Architect's & Engineer's Specifications

The audio network interface shall provide four card slots, each accepting one of the following cards: MM-Mic4 (4-channel microphone input), MM-Line4 (4-channel line input), or MM-Out4 (4-channel line output), providing up to 16 channels of analog audio transmitted via an Ethernet network, in any configuration of card combinations. It shall provide full-bandwidth, high-quality audio transmission via Ethernet without lossy compression techniques, drop-outs or signal degradation by employing either CobraNet or Dante audio transmission protocols. The specific audio performance characteristics are dependant upon the I/O cards loaded into the unit. Control features shall include four relays with both normally open and normally closed contacts, and eight channels of configurable GPIO pins. The GPIO pins may be configured as Digital Input (3.0V TTL logic - Low:0VDC-0.8VDC; High:2.0VDC-24VDC), Digital Output (3.0V TTL logic - Low:0VDC-0.4VDC; High:2.4VDC-3.3VDC), Analog Input (0-24VDC), or as part of a Rotary Encoder circuit (Requires 2 GPIO pins and a common +24VDC source). All GPIO functions are software controllable via an Ethernet link. All GPIO functions can control (or be controlled by) software parameters via an Ethernet link. Front-panel indicators shall display the following status conditions: signal transmission, signal reception, transmission error, reception error, fault indication, link indication, conductor status, and power presence. It shall have sixteen peak reading headroom meters to monitor the analog level present at the I/O cards with the top-most red LED indicating A/D (or D/A) clipping. Rear panel features shall include a detachable AC power cord, an AC power switch, and an AC power receptacle with a built-in auto-resetting circuit breaker. External or internal fuses shall not be acceptable. It shall have two word-clock connectors that, when used with CobraNet, enable auto-switchover to a redundant unit. It shall employ detachable, euro-style, bare-wire capturing, screw-terminal connectors for ease of hook-up and troubleshooting. These connectors shall be used for all line-level, microphone-level, and EIA-485 connections. It shall employ a DB-25 connector for control voltage, TTL, relay, and fault relay connections. The unit shall use a standard eight-conductor RJ-45 I/O jack for Ethernet connection. Its dimensions shall be 19 inches (483 mm) wide, 16 3/8 inches (416 mm) deep, and 3 1/2 inches (88 mm) high without feet. Its net weight shall be 9.5 pounds (4.3 kg.), and its 2 rack-unit (3 ½"), fan-cooled, steel chassis, shall be finished in black powder coat and silver trim bezel to match the styling cues of the MediaMatrix NION series Digital Signal Processors. It shall consume no more than 32 Watts of power and draw no more than 0.45 amps of current while dissipating no more than 108 BTUs of heat. It shall be supplied with a detachable AC cable. It shall be UL, CUL, and CE listed and comply with FCC part 15, A. The audio network interface shall be the MediaMatrix CAB 4n or approved equivalent.