RFL IMUX 2000 - 5.6.1 SYNCHRONIZED E1 SYSTEMS

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5.6.1 SYNCHRONIZED E1 SYSTEMS
Multiple IMUX 2000 systems can be synchronized by deriving their timing from the same timing
source. One way to accomplish this is to daisy-chain the external timing outputs and inputs of several
head-end terminal multiplexers (Figure 5-12). Note that multiple IMUX 2000 systems loop-timed to
the same network are also synchronized, both to each other and to the network. E1 systems are
synchronized to prevent buffer overflows or underflows, generally called "slips", in the network
switching systems such as digital central offices, PBXs, and digital cross-connect systems.
IMUX 2000E1 RFL Electronics Inc.
NETWORK
(ELECTRICAL
OR FIBER)
E1
NETWORK
(ELECTRICAL
OR FIBER)
NETWORK
(ELECTRICAL
OR FIBER)
STATION
Figure 5-12. Multiple systems synchronized to a common timing source
CLOCK
OTHE
OR
R
G
2.041 mHz
TIMIN
SOURCE
E1
E1
E1 E1
E1
LOCATION 1
LOCATION 2
LOCATION 3
LOCATION 4
LOOP
TIMED
LOOP
TIMED
LOOP
TIMED
IMUX 2000
IMUX 2000
IMUX 2000
EXTERNALLY
TIMED
EXTERNALLY
TIMED
EXTERNALLY
TIMED
IMUX
2000
IMUX
2000
IMUX
2000
TIMING
TIMING
TIMING
EXTERNAL
TIMING
OUTPUT
EXTERNAL
TIMING
INPUT
EXTERNAL
TIMING
INPUT
EXTERNAL
TIMING
OUTPUT
EXTERNAL
TIMING
INPUT
TIMING
TIMING
January 1, 2008 5-13 (973) 334-3100