ISDN ANALYZER D1080 - messkom.de

USER’S MANUAL REV. 5 ISDN ANALYZER D1080
8. MONITORING THE PHYSICAL LEVEL
Regardless from the selected operating mode, the instrument
monitors and displays information about the physical level of the
tested line.
The groups of LED’s located in the front part of the instrument
supply information about the state of the physical level of the
connection, according to the type of access (either Basic or
Primary).
The LED’s located in the left column, marked as “TO TE", supply
information about the Network → Terminal flow, while the LED’s
located in the right column, marked as "TO NT", supply
information about the Terminal → Network flow.
When the TE TEST mode is set, the instrument does not act as a
user terminal, but as “NT”. In this case the meaning of the
columns is reversed: the LED’s marked as “TO TE” refer to the
Instrument → Terminal flow, while the LED’s marked as “TO NT”
refer to the Terminal → Instrument flow.
The instrument can be set to act as monitor in high impedance
between network and user terminal, both in Basic and Primary
Access.
To do this, select the MONITOR mode in the CONFIGURATION
page (see Chapter 7).
In this way the SIGNALLING PROTOCOL ANALYZER function can be
accessed as well (see Chapter 10).
CHAPTER 8. MONITORING THE PHYSICAL LEVEL 63