Alpha Telecom UT3620 Triple NT1 User manual

UT3620 Triple NT1
Installation Guide

Revision 1.03
8/14/2008
UT3620 Triple NT1
Installation Guide
Information in this guide is subject
to change without notification.

Copyright 2000-2008Alpha Telecom, Inc. U.S.A.
This document may only be distributed, in printed or
electronic form, by Alpha Telecom, or by
authorized by Alpha Telecom.
parties

Table of Contents
Important Safety Instructions
Introduction
Package Contents
Front Panel
Rear Panel
Wiring Instructions
FCC Notice
ETL/ETLC Notice
Industry Canada Information
Metallic Loop Test (MLT)
Notes
Wall Mounting Template
Appendix A: DIP Switch Positions
Appendix B: S/T Bus Configuration
Appendix C: Interface Pin Assignments
Appendix D: Power Source 2 (PS2)
Appendix E: Acronyms
i
1
1
2
2
3
7
13
14
15
15
15
16
17
19
8
12
Figures
Figure 1: UT3620 Perspective View
Figure 2: UT3620 Rear Panel
Figure 3: Interface Wiring Diagram
Figure 4: Power Connector
Figure 5: U-Interface Connector
Figure 6: S/T-Interface Connector
Figure 7: DIP Switches
Figure 8: Default S/T Configuration
Figure 9: Short Bus Configuration
Figure 10: Extended Bus Configuration
Figure 11: Y-Bus Configuration
2
2
3
4
4
6
7
8
9
10
11
Tables
Table 1: DIP Switch Position
Assignments
Table 2: S/T-Interface Pin Assignments
Table 3: U-Interface Pin Assignments
Table 4: Power Connector Pin
Assignments
Table 5: Power Supply Information
7
12
12
12
13

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Important Safety Instructions
If you experience technical difficulty with the UT3620
please contact Alpha Telecom at 408-895-1806or
[email protected] for technical support.
Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the
jack is specifically designed for wet locations.
Never touch uninsulated telephone wires or terminals
unless the telephone line has been disconnected at the
network interface.
Use caution when installing or modifying telephone lines.
Do not use this product near water, for example, near a
bath tub, wash bowl, kitchen sink, or laundry tub, in a wet
basement or near a swimming pool.
Avoid using a telephone (other than a cordless type)
during an electrical storm. There may be a remote risk of
electric shock from lightning.
Do not use the telephone to report a gas leak in the vicinity
of the leak.
Use only the power supply indicated in this manual.
Caution - For continued protection against risk of fire,
replace only with same type rating of fuse “F3, F6, F9 and
F12", 125V, 1.0A, located on printed wiring board.
The registration jack USOC, Facility Interface codes, and
Service order codes are as follows: USOC, RJ49C; FIC,
02IS5; SOC, 6.0N.
SAVE THESE INSTRUCTIONS

Introduction
The Alpha Telecom UT3620 NT1 is a
compact, versatile, and affordable Network
Termination 1 (NT1) device for connecting
Terminal Equipment (TE) to the Integrated
Services Digital Network (ISDN).
This installation guide describes how to install
the UT3620 for use with Video Conferencing
Equipment and ISDN Telephones.
Package Contents
One UT3620 NT1
Three RJ-45 to RJ-45 cables
Three RJ-11 to RJ-45 hybrid cables
Six wire ties for cable management
One power supply (16Watt or 40Watt)
Manual
Warranty Card
Wall-Mounting Kit
Triple
Triple
1UT3620 Triple NT1 Installation Guide

Front Panel
Figure 1 shows the UT3620 in perspective view
to show all of the LEDs and labels. There is a
position for an extra LED at the far left which is
not used in this model. There are four LEDs in
the front panel of the UT3620. Each of the first
three LEDs from the left indicates the status of
the labeled interface. The last LED indicates the
power status of the UT3620.
Rear Panel
The UT3620 rear panel shown in Figure 2 has
nine RJ-45 connectors: three U-Interfaces and
six S/T-Interfaces from left to right. It also has a
barrel type power connector and a wire clip.
Figure 2. UT3620 Rear Panel
Figure 1. UT3620 Perspective View
2UT3620 NT1 Installation GuideTriple

Wiring Instructions
Figure 3 shows the wiring diagram of the
UT3620 with the ISDN TE and the ISDN
U-Interface. Specific step-by-step instructions
follow.
Figure 3. Interface Wiring Diagram
Video Conferencing Equipment
or ISDN Telephones
U3U1 U2 S/T1 S/T2 S/T3
40V DC
Power
ISDN Service
3
Step 1: Adjust the DIP Switches on the bottom of
the UT3620 for the desired S/T Bus
Configuration. Please refer to Appendix A: DIP
Switch Positions, Page 7, and Appendix B: S/T
Bus Configuration, Page 8, for details.
The manufacturer’s default DIP Switch
configuration will work for a majority of
installations. Adjustments should only be made
if the configuration is an exception as mentioned
in the Appendix B.
UT3620 Triple NT1 Installation Guide

Step 2: Connect the DC power plug of the power
supply to the power connector on the rear of the
UT3620 as shown in Figure 4. Place the power
cable into the wire clip to secure it.
Plug the power supply into an AC power outlet.
The Power LED will illuminate green and stay
solid indicating the UT3620 has power. The Line
Status LEDs will flash green once to indicate
each interface is receiving power.
If any of the LEDs do not illuminate appropriately,
repeat this step to verify all connections are
secured. If the symptom persists, contact
technical support for assistance.
Step 3: Connect the RJ-45 end of the hybrid
cable provided to the U-Interface connector on
the UT3620 as in Figure 5, then connect the
RJ-11 end of the hybrid cable to the U-Interface
outlet.
Figure 4. Power Connector
Figure 5. U-Interface Connector
4UT3620 NT1 Installation GuideTriple

The Line Status LED will flash green eight times
per second while synchronizing with the ISDN
line, then once per second to indicate the
U-Interface has synchronized. Repeat this step
for the remaining U-Interfaces.
If the LED does not flash at all, or does not slow to
once per second, there could be a problem with
the ISDN line. To verify the ISDN line, try a
different U-Interface port, preferably one that is
known to work. If the ISDN Line in question fails
on the working port, try verifying the cable has
connected solidly or try an RJ-45 to RJ-45 cable.
An alternative test is to plug a known working
ISDN Line into the U-Interface port that is in
question. If the working ISDN Line works on the
U-Interface port in question, then try the steps
above for verifying the ISDN Line in question.
If the U-Interface port fails with the known good
ISDN Line, or the ISDN Line works on another
port, contact technical support.
Step 4: Connect one end of the RJ-45 to RJ-45
cable provided to one of the S/T connectors on
the UT3620. Connect the other end to the TE.
This is illustrated in Figure 6 on the next page.
The Line Status LED will illuminate solid green
indicating that the TE has synchronized with the
ISDN line. Repeat this step for the remaining
S/T-Interfaces.
5UT3620 Triple NT1 Installation Guide

6
Step 5: Use the wire ties supplied with the
UT3620 and group the U-Interface cables
together followed by the S/T-Interface cables.
Alternatively, group each U-Interface and
corresponding S/T-Interface cables.
When the installation is complete, all LEDs
should stay solid green. Once this is
established, the UT3620 is fully functioning.
Congratulations! You have now
completed installation of your
UT3620 Quad NT1!
If the LED continues to blink slowly, the TE has
not synchronized. Note: Video Conferencing
products often require the software to be
operating to achieve synchronization. Check the
RJ-45 to RJ-45 cable connections, and verify
both RJ-45 ports for the S/T-Interface. Also,
verify the S/T Bus Configuration is correct for the
installation.
If these steps do not help, try moving a known
working S/T-Interface to this port, preferably from
an adjacent S/T-Interface port. If the LED still
does not indicate synchronization, call technical
support.
Figure 6. S/T-Interface Connector
UT3620 NT1 Installation GuideTriple

Appendix A: DIP Switch
Positions
There are three sets of five DIP Switches on the
bottom of the UT3620 as shown in Figure 7,
each corresponding to the appropriate line.
“0”, “50”, and “100” are the S/T bus TR settings in
Ohms. Most equipment requires 100 Ohm
termination. Any TE requiring 50 Ohm
termination will state such in its documentation.
The S/T bus timing is the most significant setting
for the short (fixed timing) or extended (adaptive
timing) bus configurations, and the terms are
often incorrectly equated.
Details of each DIP Switch are given in Table 1.
The asterisks represent the default positions.
The
DIP Switches allow the user to adjust the S/T bus
Terminating Resistor (TR) and S/T bus timing.
Setting
0
50
100
Adaptive
Fixed
1
---
---
---
Off*
On
2
Off
On
Off*
---
---
3
Off
On
Off*
---
---
4
Off
On
On*
---
---
5
Off
On
On*
---
---
7
Table 1. DIP Switch Position Assignments
Figure 7. DIP Switches
UT3620 Triple NT1 Installation Guide

Appendix B: S/T Bus
Configuration
Combinations of these settings and the wiring
requirements of the installation determine the
configuration for each line. Each S/T-Interface is
configured separately to provide flexibility.
Default Configuration:
The manufacturer’s default DIP Switch
configuration will work on almost all installations.
No more than four terminals can be attached and
each terminal must be the same distance away
from the NT1, within 10 meters tolerance, to a
maximum of 200 meters divided by the number
of terminals. For example two terminals could
be 85m and 95m from the NT1 respectively.
ON
OFF From is 200mNT1 to TE
Figure 8. Default S/T Configuration
Alternative Configurations:
There are three configurations for which the
defaults are not the ideal settings. Each is
detailed with examples and the appropriate
configuration.
8UT3620 NT1 Installation GuideTriple

Short Bus Configuration:
This covers cases where there are unknown,
random, or uneven distances between the NT1
and TE. This requires more than one TE, and
the distance between the TE and the NT1 must
be greater than 10 meters. For example, there
are four terminals arranged as in Figure 9 below.
Solution: Verify the distance between any two
terminals is at most 50 meters. The farthest
terminal must be within 200 meters of the NT1,
and it must have its own TR (or have a TR wired
into the line just before the terminal). Up to eight
terminals can be supported in this configuration.
TE with TR
From NT1 to last TE is 200m
ON
OFF
Figure 9. Short Bus Configuration
9UT3620 Triple NT1 Installation Guide

Extended Bus Configuration:
This covers cases where more than 200 meters
is required between the NT1 and the TE.
Solution: Wire a TR a fixed distance from the
NT1, or if only one terminal is needed, turn on a
built-in TR. If a TR is wired into the line, up to four
terminals can be supported as long as each is
within 25 meters from the TR.
With only one terminal, the maximum distance
from the NT1 to the TR is 1300 meters. The
maximum distance is reduced to 1000 meters
with two to four terminals as in Figure 10 below.
A variation of this method, called the Y-Bus
Configuration, allows the use of two equally
distant TR. More details about this configuration
are in the next section, “Y-Bus Configuration”.
From NT1 to TR is 1000m
ON
OFF
Figure 10. Extended Bus Configuration
TR
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Y-Bus Configuration:
This covers cases where more than 4 terminals
are required. An example is shown in Figure 11.
Solution: Wire two equally distant TR a
maximum of 140 meters from the NT1, within a
10 meter tolerance. Each TR can support up to 4
terminals, and terminals must be within 25
meters of a TR. No TE symmetry is required, so
one TR can have four terminals connected while
the second only has one.
From NT1 to TR is 140m
ON
OFF
Figure 11. Y-Bus Configuration
TR
TR
11UT3620 Triple NT1 Installation Guide

Appendix C: Interface Pin
Assignments
Each interface has specific pinouts which are
important for electricians and technicians to
know. Anyone installing wiring for the UT3620
should pay close attention to this information. All
interfaces described here are located on the rear
panel of the UT3620.
Table 2. S/T-Interface Pin Assignments
Table 4. Power Connector Pin Assignments
Table 3. U-Interface Pin Assignments
Pin Function Pin Function
Pin Function Pin Function
1
3
5
7
2
4
6
8
---
RX+
TX-
RTN
---
TX+
RX-
+40V
1
3
5
7
2
4
6
8
---
---
RING
---
---
TIP
---
---
Pin Function Pin Function
1+40V 2GND
12 UT3620 NT1 Installation GuideTriple

Appendix D: Power Source 2
(PS2)
The UT3620 is powered by an AC power supply
included with the unit. There are two options - the
16 Watt power supply or the 40 Watt power
supply.
The 16 Watt power supply can provide up to 16
watts of Power Source 2 (PS2) power. This power
supply is normally used for Video Conferencing,
Data Equipment, or fewer low-power ISDN
Telephones.
The 40 Watt power supply provides up to 40 watts
of PS2 power and is used for multiple ISDN
Telephones on all lines.
PS2 power is commonly used to power TE from
the NT1. Most data devices, such as Video
Conferencing units, do not require PS2 to
function.
Most ISDN Telephones, including those with built
in data capabilities, require PS2 power. The
specifications or documentation of the TE will
have information on the watts required by the
device.
Table 5. Power Supply Information
Unit Input Output
16 Watt +48VDC@250mA
+42VDC@1A
40 Watt
13
120VAC@60Hz
90~264VAC@50~60Hz
UT3620 Triple NT1 Installation Guide

Appendix E: Acronyms
A (mA) Amp (milli-Amp)
AC Alternating Current
DC Direct Current
DIP Dual In-line Package
Hz Hertz
ISDN Integrated Services Digital Network
m meters
MLT Metallic Loop Test
NT1 Network Termination type 1 device
PS2 Power Source 2
TE Terminal Equipment
TR Terminating Resistor
V Volts
VAC Volts AC
VDC Volts DC
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