DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver

10.9.3.2 E1 Mode

In E1 mode, TS16 carries the signaling information. This information can be in either CCS (common channel signaling) or CAS (channel associated signaling) format. The 32 time slots are referenced by two different channel number schemes in E1. In “Channel” numbering, TS0–TS31 are labeled channels 1 through 32. In “Phone Channel” numbering, TS1–TS15 are labeled channel 1 through channel 15 and TS17–TS31 are labeled channel 15 through channel 30. In E1 CAS mode, the CAS signaling alignment/alarm byte can be sourced from the transmit signaling registers along with the signaling data.

Table 10-9. Time Slot Numbering Schemes

TS

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Channel

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

Phone

 

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

 

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Channel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10.9.4 Hardware-Based Transmit Signaling

In hardware-based mode, signaling data is input through the TSIG pin. This signaling PCM stream is buffered and inserted to the data stream being input at the TSERI pin.

Signaling data can be inserted on a per-channel basis by the transmit hardware-signaling channel-select (THSCS) function. The user has the ability to control which channels are to have signaling data from the TSIG pin inserted into them on a per-channel basis. See Section 10.2 for details on using this per-channel (THSCS) feature. The signaling insertion capabilities of the framer are available whether the transmit-side elastic store is enabled or disabled. If the elastic store is enabled, the backplane clock (TSYSCLK) can be either 1.544MHz or 2.048MHz. Also, if the elastic is enabled in conjunction with transmit hardware signaling, CCR3.7 must be set = 0.

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Maxim DS33R11 Time Slot Numbering Schemes, Hardware-Based Transmit Signaling, 10.9.3.2 E1 Mode, Channel Phone