Chapter 1: Introduction
8
E1 link timing
The
MUX128/2*64
G.703/64K link receive path always
operates on the receive clock. The
MUX128/2*64
recovers
the receive clock from the received link data signal. The
source of the
MUX128/2*64
link transmit clock may be
selected by the user. The following four transmit timing
modes are available.
•
Recovery timing
:
The
MUX128/2*64
G.703 link transmit clock is locked to
the recovered receive clock. This is usually the timing mode
selected for network operation.
•
Internal timing
:
The
MUX128/2*64
G.703 link transmit clock is derived
from the internal clock oscillator. This timing mode is
necessary in point-to-point applications over leased lines. In
this case, one
MUX128/2*64
must use the internal oscillator,
and the other must operate from the recovered clock.
•
Transparent timing
:
The
MUX128/2*64
synchronous data channel accepts the
recovered G.703 clock and provides the G.703 transmit clock
from the DCE (Transparent timing).
•
External timing
:
The
ETU-01A
E1 link transmit clock is locked to the
clock signal provided by the user DCE connected to the data
channel.
Summary of Contents for MUX128
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