SIEMENS DFM-BRK Fiber Optic Interface and Bracket Instruction Manual

: June 9, 2024
: SIEMENS

Table of Contents

INTRODUCTION
INSTALLATION
ELECTRICAL RATINGS
FIBER RATINGS
Support
References
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SIEMENS DFM-BRK Fiber Optic Interface and Bracket Instruction Manual

INTRODUCTION

The Model DFM-BRK from Siemens Industry, Inc., provides a fiber optic interface for the FireFinder XLS digital audio network (DNET) which interconnects the DAC-NET modules. The DFM-BRK can be connected either Style 4 or Style 7 and utilizes the Telebyte model DFM fiber optic converter. The DFM uses 62.5/125 um fiber at distances up to 2KM. Standard ST connectors are provided for connection of the optical fiber.

The DFM-BRK mounts in the rear of the XLS CAB-1/-2/-3 enclosure and occupies one module space

Figure 1 DFM-BRK Fiber Optic Interface Bracket For DNET

INSTALLATION

Warning

Remove all system power before installation, first battery then AC. (To power up, connect the AC first, then the battery.)

Each DFM-BRK requires at least one DFM converter. Required DFM may be ordered under P/N 500-634910. Check the wiring section below and determine the quantity and location of the DFMs for each DFM-BRK in the system

Attach one of the DB-25 cables, P/N 555-134899, supplied with the DFM-BRK to each DFM. Secure the DB-25 connector using the screws which are captive on the DFM.
Place the DFMs on the DFM-BRK with the ST connectors facing the bottom of the DFM-BRK. Be sure to observe the locations of the DFMs for the first and last DAC-NETs in a Style 4 network (see Figure 2). These two locations use only one DFM and their location on the DFM-BRK is critical to proper DNET operation.
Place the DFM hold-down bracket over the DFMs (see Figure 1) and secure in place using the two screws and nuts provided in the DFM-BRK hardware kit.
Plug the 6 position connector on the end of the DB-25 cable into the corresponding receptacle on the DFM-BRK.
Mount the DFM-BRK in the back of the enclosure with the four screws from the hardware kit.
Wire between the DFM-BRK TB1 and the DAC-NET (see Figure 2).
Figure 2 DNET Over Fiber Style 7 / Style 4

OMIT FOR STYLE 4
Connect 24V from TB4 on the PSC-12 to TB2 on the DFM-BRK, be sure to observe the correct polarity (see Figure 3).
Figure 3 DFM-BRK Input Power Wiring
Connect the fiber optic cables to the DFMs. The transmit (T) output on each DFM must go to the receive (R) input on its partner DFM for proper operation.
Apply power. If the Power LED on the DFM-BRK is not lit, check the polarity of the 24V input on TB2.
Once all DFM-BRKs are installed, check the DNET for errors. Refer to the DNET fault LEDs on the DAC-NETs. Once all DNET fault LEDs are clear the DNET is properly connected.

ELECTRICAL RATINGS

24V Back Plane Current	0
Screw Terminal 24V Current	135mA Per DFM
6.2V Back Plane Current	0
24V Standby Current	135mA Per DFM

FIBER RATINGS

Fiber Optic Cable	62.5/125-urn
Distance	2km Max.
Power Budget	12dB
Wavelength	850nm
Connectors	ST

NOTES

All wire and fiber connections supervised.
All wire connections power limited.
Maximum fiber length 2km.
Refer to DAC-NET Installation Instructions, P/N 315-035100
For Style 4 (DCLB) two DFMs are required on all DFM-BRKs located in the middle of the network. Only one DFM is required at each end.
For Style 7 (DCLC) two DFMs are required on every DFM-BRK regardless of the location.
In Canada, ULC S524 requires that all interconnecting data communications links for networks be wired DCLC (style 7) except for dedicated network communication to annunciators.

Cyber security disclaimer

Siemens products and solutions provide security functions to ensure the secure operation of building comfort, fire safety, security management and physical security systems. The security functions on these products and solutions are important components of a comprehensive security concept.

It is, however, necessary to implement and maintain a comprehensive, state-of- the-art security concept that is customized to individual security needs. Such a security concept may result in additional site-specific preventive action to ensure that the building comfort, fire safety, security management or physical security system for your site are operated in a secure manner. These measures may include, but are not limited to, separating networks,physically protecting system components, user awareness programs, defense in depth,etc.

For additional information on building technology security and our offerings, contact your Siemens sales or project department. We strongly recommend customers to follow our security advisories, which provide information on the latest security threats, patches and other mitigation measures.

http://www.siemens.com/cert/en/cert-security- advisories.htm