General DataComm DeskTop T1, Инструкция по установке и эксплуатации

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Timing Options C-9
GDC 048R154-000
Figure C-4 DTE Split Timing
Typical Network Applications
Although you can use the DeskTop T1 DSU in various network
configurations with different types of equipment, the following simple
applications illustrate the fundamental reasoning you use to select the
appropriate timing option.
Back-to-Back Application
In an in-house data communications network, two DeskTop T1 DSUs
are connected back-to-back. The only component connecting them is
cable, so there is no network to provide the timing source.
If the customer equipment connected to the channel cannot provide
Receive
Buffer
Transmit
(Send)
Buffer
Clock
Translator
Network
Receive T1
Data
DTE Receive
Data
Network
Send T1 Data
DTE Send
Data
1
3
2
4
S1
DTE Receive
Clock
DTE External
Clock
Recovered
Receive
T1
Clock
DeskTop T1 DSU
Timing
Source
5
S2
Timing
Source