Filter
Top Products
Evaluation Board for Octal E1 Applications — LXD381
Developer Manual 7
2.0 Evaluation Board Set-Up
Caution: CMOS devices are static (ESD) sensitive. Take all industry standard precautions when handling the
evaluation board, the LXT381 chip and other sensitive electronic components.
Before proceeding with any evaluation board operations, review the specifications for the LXT381
transceiver.
2.1 LXD381 Packing List
The evaluation board kit contains the following components:
• LXD381 board with LXT381 device installed.
• LXD381 User Guide.
• LXT381 Data Sheet.
2.2 Equipment Requirements
The evaluation board kit includes all the circuit components needed for a successful evaluation.
However, the following lab equipment is required:
• Power Supply (+3.3 VDC).
• Telecom cable or cable simulator (optional).
• E1 pattern generator/analyzer
2.3 Power Connections
The evaluation board has two power planes (VCC and TVCC) each of which is tied to a separate
red colored banana jack. Connect the +3.3 VDC power supply to both the VCC (B1) and TVCC
(B3) banana jacks. Connect the power supply ground lead to the black banana jack (B2).
2.4 Loopback Mode Selection
The LXT381 LOOP signals for channels 0 through 7 are set by the switches in switch block S1. As
shown in Table 1, these switches have three positions to select Remote Loopback, Analog
Loopback or No Loopback.
Table 1. LOOP0 - 7 Switch Settings
S1 Switch Position Operation
High Analog Loopback
Center No Loopback
Low Remote Loopback