Comtech EF Data SDM-9220 - Manual (Page 39)

Unpacking
Memotec Inc. 3-3
3.1.3 Distance Requirements
• The SDM-9220/9230 unit should be no more than 2 meters (approx. 6 feet) away
from an easily accessible power supply appropriate to the type of power supply
on the unit:
- SDM-9220 UAC or SDM-9230 UAC: 100-240 VAC, (50/60 Hz)
- SDM-9220 DC or SDM-9230 DC: -48 VDC, (2 Amps maximum)
WARNING:
:
In countries where a 2-pin non-grounded power cord
must be used for the SDM-9220 UAC or SDM-9230 UAC, ensure
that the unit is independently grounded with a wire from Ground
securely attached to the ground lug on the power supply at the rear
of the unit chassis.
For the location of the ground lug, refer to “Rear View of the SDM-
9230 UAC” on page 5-2 .
- The maximum length of user equipment connections is relative to the serial
(WAN/user) port speed:
- 6 Mbps: 8 meters (25 feet)
- 2 Mbps or less: 30 meters (100 feet)
• There should be no more than 8 meters (25 feet) between modems and WAN link
(PVCR) connections.
• Equipment that is directly connected to the voice interfaces can be placed much
farther away. Up to 2750 meters (9000 feet) of cable is permitted between each
NetPerformer analog interface and its attached equipment.
NOTE: Distance may be an important factor for an E&M interface on the SDM-9220
UAC and SDM-9230 UAC.
If the PBX and the NetPerformer UAC unit are not near each other (in the
same room, for example) then their AC grounds may not be the same. Refer to
“E&M Grounding Considerations” on page 4-25 for a workaround.