General DataComm DeskTop T1 Installation And Operation Instruction Manual page 80

C-6
Network Receive
T1 Data
Recovered
Receive
T1
Clock
4
3
Network
Send T1 Data
Figure C-2 Internal Timing
DTE Timing
With DTE Timing, illustrated in Figure C-3, the customer equipment
connected to the DSU DTEl interface provides its own channel
transmit clock signal (1) on the appropriate interface lead. The
DeskTop T1 DSU translates (2) this clock to provide the send timing
source for T1 data output from the transmit buffer (3) to the network.
The remote DSU uses this as its timing reference (4) and loops it back
to the DeskTop T1 DSU (5). The DeskTop T1 DSU recovers the
receive T1 clock from the network receive T1 data and uses it to clock
T1 data into the receive buffer (6). The DeskTop T1 DSU also
translates (7) the receive T1 clock to provide the receive clock signals
for the channel on the appropriate interface leads.
GDC 048R154-000
DeskTop T1 DSU
Receive
Buffer
5
Clock
Translator
6
1
Timing
S1
Source
2
Transmit
(Send)
Buffer
Timing Options
DTE Receive
Data
DTE Receive
Clock
DTE Send
Data
DTE External
Clock