Chapter 3. Installation
65
Table 3-4. Common Synchronization Frequencies
Reference Clock Frequency (in
Hz)
Reference Clock Frequency
Tolerance (+/- Hz)
8,000 0.26
9,600 0.31
56,000 1.81
64,000 2.07
128,000 4.15
256,000 8.29
768,000 24.87
1,536,000 49.74
Slot 2 Synchronization (Optional)
The Slot 2 Synchronization feature allows data line cards to provide local timing for the D/I Mux III. A
data line card plugged into card slot 2 is the external input used to produce a 1.544 MHz clock reference.
The external input is 8 kHz or greater and is a multiple of 1600 Hz up to 1.544 MHz. To use this option,
install a data card in slot 2, and set up the D/I Mux III for Slot 2 Sync timing using the following software
commands. (For further detail on software configuration, refer to Chapter 4. Configuration and
Operation).
• SC - Use the SC command to set the mode of operation to Channel Bank or Dual Channel
Bank and the shelf timing to local.
• SS - Use the SS command to set the non-alarm clock source to External Slot 2 line card.
• SL - Use the SL command to set the line card data rate to which the D/I Mux III will be
synchronized.
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