Appendix D PRI Technical Notes
ViewStation FX/VS 4000 User’s Guide 190 www.polycom.com
Note If the PRI network interface module is connected to an
external power source, the green LED should come on after
several seconds, even if the peripheral link cable is not
connected.
PBXs
The following provides information about PBXs.
• Some PBXs require a crossover cable.
• Because the PRI network interface module does not generate a
clock signal to the network, the PBX must be capable of
providing the clock signal.
• Because the PRI network interface module acts as customer
premise equipment (CPE), the PBX must be able to act as the
network side for layers 1, 2, and 3.
• A PBX that is configured correctly should accept a numbering
type of UNKNOWN in calls from the PRI network interface
module. The failure of the PBX to do this might indicate a
configuration problem. For more information, see the section
Advanced PRI Setup below.
• QSIG signaling, known as PSS1, is not supported. However, a
PRI network interface module can be connected to a PISN
through a gateway using ordinary ETSI DSS1 signaling.
Switch Protocols
The selection of valid switch protocols depends on both the country
and PRI network interface module type, which is either T1 or E1.
For E1, NET5/CTR4 is the default. NET5/CTR4 is the standard ETSI
protocol derived from ITU Q.931.
Solid amber LED and solid
green LED
A DRAM upload of new
microcode has been completed
and is being burned into flash.
Solid green LED
The PRI network interface
module is fully booted.
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