Preliminary Data Sheet

AL2100

11/11/02

Broa d c om Co rp o r a ti o n

Document

AL2100-DS01-405-R

Sectio n 1: Over view

The AL2100 (Figure 2) contains a physical layer interface (PHY) for 100BASE-TX and a PHY for 100BASE-FX networks.

The PHY contains all the necessary functions such as elastic store, quantizer, and driver circuits to complete a media

converter design. The device converts the MLT3 scrambled symbols from the twisted-pair (TP) input port into 4B5B NRZI

encoded data, and transmits it over fiber media. The 4B5B NRZI encoded data from the fiber-input port is converted to a

scrambled MLT3 symbol stream for TP transmission.

The device also supports far-end fault detection (fiber-only) and link status propagation. If any port is in a link-fail state, the

device ceases to transmit data, and disables the appropriate output port. The device is transparent in regard to the

connecting links. The media converter uses an elastic store to retime the received signal.

The AL2100 supports redundant link applications. A redundant link can be formed by either a switch with a 100BASE-FX

transceiver that supports far-end fault signaling or two AL2100s. In the event of a link failure, the redundant link is established

automatically.

Figure 2: AL2100 Pin Out

30

31

32

33

34

35

36

25

26

27

28

29

AL2100

1

2

3

4

5

6

7

8

9

10

11

12

TXP

TXN

GND

RBIAD

GND

SD_A/FXEN_A

RXP

RXN

VCC

VCCPLL

GND

VCC

13

14

15

16

17

18

19

20

21

22

23

24

37

38

39

40

41

42

43

44

45

46

47

48

FIP

FIN

GND

ISO

VCC

GND

VCC

SD_BF/XEN_B

FOP

FON

FEF_DIS

FX2TP_DIS

48TQFP_7x7mm