DS26401 datasheet(238/309 Pages) DALLAS

238 / 309 page

DS26401 Octal T1/E1/J1 Framer

238

11.14.3 Mapping E1 Channels from a 1.544MHz Backplane

The user can use the TSCLKM bit in TIOCR.4 to enable the transmit elastic store to operate with a 1.544MHz

backplane (24 channels / frame + F bit). In this mode, the user can chose which of the E1 time slots will have all

ones data inserted by programming the Transmit Blank Channel Select registers (TBCS1-4). A logic 1 in the

associated bit location will cause the DS26401 elastic store to force all ones at the outgoing E1 data for that

channel. Typically, the user will want to program 8 channels to be 'blanked'. The default (power-up) configuration

will blank channels 25 to 32, so that the first 24 E1 channels are mapped from the 24 channels of the 1.544MHz

backplane.

TBCS1, TBCS2, TBCS3, TBCS4

Transmit Blank Channel Select Registers

1C0h, 1C1h, 1C2h, 1C3h [+ (200h x n) : where n = 0 to 7, for Ports 1 to 8]

(MSB)

(LSB)

CH8

CH7

CH6

CH5

CH4

CH3

CH2

CH1

TBCS1

CH16

CH15

CH14

CH13

CH12

CH11

CH10

CH9

TBCS2

CH24

CH23

CH22

CH21

CH20

CH19

CH18

CH17

TBCS3

CH32

CH31

CH30

CH29

CH28

CH27

CH26

CH25

TBCS4

Bits 0 to 7 / Transmit Blank Channel Select for Channels 1 to 32 (TBCS1 to 32)

0 = do not insert all ones for this channel

1 = insert all ones for this E1 channel

DS26401 Datasheet(PDF) 238 Page - Dallas Semiconductor

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