ADTRAN 1202076L2 - Manual (Page 64)

Chapter 5. Configuration Menu
5-4 TSU 600 User Manual 61202076L1-1
TSU 600 Clock Sources
The TSU 600 is operable from various clock sources, permitting it to per-
form properly in many different applications. The network interface
timing mode is set by using the Network (NI) Configuration menu op-
tions. The following options are available:
• Network Timing
• DTE Timing
• UBR1TE
• Internal Timing
• Secondary Timing
• Normal (CSU) Timing
The selected clock option always designates the clock source for trans-
mission. Clocking necessary for receiving data is always recovered from
incoming data.
Network Timing
The network is the source of timing. The received data clocking is
looped back to the network, where it is used to determine the transmis-
sion timing. This option is also referred to as loop timed as the transmis-
sion clock is derived from the received clock. See Figure 5-2.
Figure 5-2. Network Timed Clock Source
1 2 3
OPTION SLOTS
NETWORK
INTERFACE
4 5 6
TIMING SOURCE
SECONDARY
INTERFACE