XRT86VL32IB datasheet(43/154 Pages) EXAR

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XRT86VL3X

REV. 1.2.3

T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

Figure 36 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.

4.1.4

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).

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 37 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 36. DS1 TRANSMIT OVERHEAD INPUT TIMING IN N OR SLC®96 FRAMING FORMAT MODE

TRANSMIT DATA LINK SELECT REGISTER (TDLSR) (ADDRESS = 0XN10AH)

BIT

NUMBER

BIT NAME

BIT TYPE

BIT DESCRIPTION

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.

FIGURE 37. DS1 TRANSMIT OVERHEAD INPUT INTERFACE MODULE IN T1DM FRAMING FORMAT MODE

XRT86VL32IB Datasheet(PDF) 43 Page - Exar Corporation