Ericsson MINI-LINK E - Ethernet Logic; ETU Block Diagram

MINI-LINKEandEMicro
3.11.2 Functional Blocks
The ETU consists of the following functional blocks:
• Ether net logic
• Traff ic converter and buffer
• G.703 logic
Ethernet
logic
Traffic
converter
and buffer
G.703
logic
10BASE-T/100BASE-TX
O&M
E1/E2/E3
ALARM
LEDs
3611
Figure 53 ETU block diagram
3.11.2.1 Ethernet Logic
The block includes an Ethernet interface circuit.
Incoming Ethernet frames are captured, the preambles are cut off and the
remaining frames are transferred to the next functional block.
Ether net frames for transmission are received and preambles are added before
being transmitted.
3.11.2.2 Traffic Conver ter and Buffer
The Ethernet frames from the Ethernet side are stored in a buffer until they
are transmitted. Before the frames are sent to the G.703 logic they are
encapsulated in HDLC frames.
The received HDLC frames are captured from the data received from the G.703
logic block, the HDLC overhead is cut off and the remaining E thernet frames
arestoredinabuffer.
The block also implements the O&M and LED functions.
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AE/LZT 110 2012 R8C 2002-03-04