ADTRAN 1202011L1, Руководство пользователя

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Chapter 5. Network Configuration
5-6 DSU III AR User Manual 61202011L1-1
Clock Source
The C
LOCK
S
OURCE
options specify the timing source for the DSU
III AR internal circuitry. The choices are F
ROM
N
ETWORK
and
M
ASTER
. The factory default setting is F
ROM
N
ETWORK
(see Figure
5-5).
Figure 5-5. Setting the Clock Source
When operating on a DDS network, the timing should be from the
most stable clock source, usually
F
ROM
N
ETWORK
. On a point-to-
point private network, one DSU III AR must be set for M
ASTER
and
the other set for F
ROM
N
ETWORK
. Table 5-5 shows the equivalent AT
commands for setting the clock source.
When the DSU III AR is set as the master clock source, it will
default to its internal oscillator as the clock reference. To enable the
External DTE port as the reference clock for the circuit, see Chapter
6, Configuring DTE Options on page 6-1.
1= LOOP RATE
1= NETWORK OPT. 2= NETWORK ADDR
1= LOCAL 3= REMOTE CONFIG
4= NETWORK TYPE 1= MASTER
3=CONFIG 5= CLOCK SOURCE 2= FROM NETWORK
2= DTE OPTIONS
2= REMOTE ENTER 3= TEST OPTIONS
ADDRESS 4= DIAL OPTIONS
5= MANUAL COMMAND
Table 5-5. Setting the Clock Source
Front Panel AT Command Description
1=MASTER _X0 DSU is the master timing source
2=FROM NETWORK _X1 Network RX Signal is timing source