ADTRAN Express 3000 SP Información técnica descargar pdf (Pagina 93)

Chapter 4 - Installing Videoconferencing Systems

If You Are Connecting to a PBX

❑ Some PBXs require a crossover cable.

❑ The PBX must provide the clock signal and act as the network

side for layers 1, 2, and 3.

❑ QSIG signaling (PSS1) is not supported. However, a PRI

network interface module can be connected to a PISN through a

gateway using ETSI DSS1 signaling.

Cables Used with the PRI Network Interface Module

The following cables may be used with the PRI network interface

module.

❑ Peripheral link cable: The peripheral link cable does not fit into

a standard RJ-45 network port. You can, however, use it to

connect any Polycom network interface module to the system.

❑ PBX crossover cable: An RJ-45 crossover cable may be required

when connecting the PRI network interface module to a PBX or

other third-party network access device.

❑ PRI Cable extension: You can purchase a cable adapter kit to

extend the distance between your system and the PRI network

interface module.

❑ 75 Ω coaxial adapter: The PRI E1 line termination is 120 Ω. In

some areas, however, the E1 network connection is via a 75 Ω

coaxial cable. The PRI network interface module does not

directly support this, but you can obtain passive adapter

devices from various vendors.

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ADTRAN Express 3000 SP Información técnica Pagina 93