MH89790B
Data sheet
UI
36.90
20.50
P
E
10.0
A
K
•
8.00
T
O
•
➀
P
E
A
K
2.50
➀
J
I
1.5
T
T
E
R
S
1.00
0.54
(SINUSOIDAL)
0.20
20 Hz
2.4 kHz
18 kHz
10 K
12 x 10-8
1 Hz
10 Hz
100 Hz
JITTER FREQUENCY
1 K
100 K
Figure 13 - Input Jitter Tolerance of MH89790B
➀ - Maximum jitter tolerance of receiver
➀ - Minimum jitter tolerance specified by G.823 and I.431
Applications
The extracted 8 kHz output (E8Ko) is derived from E2o
clock by dividing it by 256. It can be used by an external
phase-locked loop to generate the system clock and frame
pulse that is synchronized to the network (see Figure 15).
ISDN Primary Rate User Network Interface
Typical examples of primary rate interfaces are high
capacity links from a PBX to a Central Office Exchange
or multiple links between PBX’s in a large private
network. With the advent of Integrated Services Digital
Networks (ISDN) a limited set of network interfaces is
specified to allow equipment from different vendors to
operate in the network. The MH89790B conforms to the
ISDN S/T Primary Rate reference point standard, which
calls for 30 B channels (64 kbit/s) and one D channel (64
kbit/s). Figure 15 illustrates a typical application of the
MH89790B in an ISDN environment.
Three types of information are passed through serial
busses of the MH89790B:
USER DATA - The data streams of the MH89790B are
shown connected to the MT8980 Digital Crosspoint
Switch. This allows voice and data channels to be
switched dynamically within the system.
16
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
