MT9041B Mitel Networks Corporation, MT9041B Datasheet - Page 9

• Manufacturer Part Number: MT9041B
• Description: T1/E1 System Synchronizer
• Manufacturer: Mitel Networks Corporation

Advance Information
Multiple E1 Reference Sources with MT9041B
In this example 8 E1 link framers (MT9074) are
connected to a common system backplane clock
using the MT9041B. Each of the extracted clocks
E1.5o go to a mux which selects one of the eight
input clocks as the reference to the MT9041B. The
clock choice is made by a controller using the loss of
signal pin LOS from the MT9074s to qualify potential
references. In the event of loss of signal by one of
the framers, an interrupt signals the controller to
choose a different reference clock. Disturbances in
the generated system backplane clocks C4b and F0b
are minimized by the phase slope limitations of the
MT9041B PLL. This ensures system integrity and
minimizes
downstream trunks.
the
TTIP
TRING
RTIP
RRING
TTIP
TRING
RTIP
RRING
effect
MT9074
MT9074
E1.5o
E1.5o
LOS
LOS
C4b
C4b
F0i
F0i
of
Figure 9 - Multiple E1 Reference Sources with MT9041B
To Controller
clock
Interrupt
switchover
To Controller
Interrupt
on
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
1 TO 8
MUX
OUT
10nF
REF
C4o
1k
F0o
RST
10k
MT9041B
OSCi
FS1
FS2
+ 5V
MS
+ 5V
20MHz
MT9041B
20MHz 32ppm
Out
CLOCK
9