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61200659L1-1 MX2800 STS-1 User Manual 9-1
Chapter 9
Transaction Language 1 (TL1)
INTRODUCTION
Transaction Language 1 (TL1) is a BELLCORE standard used in
the input and output messages that pass between Operations
Systems (OS) and Network Elements (NE) in telecommunication
networks. It was developed to standardize equipment surveillance
and memory administration, and to test with a common format.
This release of TL1 primarily supports the interactive and
autonomous retrieval of system events as part of a valid TL1
session.
OVERVIEW
TL1 is an ASCII-based language that supports both command-
response and autonomous (NE) message generation. Commonly,
TL1 is used over a X.25 packet network but is completely
independent of any physical layer protocols. For the
MX2800 STS-1, TL1 is implemented as a Telnet session running
over either Ethernet or PPP.
Currently, up to eight simultaneous TL1 Telnet connections can be
active. To manually bring up a TL1 Telnet connection, a Telnet
client is used to request a connection on (TCP) port 3116. A
successful connection will require that the MX2800 STS-1 be
properly configured to operate via the LAN or modem. For
example, in the LAN case, the MX2800 STS-1 must have the LAN