Alpha FlexNet MPS48-7C, Техническое руководство

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11 021-511-B3-004, Rev. D
2.0 Theory of Operation
The FlexNet MPS48-7C multipurpose power supply provides fi ltered 50W output power for a typical
48V telecom bus during normal line operation. During line disruptions, the MPS48-7C supplies
uninterrupted output power of 50W directly from a string of four 12V batteries.
Metal oxide varistor (MOV) technology provides line voltage surge suppression in the event of line
cross or power spikes. An electromagnetic fi lter conditions line voltage, enabling the power supply
to operate in compliance with FCC Class A standards. The AC-to-DC converter feeds power to the
primary winding of a high frequency isolation transformer. The resulting DC output, at the secondary
of the transformer, provides power to the load and charges the 48V string batteries, keeping them
fully charged in preparation for a line disruption. MPS48-7C battery temperature compensation range
is from -0ºC to +40ºC. A battery heater mat option extends battery life in cold environments. Maximum
output voltage is 56Vdc.
The power module provides over-current, over-voltage, and short-circuit protection. After the fault
is cleared, the power module automatically resumes power to the load. The control logic circuitry
provides a LVD (low battery voltage disconnect), detects the presence (or absence) of batteries,
performs periodic battery testing, and communicates status locally with LED status indicators.
Preconnectorized cables of varying lengths provide reliable and effi cient fi eld installation. Ethernet,
48Vdc power (with return) and RS232 interface are supported on the preconnectorized cables.
The MPS housing is constructed of weather resistant powder coated aluminum. The enclosure can be
pole or wall-mounted.
AC service is routed into the bottom of the enclosure through a 1/2" Electrical Metallic Tubing (EMT)
knockout located in the bottom center of the enclosure. The data and power cables are routed
through a provided 3-hole strain relief fi tting. Optional 1/2" and 3/4" knockouts are provided at the
back, bottom, and sides of the enclosure.
The interface module includes:
• An RJ11/RJ45 pair of connections supporting the Aironet 1500. The RJ11 includes the RS232
connection to the Aironet 1500. The RJ45 provides an Ethernet connection between the radio and
48Vdc power (and return).
• An RJ45 for connection to a remote router or modem (Ethernet backhaul).
• An RJ11 Craft Port connection providing an RS232 connection to the Aironet 1500 for network
management information.
• A terminal block providing 48Vdc power to an auxiliary piece of equipment, such as a camera.
Table 2-1, Network Connections
Radio, Power Ethernet Backhaul Radio, Serial Local Craft
RJ45 RJ45 RJ11 RJ11
Pin Pin Pin
1 Data Pair RX 1 Data Pair RX 1 NC 1 NC
2 Data Pair RX 2 Data Pair RX 2 Radio TX 2 Local RX
3 Data Pair TX 3 Data Pair TX 3 Return 3 Return
4 -Vdc 4 NC 4 Radio RX 4 Local TX
5 -Vdc 5 NC 5 NC 5 NC
6 Data Pair TX 6 Data Pair TX 6 NC 6 NC
7 +Vdc 7 NC
8 +Vdc 8 NC