Hardware Technical Reference Manual
The Universal Analog Services Unit rear panel provides:
• Female 25-pair Amphenol trunk/line connector (LS and ONS Tip/Ring or A/B circuits)
• One paging connector (supports two paging ports)
• One music on hold (MOH) connector
• Protective ground for grounding the chassis
• Input power connector (standard male IEC320 AC).
Music On Hold (Universal ASU only)
The MOH interface provides four physical ports for Music on Hold. However, only one port (of
ports 1 or 2) is supported through system software.
Each MOH port provides:
• 600 ohm input impedance
• Signal level overload protection as mandated by FCC part 68 on encoded analog content
• Dry Tip/Ring interface (no battery)
• Always active input (no external control required or provided).
The connection requires a cable with a 3.5 mm mono jack on one end and an 8-pin modular
jack (RJ-45) on the other end. The RJ-45 plugs into the Music On Hold port on the rear panel
of the Universal ASU; the 3.5 mm mono jack plugs into the output connector on the music
source (for example, radio). If you use a stereo jack, short the left and right channels of the jack.
Figure 31: Universal Analog Services Unit Rear Panel
Table 49: Music on Hold Connector Pin Allocation
Pin Number Signal Pin Number Signal
1 Tip 1 5 Ring 3
2 Ring 1 6 Ring 2
3Tip 27Tip 4
4 Tip 3 8 Ring 4
Note: Music on Hold can be assigned to either of the first two ports on a Universal ASU E&M card or
to the E&M port on the Analog Main Board (AMB) (on a controller with embedded analog). Only one
Music on Hold source is permitted per system.
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