Data Sheet

ManualsBrandsBosch ManualsBurglar AlarmsFire Package Includes D7412GV4/D8109/D928

Fire Alarm Systems | D928 Dual Phone Line Switcher

D928 Dual Phone Line Switcher

www.boschsecurity.com

u Automatically switches to alternate phone line

u AC Power LED

u Primary and Secondary Phone Trouble LEDs

u Communication Fail LED

All reporting fire alarm systems are required to have a

primary and alternate means of transmitting reports to

a receiver. The D928 Dual Phone Line Switcher allows

the control panel to operate over and supervise two

separate phone lines. Typical applications are schools,

factories, and care facilities where the ability of the

system to relay information off‑premises is especially

critical for safeguarding life and property.

Functions

System Operation

If a signal is generated and the control panel senses

that the primary phone line is bad, then it uses the

alternate phone line to send the message. If trouble is

detected, the control panel keeps the faulty phone line

in memory.

If the primary line is found to be electrically faulty, the

D928 switches to the alternate phone line and reports

the fault. The D928 uses the primary or alternate

phone line to dial a primary, backup, or duplicate

phone number.

When using the Modem IIIa

communication format,

the control panel sends a phone line failure message

to the D6100i or D6600 Receiver, indicating which

phone line is in trouble. The control panel sends two

distinct messages for trouble on the primary or

alternate phone line.

Four LEDs mounted on the front edge of the D928

serve as status LEDs by displaying primary and

alternate phone line failure, failure to communicate,

and AC power status.

Certifications and approvals

Region Certification

USA UL AMCX7: Central Station Alarm Units Cer-

tified for Canada, AOTX7: Local Alarm

Units Certified for Canada, APAW7: Po-

lice Station Alarm Units Certified for

Canada, APOU7: Proprietary Alarm Units

Certified for Canada, NBSX7: Household

Burglar Alarm System Units Certified for

Canada, and UOJZ: Control Units, Sys-

tem

FM D928

CSFM see our website

FCC ESVAL03BD928

FDNY-

CoA

Fire Department of NYC

Summary of content (3 pages)

PAGE 1
Fire Alarm Systems | D928 Dual Phone Line Switcher D928 Dual Phone Line Switcher www.boschsecurity.com All reporting fire alarm systems are required to have a primary and alternate means of transmitting reports to a receiver. The D928 Dual Phone Line Switcher allows the control panel to operate over and supervise two separate phone lines.
PAGE 2
| D928 Dual Phone Line Switcher Region Canada Certification Technical specifications NYCMEA 12-92-E, Vol. 12 12-92-E, Vol. 12 Mechanical Properties NYCMEA 12-92-E, Vol. XV IC 1249A-D928 Dimensions (HxWxD): 5 in. x 3 in. x 3.8 in. (13 cm x 8 cm x 2 cm) Weight: 3.3 oz. (93.5 g) Installation/configuration notes Power Requirements Compatibility Information The D928 Dual Phone Line Switcher is compatible with these Bosch Security Systems, Inc.
PAGE 3
| D928 Dual Phone Line Switcher Represented by: North America: Bosch Security Systems, Inc. 130 Perinton Parkway Fairport, New York, 14450, USA Phone: +1 800 289 0096 Fax: +1 585 223 9180 security.sales@us.bosch.com www.boschsecurity.us Europe, Middle East, Africa: Bosch Security Systems B.V. P.O. Box 80002 5617 BA Eindhoven, The Netherlands Phone: + 31 40 2577 284 Fax: +31 40 2577 330 emea.securitysystems@bosch.com www.boschsecurity.