Section 18: Data Transfer & Using 3
rd
Party Devices
T
ieline
T E C H N O L O G Y
Page 146
Section 18.
Data Transfer & Using 3
rd
Party Devices
This section discusses the data sending options available when using
T
ieline
codecs.
First we look at the session data that is sent between codecs when they first connect.
We also explore the data sending capabilities of codecs for remote controlling audio
channels and for sending data used to control third party devices.
18.1.
Data Options Available
Every connection includes a minimum of 50 bytes per second in a remote control
channel to provide
T
ieline
Tool
Box
capabilities, and which can be also used to
control specific
T
ieline
external devices, i.e. external relay boxes.
If your codec is captioning-enabled, please see the captioning reference manual
for more information on data transfer and setting your codec up.
For specific GSM data information, please see the section in this reference
manual titled GSM Transparent and Non-transparent Data Modes.
18.2.
The Serial Port Data Wizard
A codec serial port can be configured to send data by pressing
SOFTKEY 4
and
then using the
MENU SELECTOR (MS)
to scroll to and select [Configuration] >
[Advanced Menu] > [Serial Port Mode] > [Data]. A wizard will then ask an
operator to confirm the following:
1.
The serial port data rate setting (default is 9600); and
2.
Whether to enable serial port flow control, allowing a device connected to
the codec to regulate the flow of data (default is enabled);
These elements are discussed in more detail later in this section of this reference
manual.
18.3.
An Introduction to Session Data
The information that follows provides relevant information about how session
data is used when sending data between
T
ieline
codecs. We will also discuss the
implications of connecting a
T
ieline
codec to a non-
T
ieline
codec. Before
discussing session data in detail it is useful to outline some information on data
packets and the OSI (Open System Interconnection) model of computer
communications. This provides an understanding of where session data sits in
relation to computer network protocol design.
18.4.
Some Background on Data Packets
Circuit switching, as used in GSM CSD and HSCSD connections, creates a
dedicated connection between two nodes (in this case cell-phones) to send data
exclusively between these two devices.
Packet switching, as used in computer networks and increasingly in
telecommunications devices (i.e. 3G cell-phones), is where data packets can be
individually routed between two nodes (in our case two codecs) over shared LAN
and WAN connections.
