Interphase-tech RAS Communications Controller 5536 Manuale Utente Pagina 53

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Chapter 3: Connecting to the Line
5536 PRI RAS Communications Controller Users Guide 33
E1 Link Requirements
If the board connects to the E1 line, the board and NT1 must
be configured with several common parameters to
interoperate. The board’s E1 parameters are in accordance
with the IUT-T I 431 recommendation, as follows:
• Line coding: HDB3, according to IUT-T G.703
• Frame format: according to IUT-T G.704
CRC4 to Non-CRC4 operation: according to
IUT-T G.706 An.B
Line I/O impedance: 120 Ohm ± 5%
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