User manual

Chapter 5. Configuration Menu
61202156L1-1 TDU 120e User Manual 5-5
Based DS-1
The PBX is the source of timing. The TDU 120e uses the clock
derived by the Base DS-1 interface for transmission timing.
See Figure 5-3.
Figure 5-3. DS-1 Timed Clock Source
Base DTE Timing
The Base DTE is the source of timing. The TDU 120e uses the
incoming DTE clock to determine the transmission timing.
This is typically used in applications where it is necessary to
have the DTE as the primary clock source (such as limited
distance line drivers). See Figure 5-4.
Figure 5-4. Base DTE Timing Clock Source
DTE
OSC
(OPTION)
Network
Interface
T1 XMIT
T1 Receive
(DS1)
Nx56/64
DTE CLOCK
DS-1
PBX
DTE
OSC
(OPTION)
Network
Interface
T1 XMIT
T1 Receive
(DS1)
Nx56/64
DTE CLOCK
DS-1
PBX