Chapter 1. Introduction
8
November 2001
• External (DTE) timing:
The ETU-01A has three data channel clocking modes:
• Clock mode DTE1: The ETU-01A data channel accepts the
user transmit clock from the connected DTE (from the ETC
pin) and provides a receive clock (Transparent timing) to the
synchronous equipment connected to the data channel.
• Clock mode DTE2: The ETU-01A data channel accepts the
user transmit clock (from ETC pin) and receive clock (from
ERC pin) provided by the DTE equipment connected to the
data channel. Note: The X.21 data channel cannot be
operated in this mode.
• Clock mode DTE3: The ETU-01A data channel operates as
a DCE and accepts both the user transmit and receive clock
(All from ETC pin) provided by the DTE equipment
connected to the data channel.
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