ADTRAN TSU 120, Руководство пользователя

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Chapter 1. Introduction
61200.129L1-1 TSU 120 User Manual
15
Normal (CSU) Timing
The typical timing option arrangement is shown in
Figure 1-8. The PBX is looped timed sending data to
the TSU 120 which is actually synchronous to the
received data. The Network Interface (NI) is the
actual source of all timings. This timing option is the
same as that typically used for CSUs. This is the
preferred mode for use with a PBX application.
This timing mode works equally well when the PBX is
the source of timing. In that configuration the net-
work would not be providing timing.
DTE
OSC
Secondary
Interface
(SI)
( O P T I O N )
Network
Interface
(NI)
T1 XMIT
T1 Receive
( D S 1 )
Nx56/64
DTE CLOCK
DSX
PBX
(IO PB)
PBX
Figure 1-8
Normal (CSU)
The network interface and secondary interface clocking
options are set by using the Network (NI) Configuration
menu options.