5.0 dB for single-mode with 9/125 micrometer cable 1300 nm. 8.0 dB for multi-mode with 62.5/125 micrometer cable 850 nm. Attenuation of cabling between two nodes (fiber-optic circuits are point-to-point) must not exceed the following maximum attenuations: 4.2 dB for multi-mode with 50/125 micrometer cable 850 nm. Single-mode fiber-optic cable: 9/125 micrometers. Multi-mode fiber-optic cable: 50/125 or 62.5125 micrometers.
Digital audio ports, single- and multi-mode fiber-optic RXA, TXA, RXB, and TXB (J100, J101, J102, and J103): ST® style, supervised. Consult wiring documentation provided in document P/N 52916ADD:C Addendum to DVC and DAA Manuals. Digital audio ports, wire media, A and B (TB2, TB3): Maximum distance per segment is 1900 feet (579.12 m) on Belden 5320UJ (18 AWG, TP) FPL cable: 18 AWG (0.821 mm2) twisted-pair, foil-shielded, power-limited. Recommended wiring: 14 to 18 AWG (2.08 to 0.821 mm2) twisted-pair. 24 VDC power (TB1): 24 VDC, 1.0 A, non-resettable, power-limited by the source. Refer to the DVC System Audio Product Application Guide (part number M-AG-DVC) for more details on DVC applications). NOTE: For NFS2-640/DVC applications using DAL devices, an NCA-2 is required to annunciate DAL device events. For firefighters telephone applications with a CA-1, the CFFT-1 can be mounted in the row below the CA-1. The CA-1 supports a DVC and an optional microphone in a single row. #FIRELITE VOICE EVAC SERIES#
The ADDR audio door series can be used when a CA-2 is mounted in the top two rows. The CA-2 supports a DVC, paging microphone, optional FFT telephone, and mounting location for an NCA-2 or NFS2-3030D CPU. The DVC provides flexible configurations based on one-row or two-row chassis options that mount into size “B”, “C”, or “D” CAB-4 Series cabinets.
Isolated alarm bus input, to be used for backup activation of alarm messages when normal digital communication is lost. – NFS2-640 with NCA-2 (NUP to NUP to NUP) digital and analog. – NFS2-640 (NUP to NUP) analog audio only. – NFS2-3030 (NUP to NUP) digital and analog. Three standalone, non-network mode options:. Distribution of one channel of standard-level paging audio on NOTI. Multiple audio command centers supported via NOTI. Associated NCA-2, or NFS2-3030 (programmed for network monitor mode) supports NOTI. Selectable AGC, user control of audio level, and audio supervision are supported. High impedance input accepts 600 ohm, line level, 1.0 VRMS, or 1.41 Vp-p low level audio. Auxiliary input accepts external audio sources such as telephone paging or background music. Includes user audio level adjustment feature. Auxiliary input for 12 Vp-p analog low-level audio sources. Broad All-Call functionality when used with DVC-KD (DVC Keyboard Display): All Call, Page Active Evac Areas, Page Active Alert Areas, Page Inactive Areas. Firefighters’ Telephone Communications to local FFT riser on DVC, 32 local DAL device FFT risers, and FFT communication to additional command stations via NOTI. DCC (Display and Control Center) capabilities when used with optional DVC-KD. Electrically isolated digital audio ports for direct connection with up to 32 Digital Audio Loop (DAL) devices. Equations support flexible programming for distribution of messages. – DVC-EMSF: Same as DVC-EM, except supports single-mode fiber-optic media. – DVC-EMF: Same as DVC-EM, except supports multimode fiber-optic media. – DVC-EM: up to 32 minutes of standard quality or 4 minutes of high quality digital audio storage of user-selected/created messages and tones. Programmable from NUP port using VeriFire® Tools with:. Listed to UL Standard 864, 9th edition. 
NOTE: Unless otherwise noted, the term “DVC” refers to the DVCEM, DVC-EMF, and DVC-EMSF models.
When used as an Audio Command Center with Emergency Paging capability, the optional DVC-KD Keypad Display is required. A DVC can be connected directly with a single NFS2-640 or NFS2-3030 Fire Alarm Control Panel (FACP) to create a standalone integrated audio solution as well.
NET with an NCA-2, or with an NFS2-3030 (running in network monitor mode). The DVC may be networked with ONYX® Series panels via NOTI Larger audio systems incorporating hundreds of amplifiers can be created by networking additional DVC units via NOTI DVCs are available in versions supporting wire, multi-mode fiber, or single-mode fiber media. Designed for use with Digital Audio Loop (DAL) devices such as DAA2, DAX and DAA series digital amplifiers, each DVC supports a dedicated audio network with up to eight channels of audio, five channels of firefighter telephone communications, and control and supervision for up to 32 DAL devices. The DVC Digital Voice Command combines the capabilities of a powerful digital audio processor, an event-driven audio message generator, and a router. The DVC is the heart of an integrated, full-featured Audio Command Center.
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