MSAN-128 Zarlink Semiconductor, Inc., MSAN-128 Datasheet - Page 6

• Manufacturer Part Number: MSAN-128
• Description: Implementing an ISDN Architecture Using the ST-BUS
• Manufacturer: Zarlink Semiconductor, Inc.

is that the interface looks exactly like an MT8972
interface to the rest of the system. This promotes
interchangeability of the devices at backplane
connections.
Figure 7 shows several applications of the MT8930
in the subscriber’s premises.
4.3
The S1 and S2 reference points are specified in
recommendation I.431.
based on the digital trunk specifications of the CCITT
G series. Zarlink components which can be used for
the S1 and S2 reference points are:
a) The MT8976, MH89760 ESF Digital Trunk
A-140
Interface for the 1544 kbit/s rate (S2).
Interfacing to the S1 and S2 Reference
Points (Primary Rate)
U
U
U
MT8972
MT8972
MT8972
CDSTo
CDSTo
CDSTo
CDSTi
CDSTi
CDSTi
DSTo
DSTo
DSTo
15
14
DSTi
DSTi
DSTi
0
F0o
F0o
F0o
C4
C4
C4
F0
F0
F0
Figure 6 - Typical Exchange, PBX or Multiplexer Configuration
BASIC RATE
This recommendation is
LINE CARD
ST-BUS
To other lines
To other
RATE CARD
lines
b) The MT8978, MH89780, MT8979 and MH89790
All the digital trunk interfaces comply with the Frame
formats specified in I.431, and support clear channel
operation.
extract clock information from the received signal.
This information is used for clocking in the received
information and for ST-BUS timing (in slave
applications). A complementary device, the MT8940
Digital Phase Locked Loop, is provided to lock
received timing to local timing if required (slave
applications). This device is also a convenient tool
for generating ST-BUS signals like clocks and frame
pulse,
synchronization (master systems).
PRIMARY
Digital Trunk Interfaces for the 2048 kbit/s rate
(S1).
µC
F0i
MT8940
C4b F0b
in
C8Kb
CVb
C2o
MATRICES OF
For timing purposes, the trunk circuits
systems
ROUTING
LAYERS
MATRIX
ENTITY
MT8980’s
2 & 3
F0i
C2i
C1.5i
E8Ko
F0i
C4i
DSTo DSTi
MH89760
MT8920
STPA
DSTo0
DSTo1
ST-BUS
that
CSTi1
CSTi0
DSTi
CSTo
ST-BUS
don’t
Application Note
require
S2
C
U
P
phase