
XRT84L38
375
REV. 1.0.1
u-law Digital Milliwatt code
IDLE code - an octet defined by the value stored in the User IDLE Code Register (UCR)
MOOF code - MUX-Out-Of-Frame code with hexadecimal value of 0x1A
PRBS code - an octet generated by the Pseudo-Random Bit Sequence (PRBS) Generator block of the
framer
OCTAL T1/E1/J1 FRAMER
Once again, configuration of the XRT84L38 framer to replace the received E1 payload data with the above-
mentioned coding schemes are controlled by the Receive Data Conditioning Select [3:0] bits of the Receive
Channel Control Register (RCCR) of each DS0 channel.
Finally, the XRT84L38 framer can configure any one or ones of the thirty two DS0 channels to be D or E
channels. D channel is used primarily for data link applications. E channel is used primarily for signaling for
circuit switching with multiple access configurations.
The Receive Data Conditioning Select [3:0] bits of the Receive Channel Control Register (RCCR) of each
channel determine whether that particular channel is configured as D or E channel.
The table below illustrates configurations of the Receive Data Conditioning Select [3:0] bits of the Receive
Channel Control Register (RCCR).
RECEIVE CHANNEL CONTROL REGISTER (RCCR) (INDIRECT ADDRESS = 0XN2H, 0X60H - 0X7FH)
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
3-0
Receive Condition-
ing Select
R/W
0000 - The received E1 payload data of this DS0 channel is unchanged.
0001 - All 8 bits of the input E1 payload data of this DS0 channel are
inverted.
0010 - The even bits of the input E1 payload data of this DS0 channel are
inverted.
0011 - The odd bits of the input E1 payload data of this DS0 channel are
inverted.
0100 - The input E1 payload data of this DS0 channel are replaced by the
octet stored in User IDLE Code Register (UCR).
0101 - The input E1 payload data of this DS0 channel are replaced by
BUSY code (0x7F).
0110 - The input E1 payload data of this DS0 channel are replaced by
VACANT code (0xFF).
0111 - The input E1 payload data of this DS0 channel are replaced by
BUSY_TS code (111xxxxx).
1000 - The input E1 payload data of this DS0 channel are replaced by
MUX-Out-Of-Frame (MOOF) code with value 0x1A.
1001 - The input E1 payload data of this DS0 channel are replaced by the
A-law digital milliwatt pattern.
1010 - The input E1 payload data of this DS0 channel are replaced by the
u-law digital milliwatt pattern.
1011 - The MSB bit of the input E1 payload data of this DS0 channel is
inverted.
1100 - All bits of the input E1 payload data of this DS0 channel except
MSB bit are inverted.
1101 - The input E1 payload data of this DS0 channel are replaced by
PRBS pattern created by the internal PRBS Generator of XRT84L38
framer.
1110 - The input E1 payload data of this DS0 channel is unchanged.
1111 - This channel is configured as D or E timeslot.