DS2154 datasheet(46/87 Pages) DALLAS

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DS2154

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7.0 SIGNALING OPERATION

The DS2154 contains provisions for both processor-based (i.e., software based) signaling bit access and

for hardware based access. Both the processor-based access and the hardware-based access can be used

simultaneously if necessary. The processor-based signaling is covered in Section 7.1 and the hardware-

based signaling is covered in Section 7.2.

7.1 PROCESSOR-BASED SIGNALING

The Channel Associated Signaling (CAS) bits embedded in the E1 stream can be extracted from the

receive stream and inserted into the transmit stream by the DS2154. Each of the 30 voice channels has

four signaling bits (A/B/C/D) associated with it. The numbers in parenthesis () are the voice channel

associated with a particular signaling bit. The voice channel numbers have been assigned as described in

the ITU documents. Please note that this is different than the channel numbering scheme (1 to 32) that is

used in the rest of the data sheet. For example, voice channel 1 is associated with timeslot 1 (Channel 2)

and voice Channel 30 is associated with timeslot 31 (Channel 32). There is a set of 16 registers for the

receive side (RS1 to RS16) and 16 registers on the transmit side (TS1 to TS16). The signaling registers

are detailed below.

RS1 TO RS16: RECEIVE SIGNALING REGISTERS (Address=30 to 3F Hex)

(MSB)

(LSB)

0000

XYXX

RS1 (30)

A(1)

B(1)

C(1)

D(1)

A(16)

B(16)

C(16)

D(16)

RS2 (31)

A(2)

B(2)

C(2)

D(2)

A(17)

B(17)

C(17)

D(17)

RS3 (32)

A(3)

B(3)

C(3)

D(3)

A(18)

B(18)

C(18)

D(18)

RS4 (33)

A(4)

B(4)

C(4)

D(4)

A(19)

B(19)

C(19)

D(19)

RS5 (34)

A(5)

B(5)

C(5)

D(5)

A(20)

B(20)

C(20)

D(20)

RS6 (35)

A(6)

B(6)

C(6)

D(6)

A(21)

B(21)

C(21)

D(21)

RS7 (36)

A(7)

B(7)

C(7)

D(7)

A(22)

B(22)

C(22)

D(22)

RS8 (37)

A(8)

B(8)

C(8)

D(8)

A(23)

B(23)

C(23)

D(23)

RS9 (38)

A(9)

B(9)

C(9)

D(9)

A(24)

B(24)

C(24)

D(24)

RS10 (39)

A(10)

B(10)

C(10)

D(10)

A(25)

B(25)

C(25)

D(25)

RS11 (3A)

A(11)

B(11)

C(11)

D(11)

A(26)

B(26)

C(26)

D(26)

RS12 (3B)

A(12)

B(12)

C(12)

D(12)

A(27)

B(27)

C(27)

D(27)

RS13 (3C)

A(13)

B(13)

C(13)

D(13)

A(28)

B(28)

C(28)

D(28)

RS14 (3D)

A(14)

B(14)

C(14)

D(14)

A(29)

B(29)

C(29)

D(29)

RS15 (3E)

A(15)

B(15)

C(15)

D(15)

A(30)

B(30)

C(30)

D(30)

RS16 (3F)

SYMBOL

POSITION

NAME AND DESCRIPTION

RS1.0/1/3

Spare Bits.

RS1.2

Remote Alarm Bit (integrated and reported in SR1.6).

A(1)

RS2.7

Signaling Bit A for Channel 1.

D(30)

RS16.0

Signaling Bit D for Channel 30.

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