Sage 925VST Installation and operating instructions

925VST-TestingThruWiFi+VoIPphones.wpd Page 1 of 6 jls August 17, 2005
SAGE INSTRUMENTS, 240 AIRPORT BLVD., FREEDOM, CA 95019-2614 Ph [phone] Fax [phone] www.sageinst.com
Sage 925VST Application Note
Testing Through WiFi and VoIP Phones
Introduction
This document describes how to interface a Sage 925VST Handheld VoIP Service Tester to a WiFi phone
or VoIP phone. It also includes a complete example of how to conduct an SMOS test.
Background
On classic analog telephone circuits, test equipment can be connected directly to the pair of telephone
wires that extend from the telephone central office to the customer's premises. The test equipment directly
substitutes the telephone set. This 2-wire interface is expected to have a known fixed test impedance of
about 600 ohms, no matter what phone line you connect to, and no matter what phone was being used.
There are also industry-wide expectations about the required transmit level (0 dBm). And with the fixed
interface impedance, it is very straightforward to accurately measure the receive level (nominally
-10 dBm)
Telephone circuits employing WiFi or VoIP phones, however, don't have this "standard" 2-wire interface.
Instead, the connection from phone to the "telephone central office" can employ 2 or more wires and any
of a number of transport protocols and modulation schemes. So, the most practical method of testing
through such phones is to connect to the "coil-cord" handset interface of a VoIP phone or the headset
interface of a WiFi phone.
These interfaces are inherently 4-wire (two wires for the microphone, and two wires for the earphone). In
WiFi phones, though,
you may find the
physical connections
consist of only three
wires. On such
connections, one lead
of the microphone and
one lead of the
earphone have been
joined as a "common"
lead.
Unfortunately, none
of these interfaces are
"standardized" with
respect to impedance,
transmit level, or
receive sensitivity. So,
this document will
also describe how to
adjust the 925VST
transmit level and
receive sensitivity as a
method to cope with
these variances.
IP NETWORK
925VST
IP PHONE
Y-MODULAR TEST ACCESS CABLE
SAGE PART NO. 2100-0237-01
Figure 1 — Connecting the 925VST to an IP Phone

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Connecting to a VoIP Phone
The recommended method of connecting a 925VST to a VoIP phone is via the phone's modular "coil-
cord" handset interface. You can use the Sage Instruments Y-modular test access cable, Part No.
2100-0237-01, as illustrated in Figure 1.
Note that each leg of the "Y" cable has a different type of modular connector. The thicker one is
terminated in a standard modular RJ11 telephone plug, and labeled "2W" (2-wire). The other is
terminated in a modular RJ22 plug, which is identical to the small modular connector at the end of a
telephone handset coil-cord. This leg is a thinner, flat cable and is labeled "4W" (4-wire).
Procedure:
1. Unplug the existing handset coil-cord cable from the VoIP telephone base unit
2. In its place, plug the "4W" RJ22 end of the "Y" cable
3. Plug the other end of the "Y" cable (a fat, wide RJ45 plug) into the matching jack at the bottom end
of the 925VST
Connecting to a WiFi Phone
The recommended method of
connecting to a WiFi phone is
through its headset jack.
Unfortunately, Sage does not offer a
custom cable for making this
connection, so you will have to
assemble one yourself. Figure 2
provides sufficient information to
construct an appropriate cable.
Procedure:
1. Plug the RJ45 end of the test
cable into the matching RJ45 jack
at the bottom of the 925VST
2. Plug the mini plug end of the test
cable into the matching jack on
the WiFi phone
925VST
8
1
RJ48/45 Male Plug
(Locking Clip on Bottom)
4-WIRE TX 7
2-WIRE TX, 4-WIRE RX 5
2-WIRE RX, 4-WIRE RX 4
4-WIRE TX 2
8
6
3
1
TO WiFi PHONE MICROPHONE (+)
TO WiFi PHONE EARPHONE (+)
TO WiFi PHONE EARPHONE (-)
TO WiFi PHONE MICROPHONE (-)
WiFi Phone
2260 ohm 1% 1/4 watt "sense"
resistor; required to mute WiFi
Phone internal speaker and
microphone, and inhibit switching to
speakerphone mode
Figure 2 — Connecting the 925VST to a WiFi Phone

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Configure for 4-Wire Dry Circuit Operation
1. Power up the 925VST. You should see a screen like the
illustration at the right
2. Press the NEXT key to see the Main Menu
3. Using the numeric keypad, press the "2" key to enter the
Setup area
4. Using the numeric keypad, press the "1" key to select the
Interfaces screen
5. Using the numeric keypad, press the "1" key to select Test
Interface
6. Press the down-arrow button to see additional choices
7. Using the numeric keypad, press the "2" key to select 4 Wire
Dry, which is the test interface necessary to connect to the
handset jack of an IP Phone, or headset jack of a WiFi phone.
You will see briefly displayed "Interface is 4W, Dry Mode"
Then, the display will return to the Select Interface screen,
with line 2 enclosed by "greater than" and "less than"
symbols.
8. Press the BACK key three times to return to the Main Menu
Sage Instruments
925VST 2.9001
2 Wire Mode
Hit Next to Continue
Main Menu 1 9
1:<Test>
2:Setup
3:View Results
1:<Interfaces>
2:Environment
3:Phone Lists
4:Responder Mode
Interfaces
1:<Test Interface>
2:Serial Port
Select Interface 1 9
1:<2W Loop 600>
2:2W Loop 900
3:2W Gnd-Start 600
Select Interface 28
1:2W Gnd-Start 900
2:4 Wire Dry
Interface is 4W,
Dry mode
Select Interface 28
1:2W Gnd-Start 900
2:<4 Wire Dry>

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Configure the SMOS Director Function
1. Using the BACK and NEXT keys, navigate to the Main
menu
2. Using the numeric keypad, press the "1" key to select Test
3. Using the numeric keypad, press the "1" key to select SMOS
Director
4. Using the numeric keypad, enter the phone number of the
telephone this 925VST is connected to. This information will
be included in the test result logs saved by the 925VST.
Note: The following steps 5 through 13 are optional, but are
included to acquaint you with the available user-adjustable
parameters
5. Press the F2 key to display additional setup options
6. Use the numeric keypad to enter 1, 2, 3, or 4. Pressing 4sets
all three parameters to factory default values. Let's assume
you want to view or modify each of these parameters. Press
the "1" key to select Voice Duration.
This parameter defines how long the SMOS artificial voice
signal will last in each test direction. Default is 9 seconds. On
poor quality circuits (i.e. with significant frame slips, and
frame losses), a longer artificial voice duration will yield
more accurate results. In such cases, Sage recommends
setting the artificial voice duration to 30 seconds or more.
7. After you have made any desired adjustment, press the
NEXT key to "enter" your input and return to the previous
setup screen
Main Menu 1 9
1:<Test>
2:Setup
3:View Results
Test Select 1 9
1:<SMOS Director>
2:Echo Sounder
3:PVIT Send/Meas
Phone # Under Test,
<SETUP>
Phone # Under Test,
8315551212
<SETUP>
1:<Voice Duration>
2:TX TLP
3:RX TLP
4:Set to Default
SMOS Artificial
Voice Duration
9 Seconds
Enter 3 to 60
SMOS Artificial
Voice Duration
9 Seconds
Enter 3 to 60
1:<Voice Duration>
2:TX TLP
3:RX TLP
4:Set to Default

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8. Using the numeric keypad, press the "2" key to select TX
TLP. Use the numeric keypad to modify the displayed value.
You can use the transmit (TX) TLP to adjust the 925VSTs
test signal level up or down. Handset and headset interfaces
are often too sensitive for the "0 dB" transmit level setting, so
Sage suggests starting with a setting of -10 dB to -20 dB.
9. After you have made any desired adjustment, press the
NEXT key to "enter" your input and return to the previous
setup screen
10. Using the numeric keypad, press the "3" key to select RX
TLP. You can use the receive (RX) TLP to adjust the
925VSTs receive sensitivity. Default is 0 dB. To increase
sensitivity, LOWER the RX TLP.
11. After you have made any desired adjustment, press the
NEXT key to "enter" your input and return to the previous
setup screen
12. Let's assume you've changed your mind, and want to reset all
three parameters to factory defaults: Using the numeric
keypad, press the "4" key to select Set to Default
13. Press the NEXT key to "enter" your input and return to the
previous setup screen
14. Press the BACK key to continue the main series of SMOS
setup screens. This will take you back to the last main setup
screen you saw
15. Press the NEXT key to move to the next SMOS setup screen
SMOS TX Level Point
0 dB
Enter -30 to 10
Next to continue
1:Voice Duration
2:<TX TLP>
3:RX TLP
4:Set to Default
SMOS RX Level Point
0 dB
Enter -30 to 10
Next to continue
1:Voice Duration
2:TX TLP
3:<RX TLP>
4:Set to Default
Voice Duration: 9s
TX TLP: 0dB
RX TLP: 0dB
NEXT to continue
1:Voice Duration
2:TX TLP
3:RX TLP
4:<Set to Default>
Phone # Under Test,
8315551212
<SETUP>
Enter Your ID
Numeric <Alpha>

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16. The intent of the ID field is to identify the tester who ran the
tests. This information will be included in the test result logs
saved by the 925VST.
If your ID consists of strictly numbers, press the F1
(Numeric) key and use the numeric keypad to enter them.
If your ID consists of letters, or a combination of numbers
and letters, press the F2 (Alpha) key, and use the numeric
keypad to enter them. Notice that each numeric key also has
two or three letters. Repeatedly pressing a key will cycle
through each letter and the number on the key. Then, the
cursor will advance on space to be ready for the next
character you input.
17. After you have input your ID, press the NEXT key to move
to the next SMOS setup screen
18. The intent of the Order field is to identify the work order,
sales order, repair order, or any other desired tracking
number. Such a number, for instance, could be used to relate
the test results with a circuit installation or repair job.
19. After you have input your Order number, press the NEXT
key to move to the next SMOS setup screen
20. With IP and WiFi phones, you need to dial the destination
phone number by using the phone's dial pad, so do not enter
any digits in this window. Instead, press the NEXT key to
advance to the next screen. This screen will prompt you with
the message "Go off hook and Dial, The Press Next."
21. Using the IP or WiFi phone, make the call as you normally
would if the 925VST was not connected to it. Then, press the
NEXT key. The 925VST will then briefly display a
"connecting" message, which changes to a "Test in Progress"
message.
22. At completion of the test, use the IP or WiFi phone to hang
up and terminate the call.
This Application Note is made available as a courtesy to our customers, in the hope it will be helpful.
However, it is provided "as is" without warranty of any kind, either express or implied.
Enter Your ID
JSMITH3416
Numeric <Alpha>
Enter Order #
Numeric <Alpha>
Enter Order #
112301BA
Numeric <Alpha>
Manual # Entry 0 9
#:
<Dig Setup>
Go off hook and Dial
Then Press Next
SMOS Director 4W
Test In Progress
Please wait...