Peripheral Cards; Line Cards - Mitel SX-2000 Light General Information Manual

Transfer Relays
Each circuit in the SFT uses a four form C relay to transfer between normal and SFT modes
of operation.
Loop Detector
When a transfer relay enters SFT mode, the loop detector connects in series with the loop
between the extension and CO trunk facility. This circuit prevents the extension from returning
to normal operating mode before an SFT mode call is completed. When the SFT mode call is
completed, the extension is returned to normal operating mode.
SFT Control Leads
The transfer control sensor on the SFT senses a loop closure across the SFT and SFT return
(SFTR) leads. When a loop closure is sensed, the power to the relays is removed, the relays
are released, and all circuits enter the transferred state.
Power Consumption
The total current drain for the SFT is typically 80 mA.
Power Dissipation (watts)
Power Supply
-48Vbat
@Vbat=-56 V

Peripheral Cards

Peripheral Interface cards join telephone trunks and peripheral devices (such as SUPERSET
telephones) to the system. Peripheral interface cards include line cards, page 25, and trunk
cards, page 26.

Line Cards

Line cards connect to single line sets, SUPERSETs, attendant consoles, and DATASETs. They
include
• Control Over Voice (COV) Line Card, page 26
• Digital Network Interface (DNI) Line Card, page 26
• On-Premise (ONS) Line Card, page 26
• Off-Premise (OPS) Line Card, page 26.
TYP. (Watts)
3.18
3.71
Configuration
TYP+20%
3.81
4.45
25