CTC Union ETU01C Dokumentacja Pobierz pdf (Strona 12)

Chapter 1. Introduction

12

The ETU01-Plus can select from one of five clocking mode settings.

Clock mode 0 (DCE 1):

The ETU01-Plus data channel operates as a DCE and provides both transmit and

receive clocks (recovered timing) to the data terminal equipment connected to the

user channel. The clocks are locked to the recovered E1 timing.

Figure 1.1 Recovery timing

Clock mode 1 (DCE 2):

The ETU01-Plus data channel operates as a DCE and provides both transmit and

receive clocks (internal oscillator timing) to the data terminal equipment connected to

the user channel. The clocks are locked to the oscillator timing.

Figure 1.2 Internal Timing

The internal oscillator provides the clocking source for both the user data receive

timing out the RC and TC pins and the E1 transmit timing.

DTE

Connected

Equipt.

DCE

Data

Port

E1

E1

transceiver

Clock Mode 0: Recovery

TC

RC

TX

RX

DTE

Connected

Equipt.

DCE

Data

Port

E1

E1

transceiver

Clock Mode 1: Internal

OSC

TC

RC

RX

TX

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