Page 68 - 14th @ Irving Basis of Design (internal)

10.1.11 AUDIO SPECIFICATIONS
• Frequency Response: Within plus or minus 0.5dB, 20 Hz to 20,000 Hz.
• Maximum Latency from Communications – 11.9 ms

• Signal to Noise Ratio: Greater than 90dB (including crosstalk and hum at all input/output levels)
• Total Harmonic Distortion: 0.05% maximum from 20 Hz to 20,000 Hz.
Figure 1 – Audio Input Levels

Microphone (Nominal): -50dbu

Overload (Minimum gain): - 5dbu

Maximum Gain: -26dbu
Line (Nominal): +4dbu
Overload (Minimum gain): +24bu

Maximum Gain: +9dbu

Input Common Mode Rejection: >100d
Figure 2 – Audio Output Levels

Microphone (Nominal): -50dbu
Overload (Minimum gain): - 5dbu

Maximum Gain: -26dbu

Line (Nominal): +4dbu
Overload (Minimum gain): +24bu
Maximum Gain: +9dbu

Input Common Mode Rejection: >100d

10.1.12 MESSAGING SERVERS

The messaging system Digital Record and Playback (DRP) shall be integral to the controller or reside on the network as a message
server appliance.
• Eight (8) Channels of Recording and (8) Channels of Playback shall be simultaneously available in each message
server. Each VLAN segment can support up to four message servers. Each channel shall provide a minimum of 130
seconds of recording. Times shall be configurable based on announcement type.

• When a communications station or workstation initiates an announcement, the system shall dynamically assign a
communications channel (CobraNet), and assign it to an open DRP channel. The announcement shall be played if the
mic switch is released prior to the end of the record time. If the mic switch is pressed and held during a 5 second (or
as programmed) silence period, the announcement shall be cancelled. The announcement will playback
automatically, to the selected zone group, in its assigned queue position. Messages shall be stored in non-volatile
memory and have a minimum capacity of 20,000 minutes.

• The system shall support minimum of 8 languages.

14th @ IRVING WSP
Project No. B1809809.000
RAL COMPANIES & AFFILIATES Page 68