In this section:

FXS Interface Card - Part Number 404-40179-nnn


Overview

The SBC 2000 FXS Interface Card comprises 24 FXS interfaces on a single RJ-21 connector. The SBC 2000 supports up to a maximum of 48 FXS ports using two FXS Interface Cards.

Interface Specifications and Limitations

Item

Value/Dimension

Maximum external Off-Hook resistance

600 ohms (This includes the resistance of the cable and the DC resistance of the termination device)

Typical Loop Current Limit

22 ma/port

Typical FXS Port Ringing Voltage

45V RMS with 3 REN load

Maximum Loop Length

3000m

Cable Gauge24 AWG

Dimensions and Weight

CardHeight mm/in. (PCB only) Width mm/in. (PCB only)Height mm/in. (Includes Connector overhang)Width mm/in. (Includes Connector overhang)Total Weight (lbs)
FXS200.0/7.87275.0/10.83249.7/9.83307.5/12.110.9

Environmental Ranges (Operation and Storage)

Environmental Parameter

Specification

Operating Environmental Conditions

Temperature: 5º to 40º Celsius
Humidity: 5% to 85% RH non-condensing
Altitude: 60 meters below sea level to 1800 meters above sea level

Storage Environmental Condition

Temperature: -40º to 70º Celsius


RJ-21 Connector Pinouts

RJ-21 Connector Pinouts

 

RJ-21 connector pinout: 

Port Number

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

TIP

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

RING

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

The last pair of the RJ-21 connector (pins 25 and 50) are routed to an isolated contact to be used for a future feature.

Circuit Protection

Protection circuits are included on the FXS card. The FXS circuit on the SBC 2000 meets the requirements of UL/EN60950.

The FXS circuits also include fusing and protection devices to comply with the following:

  • Telcordia GR-1089
  • ITU-T K.20/K.21

Installation and Service

The SBC 2000FXS Interface card have no user serviceable components. Installation and removal of of the SBC 2000 FXS Interface Card from the chassis should only be performed by qualified service personnel.