Acapella Optical Modem IC
ACS401 Main Features:
LED Driver
4 3 4
PIN ReceiverRxD1
RxCL
RxD4
RxD3
RxD2
VA+
VD+
GND
TxCL
FIFO
Compress
Digital
Filter
3B4B
Encoder
TxD4
TxD3
TxD2
TxD1
FIFO
Decompress
3B4B
Decoder
Digital
Filter
GND
CNT
XTAL
PINN
PINP
LAP
StatusControl Data Control Logic
LAN
PPLED
Single
Fiber
TRC
Equivalent block diagram of ACS401.
XO1 XI1 XO2 XI2 HBT CLK9 ERRC ERRL DR(1:3) DM(1:3) DP(1:4) PORB CKC
The ACS401 is a complete optical-modem controller/
driver/receiver IC, supporting various user programmable, full-
duplex, synchronous data rates to 128 kbps over a single fiber.
Communicating modems automatically maintain synchronis-
ation with each other such that the receive phase of one modem
is lined up with the transmit phase of the other, compensating for
the propagation delay presented by the link. Link lengths from
zero to maximum distance, up to 95 km, are catered for
automatically.
General Description:
* Enables up to four full-duplex serial transmission channels
through a single fiber optic cable, providing eight virtual fiber
paths.
* Two additional low speed handshake signals.
* Supports Ping Pong LED (PPLED) and LASER Duplex
Devices (LDD) for single fiber applications or dual fiber
applications using low cost LED/LASER emitters and PIN
Diode receiver.
* Link lengths up to 95 km with appropriate Laser.
* Maximum data rate 128 kbps - optimised for talk-set
applications.
* Typical 7 mA (average) current consumption, including
LASER drive current.
* Digital mode, allowing the user to add an external amplifier.
Also enables the ACS401 to be used in non-fiber applications.
* Bit Error Rate (BER) of 10-9