XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. 1.0.1
Figure 38 below shows the timing diagram of the input and output signals associated with the DS1 Transmit
Overhead Input Interface module in N or SLC®96 framing format mode.
FIGURE 38. DS1 TRANSMIT OVERHEAD INPUT TIMING IN N OR SLC®96 FRAMING FORMAT MODE
7.1.4
Configure the DS1 Transmit Overhead Input Interface module as source of the Remote
Signaling (R) bits in T1DM framing format mode
The R bits in T1DM framing format mode can be inserted from:
•
•
•
DS1 Transmit Overhead Input Interface Block
DS1 Transmit HDLC Controller
DS1 Transmit Serial Input Interface.
The Transmit Data Link Source Select bits of the Transmit Data Link Select Register (TDLSR) controls the
insertion of data link bits into the R bits in T1DM framing format mode. The table below shows configuration of
the Transmit Data Link Source Select bits of the Transmit Data Link Select Register (TDLSR).
TRANSMIT DATA LINK SELECT REGISTER (TDLSR) (ADDRESS = 0X010AH)
B
IT
B
IT
N
AME
B
IT
TYPE
BIT DESCRIPTION
N
UMBER
1-0
Transmit Data Link
Source Select
R/W
00 - The Remote Signaling bits are inserted into the framer through either
the LAPD controller or the SLC®96 buffer.
01 - The Remote Signaling bits are inserted into the framer through the
Transmit Serial Data input Interface via the TxSer_n pins.
10 - The Remote Signaling bits are inserted into the framer through the
Transmit Overhead Input Interface via the TxOH_n pins.
11 - The Remote Signaling bits are forced to one by the framer.
If the Transmit Data Link Source Select bits of the Transmit Data Link Select Register are set to 10, the
Transmit Overhead Input Interface Block becomes input source of the R bits. Since R bit presents in Timeslot
24 of every T1DM frame, therefore, bandwidth of T1DM data link channel is 8KHz.
Figure 39 below shows the timing diagram of the input and output signals associated with the DS1 Transmit
Overhead Input Interface module in T1DM framing format mode.
FIGURE 39. DS1 TRANSMIT OVERHEAD INPUT INTERFACE MODULE IN T1DM FRAMING FORMAT MODE
7.2
DS1 Receive Overhead Output Interface Block
173
EXAR [ EXAR CORPORATION ]
