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ACS103

3 Channel, Synchronous or Asynchronous Single Fiber Modem

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ACS103 - 3 Channel, Synchronous or Asynchronous Single Fiber Modem

Acapella Optical Modem IC

ACS103

3 Channel, Synchronous or Asynchronous Single Fiber Modem

Main Features:

General Description:

* Enables three full-duplex serial transmission The ACS103 is a complete synchronous optical-

channels through a single fiber optic cable,

modem controller/driver IC, supporting various

user-programmable, full-duplex data-rates to

providing a virtual six fiber path.

256 kbps over a single fiber. Alternatively, up to 3

* Link lengths up to 5 km.

channels of 64 kbps each can be carried. In

'Standard' mode, the fiber may be up to 2.5 km long,

* Uses a single Ping Pong LED (PPLED) to both or up to 5 km in 'Double' mode.

transmit and receive data.

Communicating optical-modems automatically

*

Supports 7 synchronous data rates up to 64 kbps

maintain synchronisation with each other such that

the receive phase of one modem is lined-up with the

2

or asynchronous data rates from DC to 19.2/ transmit phase of the other, compensating for the

9.6 kbps.

propagation delay presented by the link. Link lengths

*

Supports three additional low frequency

from zero to maximum distance are catered for

automatically.

asynchronous channels or RS-232 handshake

signals: RTS, CTS, DTR and DSR.

The ACS103 incorporates ACS101 functionality, with

additional logic to support 3 channels.

* BER 10-9.

Inter-IC Encoding Technique

* Digital mode, allowing the user to add an

external amplifier. Also enables the ACS103 be

The 3B4B encoding method is used for

communication between ACS103s, thus ensuring

used in non-fiber applications e.g. IR/RF.

that there is no DC component in the signal. The

* ACS101 emulation mode giving 100 % encoding and decoding is transparent to the user.

compatibility with the ACS101.

Block diagram of ACS103

TxD1

TxD2

TxD3

TxCL

RxD1

RxD2

RxD3

RxCL

VA+

VD+

GND

Digital

Filter

FIFO

Compress

3B4B

Encoder

Digital

Filter

FIFO

Decompress

3B4B

Decoder

LED Driver

LED Receiver

RS-232 Interface

DCDB RTS CTS DTR DSR XI3 XO3 RSS

XI1 XO1 XI2 XO2

Control Logic

4

3

DR(1:4) DM(1:3)

CKC SEL

TRC

PPLED

LDP

LDN

CNT

GND

XTAL

1

ACS103 Issue 2.03 May 1996.

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