Layer 1 Layer 2
Master
Clock
LED Pattern
ON ON OFF
ON OFF ON
ON ON ON
Layer 1: ON (Synchronous)
Layer 2: ON (Link established)/OFF (Link not established)
Master Clock: ON (Master)/OFF (Slave)
Maximum Cabling Distance of ISDN DSU Connection
The maximum length of the cable that connects the DSU and the PBX is shown below:
CAT 5: Under 1000 m
DSU
Point-to-Point
Maximum Cabling Distance of ISDN Terminal Equipment (TE) Connection
The maximum length of the extension cable that connects the PBX and the TE is shown below:
CAT 5: Under 1000 m
TE
Point-to-Point
152 Installation Manual
4.5.5 BRI4 Card (KX-NS5284)