General DataComm DeskTop T1 Installation And Operation Instruction Manual page 84

C-10
timing, select Internal Timing for the master or host end, and select
Receive Timing for the other, as shown in Figure C-5 A. In this
example, the DeskTop T1 DSU at Site A is configured for Internal
Timing, making it the timing source.
If the customer equipment is to provide an external timing source,
select Channel Timing for the DeskTop T1 DSU connected to that
equipment and select Receive Timing for the other, as shown in Figure
C-5 B. In this example, the host computer at Site A is providing timing,
so its DeskTop T1 DSU is configured for Channel Timing.
In the master/slave multiplexer application illustrated in Figure C-5 C,
the multiplexer at Site A is configured as the master (i.e., the timing
source) and the multiplexer at Site B is configured as a slave. With
Channel Timing selected for both DeskTop T1 DSUs, the master
multiplexer provides timing and the slave multiplexer loops back
timing so timing is dependent on the customer equipment.
AAAAAAAAAAAAAAAAA A
A A
A A
Timing
Source
A A
A A
DeskTop T1
A A
Timing
A A
Option:
Internal
A A
A A
AAAAAAAAAAAAAAAAA Host Computer
A. DeskTop T1 DSU at Site A Supplies Timing
GDC 048R154-000
AA A AAAAAAAAAAAAAAAAAA
AA AA A A
Site A
Site B
AA AA A A
AA AA A A
AA AA A A
DeskTop T1
DSU DSU
AA AA A A
Timing
AA AA A A
Option:
Receive
AA AA A A
AA AA A A
AAAAAAAAAAAAAAAAAA
Timing Options
AA
AA AA
AA AA
AA AA
AA AA
AA AA
AA AA
Terminal
AA AA
AA AA