TR41.3.1 / 02 - 05 – 009
Embedded Systems Products
Standards Project: SP-4078RV (TIA-777-A)
Title:
Step like voltage and FSK message examples
Source:
Embedded Systems Products Inc.
#208 5010 4th St. NE
Calgary, AB T2K 5X8
Contact:
Leonard Bleile, Chris Becker
(P) (403) 516-0700
(F) (403) 516-0744
Email:
Date:
Distribution to:
lbleile@espi.ca
April 30, 2002
TIA TR-41.3.1
ABSTRACT
This contribution proposes the inclusion of an FSK message example as well as a step like
voltage waveform example into informative annexes to the document.
Notice: This submission has been prepared to assist Working Group TIA TR-41.3.1 This document is offered to
the working group as a basis for discussion and is not a binding proposal on Embedded Systems Products which
reserves the right to change the information at its discretion as required without notice to the committee. The
information may be subject to change in form and numerical value after more study. Specifically, the right to add
to, amend, or withdraw the statements contained herein is reserved by Embedded Systems Products.
Copyright Notice
The contributor grants a free, irrevocable license to the telecommunications Industry Association (TIA) to
incorporate text contained in this contribution and any modification thereof in the creation of a TIA standards
Publication, to copyright in TIA’s name any Standards Publication even though it may include portions of this
contribution and at TIA’s sole discretion to permit others to reproduce in whole or part the resulting TIA standards
publication.
Page 1 of 5
TR41.3.1 / 02 - 05 – 009
Embedded Systems Products
BACKGROUND
A previous contribution (TR41.3.1-05-01-11 “Step-Like Voltage Changes”) documented field
measurements of step-like voltage changes associated with FSK signaling. This contribution
proposes the addition of a measured signal to serve as an example of a step like voltage
condition observed on a line. This contribution also proposes to add an annex to illustrate
example FSK messages.
PROPOSAL
1. Add the following diagram to the informative annex D “Examples of step like voltage
changes. This is an example of line voltages observed on a line during testing. It
shows a Type 1 caller ID transmission. The sequence of events is an OSI, Level shift,
Ring burst, Line Reversal, level shift during FSK and then a final Line Reversal. This
capture also shows that there is significant noise on the line in the on hook state
preceding the Ring burst and following the FSK burst. The noise is not present during
the FSK transmission. God help us.
Page 2 of 5
TR41.3.1 / 02 - 05 – 009
Embedded Systems Products
Page 3 of 5
TR41.3.1 / 02 - 05 – 009
Embedded Systems Products
2. Add the following tables to an informative annex E “Examples of FSK messages”
There are other standards (BT, Taiwan etc) that include examples of FSK messages. These
are useful to indicate how a typical message is constructed.
Example of an MDMF Call Setup message with Time & Date, Calling Name and Calling Number
(April 30, 11:11am, 555 1212, Sarah M. Smith)
Message Type
Message Length
Parameter Type
Parameter Length
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter Type
Parameter Length
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter Type
Parameter Length
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Checksum
Call Setup
23 bytes (3510)
Date & Time
8 bytes
0
4
3
0
1
1
1
1
Calling Number
7 bytes
5
5
5
1
2
1
2
Calling Name
E bytes (1510)
S
a
r
a
h
M
.
S
m
i.
t
h
97
80
23
01
08
30
34
33
30
31
31
31
31
02
07
35
35
35
31
32
31
32
07
0E
53
61
72
61
68
20
4D
2E
20
53
6D
69
74
68
97
Page 4 of 5
TR41.3.1 / 02 - 05 – 009
Embedded Systems Products
Example of an MDMF Call Setup message with Time & Date, Private Name and Private Number
(April 30, 11:30am, Private Number, Private Name)
Message Type
Message Length
Parameter Type
Parameter Length
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter data
Parameter Type
Parameter Length
Parameter data
Parameter Type
Parameter Length
Parameter data
Checksum
Call Setup
10 bytes (1610)
Date & Time
8 bytes
0
4
3
0
1
1
3
0
Reason for absence of Directory Number
1 byte
P
Reason for absence of Calling Name
1 byte
P
2D
Page 5 of 5
80
23
01
08
30
34
33
30
31
31
33
30
04
01
50
08
01
50
2D