SigTEL Compact - Network Connections (Optional); Speech and Digital Network Wiring

SigTEL Compact Installation and Configuration Manual
SigTEL Approved Document No. DAU0000091 Rev 5 Page 16 of 36
Emergency Voice
Communication System
9 Network Connections (Optional)
The EVCS network allows up to 14 MCUs and LCUs to be connected by installing a Network Communications
Card (ECU722) in each unit.
The ECU722 card transmits speech audio via a single wiring loop and digital data via two linear RS485 networks
(Digital Networks 1 & 2). The network should be connected using 4 x 2-core, 1.5 mm
2
enhanced fire-rated cable.
Maximum length on the speech wiring loop, or digital linear wiring = 1 km. We recommend that two separate cable
paths be run with each path containing a single speech and single data cable which should not be mixed in the
same cable. MIXING SPEECH AND DIGITAL CABLES MAY CAUSE MAJOR PROBLEMS AND DEGRADE THE AUDIO SIGNAL!
A typical EVCS network showing three connected MCU/LCU units is shown below.
Speech loop wiring: ECU722 No.1 (Speech OUT/0V) to ECU722 No.3 (Speech IN/0V); ECU722 No.3 (Speech
OUT/0V) to ECU722 No.2 (Speech IN/0V); ECU722 No.2 (Speech OUT/0V) to ECU722 No.1 (Speech IN/0V).
Digital Network 1 wiring: ECU722 No.1 (Digital A/B/C) to ECU722 No.2 (Digital A/B/C); ECU722 No.2 (Digital
A/B/C) to ECU722 No.3 (Digital A/B/C).
Digital Network 2 wiring: Same wiring configuration as Digital Network 1.