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Normal (CSU) Timing
In the Normal (CSU) Timing mode, the Receive Clock is
derived from the Network Interface while the Transmit Clock is
derived from the PBX or other alternative timing source, con-
nected to the Secondary Interface (e.g., Drop and Insert or
DSX-1). See Figure 5-7.
This timing option is the same as that typically used for CSUs.
This is the preferred mode for use with a PBX application.
U-BR1TE
The U-BR1TE timing selection works like Normal (CSU) except
that timing is derived from the U interface on port 1.1.
61202129L1-1
Network
Interface
(NI)
Figure 5-7. Normal (CSU)
The network interface and secondary interface clocking options
are set by using the Network (NI) Configuration menu options.
Either a DSX-1 Option Module or a Drop and Insert Option
Module must be installed in the TSU 120 for this mode to func-
tion.
TSU 120 User Manual
Chapter 5. Configuration Menu
Secondary
Interface
(SI)
(OPTION)
5-11
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