DS2152
pattern. The RCR2.7 bit will determine which code is used. The digital milliwatt code is an 8-byte
repeating pattern that represents a 1 kHz sine wave (1E/0B/0B/1E/9E/8B/8B/9E). Each bit in the RMRs
represents a particular channel. If a bit is set to a 1, then the receive data in that channel will be replaced
with one of the two codes. If a bit is set to 0, no replacement occurs.
RMR1/RMR2/RMR3: RECEIVE MARK REGISTERS (Address=2D to 2F Hex)
(MSB)
CH8
CH16
CH24
(LSB)
CH1
CH9
CH7
CH15
CH23
CH6
CH14
CH22
CH5
CH13
CH21
CH4
CH12
CH20
CH3
CH11
CH19
CH2
CH10
CH18
RMR1(2D)
RMR2(2E)
RMR3(2F)
CH17
SYMBOL
POSITION NAME AND DESCRIPTION
CH24
RMR3.7
RMR1.0
Receive MARK Registers.
0=do not affect the receive data associated with this channel
CH1
1=replace the receive data associated with this channel with
either the idle code or the digital milliwatt code (depends on the
RCR2.7 bit)
8.2.2 Per-Channel Code Insertion
The second method involves using the Receive Channel Control Registers (RCC1/2/3) to determine
which of the 24 T1 channels off of the T1 line and going to the backplane should be overwritten with the
code placed in the Receive Channel Registers (RC1 to RC24). This method is more flexible than the first
in that it allows a different 8-bit code to be placed into each of the 24 T1 channels.
RC1 TO RC24:
RECEIVE CHANNEL REGISTERS (Address=58 to 5F and 80 to 8F Hex)
(for brevity, only channel 1 is shown; see Table 1-3 for other register address)
(MSB)
(LSB)
C7
C6
C5
C4
C3
C2
C1
C0
RC1 (58)
SYMBOL
POSITION NAME AND DESCRIPTION
C7
C0
RC1.7
RC1.0
MSB of the Code (this bit is sent first to the backplane)
LSB of the Code (this bit is sent last to the backplane)
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DALLAS [ DALLAS SEMICONDUCTOR ]
