sames
SA9101
FEATURES
PCM FRAME ALIGNER
1/40
n Frame alignment/synthesis for PCM30
double frame and CRC-multiframe
format.
n Meets CCITT Rec.G704
n Interface to route selectable between
HDB3 and fibre optical
n HDB3 outputs switchable between fully
bauded and half bauded format
n Error checking via CRC4 procedure
n Insertion and extraction of alarms and
facility signals
n Selectable system - clock (4096 kHz/
8192 kHz)
n Selectable Interface mode (2048/4096
kBit/s) to system internal highway
n Programmable offsets for receive and
transmit data
n Two frame receive buffer for receive
route clock wander and jitter
compensation
n Slip detection and direction indication
n Extended HDB3 error detection
M71-1797 PDS039-SA9101-001 REV.A 09-09-94
DESCRIPTION:
The SA9101 (Frame Alignment unit for PCM30 Systems) is a C-MOS device which
implements the interface to PCM30 Transmission Systems.
In the receive direction, the device performs HDB3 decoding, Frame alignment
(selectable between doubleframe and CRC-Multiframe) and extraction of signalling
data.
Wander absorption between the PCM carrier and the system internal highway is
performed using an internal 2 frame memory. The incoming data stream is monitored
and
n Error counters for code errors
(switchable to "S
i
zeros counter"), frame
errors and CRC4 errors
n Sub-multiframe assigned CRC Error
indication with possibility of automatic
insertion in Si-bit position of outgoing
multiframe.
n Simplified data transfer between
SA9101 and controller, supported by
data stacks for receive and transmit
signalling data, selectable interrupt-
sources and DMA facilities.
n Double frame marker for serial data
extraction support
n Repeated transmission of signalling
data, if not updated.
n Three transparent modes for timeslot 0
in transmit direction
n Transparent mode for receive direction
n HDB3 error indication
n Idle channel data insertion selectable
for any timeslot
n Channel loopback capabilities, test and
diagnostic capabilities
n Parity checks