ClearOne comm XAP 400 operation manual Expansion bus, Introduction ~ Networking

6 Introduction ~ Networking

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The latency or propagation delay is <1ms.

H. Speaker. This is a 10W power amp connector. A 4–16Ωspeaker can be directly connected to the XAP 400, eliminating the need for an external power amplifier.

I.Telco Line. This RJ-11 connector provides connection of a standard analog telephone line to the hybrid.

J.Telco Set. This RJ-11 connector allows connection to a standard telephone set. Tip and ring from the phone line are present at this connector when the hybrid is off. Tip and ring from the phone line are not present at this point when the hybrid is on.

K.RS-485 Remote Panel A/B Port. These four-pin Phoenix connector ports allow you to control the XAP 400 with the ClearOne Control Panel or XAP IR Remote.

Power is supplied through the RS-485 ports to the remote Control Panels from the XAP 400. This power is limited to a total of 300mA at 15 volts for each connector. Over-current protection is provided on the +15V pins to prevent damage in the event of shorting. External power can be provided to control devices when more current is required. See page 100 for maximum cable run distances when using ClearOne Control Panels.

Networking

Expansion bus

The digital mix-minus expansion bus (RJ-45 LAN) is used to connect up to eight XAP 800/400s and 16 XAP TH2 units, where the total number of microphone inputs does not exceed 64. The maximum distance between interconnected XAP 800/400 or PSR1212 units is 80 feet (24 meters). Connecting a XAP TH2 must not increase the cable length between two PSR1212s, XAP 800s and/or XAP 400s beyond 80 feet. ClearOne recommends that category five twisted-pair (10BaseT LAN) cable be used.

The expansion bus (E-bus) allows audio routing between destinations on the E-bus network. The E-bus contains 12 independent digital audio buses labeled O–Z which can route mic or line level inputs in any combination across the E-bus network. The O–Z buses are divided into two groups (O–R and S–Z) based on their capabilities and default settings. The E-bus also contains four PA adapt/acoustic echo cancellation reference buses, four global gating buses, and one control bus.

•O–R buses. These four audio buses are defaulted as the mic mix buses; they can communicate the NOM count and mic mixing parameters across the network to other XAP 400s. All gated mics are routed to the 0-bus by default.

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