Transaction Language 1 (TL1) is an ASCII or man-machine management
protocol used for managing Telecommunication networks.
TL1 facilitates communication between a managed device (a
device with TL1 agent) and a TL1 manager. The TL1 agent on
the managed device provides access to data stored on the managed
device. The TL1 manager uses this access to monitor and control
the managed device.
2.Why TL1 is important in telecommunications
network management?
RBOCs (Regional Bell Operating Companies) account for two-thirds
(US$ 20 billion) of the total US telecom market. All of them
use Telcordia's OSS software suite. OEM vendors who wants
to sell their equipment to the RBOCs have to support TL1 interface
in their telecom equipment and obtain an OSMINE-compliant
certificate for their device/EMS from Telcordia. (This is
a strict regulation by RBOCs). So OEM vendors who support
TL1 interface in their equipment have greater marketability
and scalability in North America telecommunications market.
An input command message is a message from
an OS or other source to a Network Element (NE). The message
requests the NE to perform some operations-related action.
An output response message is a detailed reply (or
set of replies) to an input command message. It contains the
data that needs to be returned to the OS/user and the information
indicating whether the command was executed successfully.
An Autonomous message is sent from the NE to the
appropriate OS without having an explicit input message associated
with it. Typical scenarios where autonomous messages are used
include the following:
Reporting of alarmed or non-alarmed trouble events.
Reporting of scheduled diagnostic tests in the NE.
8.Is it necessary to have a manager application
to manage TL1 device?
No. One of the major advantages of TL1 over other management
protocol is, TL1 is man-machine and machine-machine language.
So TL1 device can be managed from Command Terminal Interface
(CTI) as well as from OSS (Operation Supporting System).
