Zhone Technologies Z-PLEX-10-24-DOC-SC Manuel D’Utilisation
Zhone Technologies / 5-1
Diagnostics
T1 loopbacks
Chapter 5
Diagnostics
Diagnostics
This chapter describes how to perform loopbacks on the Z-Plex unit interfaces. It also
describes the system’s LEDs. It includes the following topics:
describes the system’s LEDs. It includes the following topics:
5.1
T1 loopbacks
The T1 interfaces support local and line (network) loopbacks:
•
During a line (network) loopback, the signal is looped back to the network. The receive
T1 signal is looped onto the transmit T1within the framer chip.
T1 signal is looped onto the transmit T1within the framer chip.
•
During a local loopback, the signal is looped back to the user. The transmit T1 signal is
looped onto the receive T1within the LIU.
looped onto the receive T1within the LIU.
The Z-Plex unit supports ESF loopback detection sent from remote equipment. These codes
are ANSI T1.403 compatible with DS1 networks and allow the unit to detect a latching
loopback to remote DS1 equipment. The Z-Plex detects payload loopback (PLB), network
loopback (NLB), and line loopback (LLB). The Z-Plex also supports TR 54016 for loop up
and loop down cases.
are ANSI T1.403 compatible with DS1 networks and allow the unit to detect a latching
loopback to remote DS1 equipment. The Z-Plex detects payload loopback (PLB), network
loopback (NLB), and line loopback (LLB). The Z-Plex also supports TR 54016 for loop up
and loop down cases.
Figure 5-1 on page 5-2 illustrates T1 loopbacks on the Z-Plex unit.