Read Panasonic BB-HCM701CE Service Manual online
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BB-HCM701CE
4.5.
LAN Block
Composed of ETHERNET MAC Block inside the IC101 and the IC301 (ETHER-PHY) on the CPU board, and the T601 (Trans-
former) and the JK601 (RJ45 jack) on the POWER Board.
The T605 (Transformer) obtains isolation between the Set and the Ethernet.
ETHERNET MAC and the IC301 (ETHER-PHY) are connected by a signal called MIIBus and it makes Ether net data sending
and receiving possible.
Sending
The communication data sent from the IC101 is converted to Ethernet signal (100Base-Tx, 10Base-T) at the IC301 and sent
from the JK 601 through the T601.
former) and the JK601 (RJ45 jack) on the POWER Board.
The T605 (Transformer) obtains isolation between the Set and the Ethernet.
ETHERNET MAC and the IC301 (ETHER-PHY) are connected by a signal called MIIBus and it makes Ether net data sending
and receiving possible.
Sending
The communication data sent from the IC101 is converted to Ethernet signal (100Base-Tx, 10Base-T) at the IC301 and sent
from the JK 601 through the T601.
Receiving
The Ethernet signal received from the JK601 is converted to the communication data at the IC301 and received to the IC101.
The Ethernet signal received from the JK601 is converted to the communication data at the IC301 and received to the IC101.
4.6.
Power Supply Block
• +3.3V is brought about by the power supply of +12V from the PoE (Power over Ethernet) circuit on the POWER board via the
DC-DC converter circuit composed of IC302, Q305, D311, L302 and C327.
• +1.8 V for power supply of IC103 and IC104 is generated by the series regulator (IC106).
• +1.2V for an internal circuit of IC101 is generated by the series regulator (IC107).
• +1.2V for an internal circuit of IC101 is generated by the series regulator (IC107).
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