About SMB Controller
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Music on Hold (MoH)
Figure 13: Connection for FXS mode Analog Music on Hold
The no-load voltage at the ports is approx. 53 VDC. The loop current is limited to 25 mA.
Ports FXS1...FXS6 on the mainboard are designed for long lines and support "High voltage" for
the message LED. The no-load voltage at these ports is 48 VDC. The ports of interface cards
(ETAB4) have a no-load voltage of 53 VDC. The loop current is limited to 25 mA on all ports.
Table 12: Cable requirements for FXS mode: Phone/fax
Ports FXS1...FXS6 Ports of interface cards
(ETAB4)
Core pairs × cores 1 × 2 1 × 2
Stranded only with lengths > 200 m only with lengths > 200 m
Wire diameter, core 0.4 … 0.8 mm 0.4 … 0.8 mm
FXS resistance max. 2 × 625 Ω max. 2 × 250 Ω
Line length 0.6 mm diameter max. 10 km max. 4 km
Screening not required not required
Document Version 1.0
System Manual for Mitel SMB Controller 42
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