Tsu 120 Clock Sources; Network Timed; Figure 1-4. Network Timed Clock Source - ADTRAN TSU 120 User Manual

TSU 120 CLOCK SOURCES

Network Timed

T1 XMIT
( D S 1 )
T1 Receive
61200.129L1-1
The TSU 120 is operable from various clock sources,
permitting it to perform properly in many different
applications. The network interface clocking options
are set by using the clocking options set by using the
Network (NI) Configuration menu options. The
following clock source options are available:
• Network
• Base DSX-1
• DTE Timed
• Internal Timing
• Secondary Timed
• Normal (CSU)
The clock option selected always designates the clock source
for transmission. Clocking necessary for receiving data is
always recovered from incoming data.
The network is the source of timing. The received data
clocking is looped back to the network where it is used
to determine the transmission timing. This option is
also referred to as looped timed as the transmission clock
is derived from the received clock. See Figure 1-4.
OSC
Network
Interface
Nx56/64
DTE CLOCK
DTE
TSU 120 User Manual
Chapter 1. Introduction
Secondary
Interface
( O P T I O N )
DSX-1 PBX
PBX
Network Timed Clock Source
Figure 1-4
1 1