ClearOne comm SR 1212, PRO TH20, PRO 8I Expansion Bus Connections, Audio and Control Buses

Chapter 2: Expansion Bus & LCD Programming

Expansion Bus

The Expansion Bus (E-bus) allows you to connect multiple Converge/Converge-Pro units together to create powerful audio and conferencing solutions for any size venue. The E-bus is a proprietary digital audio bus that provides control and audio data links between devices.

Expansion Bus Connections

Using the E-bus Link In and Link Out ports, you can connect up to 34 Converge Pro 880/880T/880TA/840T/8i and Converge SR 1212/SR 1212A units, and up to 16 Converge Pro TH20 units, where the total number of microphone inputs does not exceed 96.

Connect units in daisy-chain fashion (as shown below) using the 18” straight-through patch cable included with each unit (Part # 830-150-004) . For larger distances between units, use CAT 5 twisted pair cable with RJ-45 connectors. The maximum cable length between connected units is 200 feet (61 meters).

Converge Pro 840T Converge Pro 880 Link In

VOLTAGE RANGE 100-240 VAC 2A															LINK IN				VOLTAGE RANGE 100-240 VAC 2A		MIC / LINE				LINE OUT									LINK IN
FREQUENCY 50Hz / 60Hz								+	-								PC		FREQUENCY 50Hz / 60Hz	1	2	3	4	1	2	3	4								PC
																	TELCO										+	-
															RS-232	A	LINE	SET																RS-232	A
	MIC / LINE					LINE OUT				LINE IN			LINE OUT			B													LINE IN			LINE OUT			B
1	2	3	4	1	2	3	4	5	6	7	8	5	6	7	8												9	10	11	12	9	10	11	12
																	LAN																		LAN
															LINK OUT					5	6	7	8	5	6	7	8							LINK OUT

Link Out Link Out

Converge Pro 8i Link In Converge Pro TH20

Link In

VOLTAGE RANGE 100-240 VAC 2A

MIC / LINE

LINK IN

VOLTAGE RANGE 100-240 VAC 2A

LINK IN

FREQUENCY 50Hz / 60Hz

FREQUENCY 50Hz / 60Hz

1

2

3

4

+

-

PC

PC

TELCO

RS-232

A

RS-232

A

LINE

SET

LINE IN

CONTROL / STATUS

LINE IN

CONTROL / STATUS

B

LINE OUT

B

9

10

11

12

1

2

1

2

LAN

LAN

5

6

7

8

LINK OUT

LINK OUT

Link Out

Audio and Control Buses

The E-bus allows audio routing between source devices and destination devices on the E-bus network. The E-bus contains 18 independent digital audio buses labeled I–Z, which can route mic or line inputs in any combination across the E-bus network. The E-bus also contains eight PA adapt/acoustic echo cancellation reference buses, six global gating buses, and one control bus.

S-Z Buses: These eight buses are line input mixer buses. They are used to route auxiliary audio, such as from a CD player or VCR, to and from other units on the network. These buses are also used as mic mixer buses when NOM count is not required.

I-R Buses: These ten audio buses are generally used for routing microphone audio between Converge/Converge Pro devices. Information about the number of gated microphones (NOMcount) and other relevant information for the microphone mixers are tracked for microphones routed to these buses. By default, all microphones are routed to the O bus.

PA Adapt/Acoustic Echo Cancellation Reference Buses: These buses allow an input from a Converge/ Converge Pro device to reference an output on another linked device for AEC and PA Adaption. See AEC Reference/ PA Adapt Reference and AEC for more information.

Global Gating Groups A-F:These buses are microphone gating groups that support first-mic priority, maximum number of mics, etc. and work across all linked Converge/Converge Pro devices. Unlike the audio buses, they contain only mic status and gate parameters. See the Gating and Gating Group topics for more information.

Control Bus: The control bus is an independent channel from the E-bus’s audio channel. This allows control information to pass even if the units are not using the audio link. All models support the use of the Converge/ Converge Pro serial command set through the control bus.

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