Specifications

MX-2100/2104 Installation and Operation Manual Chapter 1 General Information
Application Considerations 1-43
I/O Modules
MX-2100 MX-2100
Loopback Timing Loopback Timing
I/O Modules
Digital
Data
Network
Master
Clock
Figure 1-31. Typical Loopback Timing Application
DCE Timing (KML.7, KML.8, and KML.F Modules)
When the DCE timing mode is used with a KML.7, KML.8, or KML.F module, the
timing signals of both the MX-2100 unit’s main link receive and transmit paths is
taken from one of the I/O module channels. Alternatively, in dual link chassis
configurations, the timing can be taken from the other main link module.
DCE Timing from I/O Channel
Similarly to the Internal mode, the DCE timing mode can be used in point-to-point
links and in independent networks. In any link or network, only one MX-2100 unit
may operate with DCE timing. All the other units must use loopback timing to
ensure synchronization. In this way, the unit that operates with DCE timing is the
source of the master clock and determines timing of the entire network.
Figure 1-32 shows a basic network configuration that uses a KML.7, KML.8 or
KML.F module in the DCE timing mode at the local MX-2100, with the timing
taken from one of its KHS.1 channels. In conjunction, the remote MX-2100
operates in the loopback timing mode.
MX-2100 MX-2100
DCE Timing Loopback Timing
I/O Modules
KHS.1
XMIT
Clock
RCV
Clock
Channel
in DTE2
Timing
DDS
Network
Master
Clock
DTE
Figure 1-32. Typical DCE from I/O Timing Mode Application (KML.7, KML.8, KML.F)
DCE Timing from Main Link
In dual link configurations, the DCE timing mode can be used by the KML.7,
KML.8 or KML.F main link module in order to use the other installed main link as
the timing source. The source main link can be of any type (for example KML.1),
and be operating in any of the timing modes relevant for the type, as were
previously described.
Figure 1-33 shows a basic dual link configuration that uses a KML.7, KML.8 or
KML.F module (KML A) in the DCE timing mode, with the timing taken from the
other main link (KML B). In conjunction, the remote MX-2100 connected to KML