2DT-1(WH) TEL 35 600 1000
DTU 4R-1(BK) TEL N/A 650 1000
DTU-8-1(BK)/(WH) TEL 35 600 1000
DTU-8D-2(BK)/(WH) TEL 35 600 1000
DTU-16-1(BK)/(WH) TEL 26 450 900 
						

							InfoSet 408Issue 1A
System Manual1 - 7           
 
DTU-16D-2(BK)/(WH) TEL 26 450 900
DTU-32-1(BK)/(WH) TEL 21 360 720
DTU-32D-2(BK)/(WH) TEL 21 360 720
ETW-4R-1 (BK) TEL N/A 650 650
SLT(1)-U10 ADP 35 600 1000
The length for the specified SLT Adapter is the length between the SLT Adapter and 
the ESI port.
The loop resistance for the DTP-1-1 (WH) TEL and the DTP-1HM-1 (WH) TEL includes 
the resistance of the single line telephone.
The loop resistance for the DP-D-1A does not include the resistance of the DP-D-1A 
telephone.
Figure 1-1 Connecting the ESI to the Multiline Telephone Using Twisted 2-Pair 
Cable
Table 1-4  Cable Connection Between the Analog Port Adapter and the Single Line 
Telephone
Connected Equipment CableMaximum Loop 
Resistance from 
Connected 
Equipment to 
TelephoneMaximum Feet by 
Tw i s t e d 1 - P a ir  
Cable
(24 AWG)
APR-U
Twisted Pair 5.4 Ohms 50 Feet
SLT(1)-U10 ADP
Mixing digital and analog ports through the same 25-pair cable runs is not recommended.
Table 1-3  Multiline Telephone Loop Resistance and Cable Length  (Continued)
Terminal or AdapterMaximum 
Loop 
Resistance 
(Ohms)Maximum Feet by 
Twisted 1-Pair 
CableMaximum Feet by 
Twisted 2-Pair 
Cable
24 AWG 24 AWG
M ultiline Telephone
Tw isted  2-P air C a ble
ESI 
						

							Issue 1AInfoSet 408
1 - 8System Overview
SECTION 5ENVIRONMENTAL CONDITIONS
5.1 Temperature

Operating:   +32°F ~ +104°F (0°C ~ 40°C)

Recommended Long Term:   +50°F ~ +90°F (10°C ~ 32.2°C)
5.2 Humidity

Operating:   10% ~ 90% noncondensing
SECTION 6WEIGHTS AND  DIMENSIONS
Table 1-5 Weights and Dimensions shows shipping weight, height, width, and depth
for the InfoSet 408 KSU, optional ETUs, telephones and adapters.   
Table 1-5   Weights and Dimensions
           
UnitShipping 
Weight*Height Width Depth
ACA-U Unit22.5 oz
(638 g)3.4”
(86 mm)4.2”
(107 mm)5.2”
(133 mm)
ADA-U Unit2.3 oz
(65 g)1.1”
(29 mm)2.3”
(59 mm)3.9”
(99 mm)
APR-U Unit4.3 oz
(122 g)2.6”
(66 mm)2.3”
(59 mm)4.8”
(121 mm)
B408-B10 KSU14.33 lbs
(6.5 kg)12.63”
(320 mm)15.19”
(385 mm)4.88”
(124 mm)
BRT(1)-B10 ETU4.59”
(130 g)3.69”
(93 mm)5.44”
(138 mm).82”
(21 mm)
COI(2)-B10 ETU6.53 oz
(185 g)3.69”
(93 mm)5.44”
(138 mm)1.13”
(29 mm)
CID(2)-B10 UNIT3.36 oz
(98 g)2.38”
(60 mm)4.31”
(110 mm)1.13”
(28 mm)
DPH-B10 ETU4.94 oz
(140 g)3.69”
(93 mm)5.44”
(138 mm).82”
(21 mm)
DTU-4R-1 TEL15.4 oz
(437 g)2.25”
(57 mm)4.25”
(108)7.5”
(191)
DTU-8-1(BK)/(WH) TEL41.0 oz
(1163 g)4.8”
(123 mm)7.8”
(197 mm)9.3”
(235 mm)
DTU-8D-2 (BK)/(WH) TEL43.5 oz
(1233 g)4.8”
(123 mm)7.8”
(197 mm)9.3”
(235 mm)
DTU-16-1 (BK)/(WH) TEL41 oz
(1162 g)4.8”
(123 mm)7.8”
(197 mm)9.3”
(235 mm)
DTU-16D-2 (BK)/(WH) TEL43.5 oz
(1233 g)4.8”
(123 mm)7.8”
(197 mm)9.3”
(235 mm) 
						

							InfoSet 408Issue 1A
System Manual1 - 9
SECTION 7OUTSIDE LINE TYPE
The following outside line types can be used with the InfoSet 408 system.

2-wire, Loop Start Trunks

ISDN-BRI Trunks (2B)
DTU-32-1(  ) (BK)/(WH) TEL46 oz
(1304 g)4.8”
(123 mm)8.7”
(220 mm)9.3”
(235 mm)
DTU-32D-2 (BK)/(WH) TEL48 oz
(1361 g)4.8”
(123 mm)8.7”
(220 mm)9.3”
(235 mm)
DTP-1-1 (WH) TEL26.8 oz
(760 g)2.36”
(60 mm)6.22”
(158 mm)8.81”
(224 mm)
DTP-1HM-1 (WH) TEL26.8 oz
(760 g)2.36”
(60 mm)6.22”
(158 mm)8.81”
(224 mm)
DTP-2DT-1 (WH) TEL41 oz
(1163 g)4.8”
(123 mm)7.8”
( 197mm9.3”
(235 mm)
ETW-4R-1 (BK) TEL26 oz
(737 g)3.42”
(87 mm)5.51”
(140 mm)7.48”
(190 mm)
ESI(3)-B10 ETU4.59 oz
(130 mm)3.69”
(93 mm)5.44”
(138 mm).81”
(20 mm)
DTB-16-1 (BK)/(WH) TEL38.8 oz
(1100 g)9.13”
(231 mm)6.63”
(168 mm)3.38”
(86 mm)
DTB-16D-1 (BK)/(WH) TEL40.46 oz
(1180 g)9.13”
(231 mm)6.63”
(168 mm)3.38”
(86 mm)
HFU-U (BK)/(WH) Unit7.1 oz
(201 g)3.4”
(86 mm)4.2”
(107 mm)5.2”
(133 mm)
MIF-B10 ETU11.66 oz
(340 g)3.69”
(93 mm)5.44”
(138 mm).82”
(21 mm)
PBR-B10 ETU3.60 oz
(102 g)3.69”
(93 mm)5.44”
(138 mm).82”
(21 mm)
SLI(2)-B10 ETU6 oz
(170 g)3.69”
(93 mm)5.44”
(138 mm).94”
(24 mm)
SLT(1)-U10 ADP9 oz.
(255 g)1.8”
(45 mm)2.8”
(70 mm)4.8”
(120 mm)
VMS(2)-B10 ETU32 oz.
(907 g)5”
(127 mm)10”
(254 mm)8.5”
(216 mm)
WMU-U Unit10.6 oz
(301 g)4.1”
(104 mm)5.9”
(151 mm)7.1”
(180 mm)
*   Shipping weight includes the shipping carton.  
Weights and dimensions have been rounded to the nearest decimal.UnitShipping 
Weight*Height Width Depth 
						

							Issue 1AInfoSet 408
1 - 10System Overview
SECTION 8NETWORK AND CONTROL
8.1 Transmission, Network, and Control Specifications
8.1.1 Transmission

Data Length
From Multiline Telephone to ESI(3)-B10 ETU: 23 bits
From ESI(3)-B10 ETU to Multiline Telephone: 23 bits

Data Transmission Rates:
Between ESI(3)-B10 ETU and Multiline Telephone: 184K
bps (voice and signaling)

Scanning Time for each Multiline Telephone:  32 ms.
8.1.2 Network
Time Division Multiplexing allows transmission of a number of
separate data, voice and/or video simultaneously over one
communications medium.  The information below indicates the
specifications the InfoSet 408  system uses for switching, clock,
data bus, timeframe.

TDM Switching: PCM (µ Law)

TDM Clock: 2.048 MHz

TDM Data Bus: 8 bit

TDM Timeframe: 125 µs.
8.1.3 Control
This section indicates the speed and capacities of the control. 

Control:  Stored program with distributed processing

Central Processor:  8-bit microprocessor

Clock: 12.288 MHz

Sub-processor:  8-bit  microprocessor

Multiline Telephone:  8-bit microprocessor

SLT Adapter:  4-bit microprocessor
8.1.4 Telephone
The voltage, current, ring signal information for the InfoSet 408
multiline telephones, single line telephone equipment, and APR
units are listed below. 
						

							InfoSet 408Issue 1A
System Manual1 - 11 
Multiline Telephone
Voltage:   -11 ~ -26 Vdc
Maximum Current:  250 mA

Single Line Telephone
Standard 2500 Set:  500 type network
Nominal Current:  35 mA
Ring Signal:  56 Vac RMS @ 20 Hz

SLT(1)-U10 ADP
Standard 2500 Set:  500 type network
Nominal Current:  30 mA
Ring Signal:  56 Vac RMS @ 20 Hz

APR-U Unit
Standard 2500 Set:  500 type network
Nominal Current:  30 mA
Ring Signal:  70 Vac RMS @ 18 Hz
SECTION 9EXTERNAL EQUIPMENT CONNECTION
9.1 Music Sources for Music on Hold via KSU 

Auxiliary Input:   0.6V PPS Signal Level

Input Impedance:  600 


9.2 External Paging (Audio) via KSU

Output Power:  –10 dBm Signal Level

Output Impedance:  600 


Acoustical characteristics meet Electronic Industry 
Association (EIA) standard proposal SP-1286 and 
standard EIA RS-470.   
						

							Issue 1AInfoSet 408
1 - 12System Overview
9.3 External Tone Ringer

Output Level:  –10 dBm

Output Impedance:  600 



Relay Contact Rating:  1A, 24 Vdc 
9.4 SMDR Output

Male Connector (System Output) Standard RS-232C (DB-9)
9.5 PC Connection

Male Connector (System Output) Standard RS-232C (DB-9)
9.6 Relay Contact

All Relay Contact Ratings:   1A, 24Vdc
SECTION 10 BATTERY BACKUP
The InfoSet 408 system has battery backup functions for system backup and for
memory backup.
10.1 System Backup
During a power failure, the system is backed up using a rechargeable
battery.  This battery backup supports all system operations for
approximately 30 minutes.
10.2 Memory Backup
The B408-B10 KSU has a lithium battery installed to provide backup of
system memory.  The system memory (programmed data)
 is retained for a
minimum of two years. 
						

							System Manual2 - 1
Installation
 

SECTION  1 BASIC INSTALLATION
This section provides instructions for the basic installation of the system.  Before
the system is operational the backup battery must be attached, the lithium battery
that retains system memory must be installed, the memory backup switch must be
moved to the “Hold” position, and the system must be wall mounted.  
There are two standard configuration which can be expanded to a maximum of
four trunk lines (ports) and eight telephones by purchasing the necessary
expansion boards and installing them.  Instructions for installing the expansion
boards are provided in Section 2 Installing Electronic Telephone Units on page
2-10. 
1.1 Unpacking the KSU
Unpack the KSU from the box.   The contents include:

B408-B10 KSU

Wall Mounting Template

One-Sheet Installation Guide

4 Phillips Head Wood Screws

Speaker Relay Cable

Lithium Battery 

2 Replacement Fuses

2 Tie Wraps

InfoSet 408 System Manual (CD-ROM)
The tools needed include:

Phillips Head Screwdriver