Hardware Installation Manual 64 Document #: LTRT-94720
Mediant 3000
5.4 Connecting to BITS Trunk for Clock Synchronization
When the device is configured for the Building Integrated Timing Source (BITS)
synchronization mode, you need to follow the procedure described in this section for
appropriate cabling.
Note: For a detailed explanation on configuring the BITS clock synchronization, see the
User's Manual.
In HA mode, both active and redundant TP-6310 or TP-8410 blades are synchronized by
two BITS source interfaces (i.e., input trunks). The BITS trunks flow through the two
SA/M3K blades in the front panel (see Section 3.5 on page 33), each with a designated
timing module, which is located on the PEM modules. Two SA/M3K blades are required to
ensure seamless clock operation in case of failure in one of the SA/M3K blade's timing-
modules (i.e., clock redundancy). When one of the BITS reference clock sources fails, the
device automatically switches to the secondary source as a reference clock for the whole
system.
In Simplex mode, if the primary BITS clock source fails (and clock fallback is enabled), the
device uses the secondary BITS clock source. However, during the transition between the
failed clock and the secondary clock, the device remains in hold-over mode until the
secondary clock is acquired.
The RJ-48c connector pinouts are shown in the figure below:
Figure 5-13: RJ-48c Connector Pinouts for E1/T1
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