DS26521 datasheet(183/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

183 of 258

TCR2 (T1 Mode)

Transmit Control Register 2

182h

Bit #

Name

TFDLS

TSLC96

—

FBCT2

FBCT1

TD4RM

PDE

TB7ZS

Default

Note: See TCR2 for E1 mode.

Bit 7: TFDL Register Select (TFDLS).

0 = source FDL or Fs bits from the internal TFDL register or the SLC-96 data formatter (TCR2.6)

1 = source FDL or Fs bits from the internal HDLC controller

Bit 6: Transmit SLC-96 (TSLC96). Set this bit to a one in SLC-96 framing applications. Must be set to source the

SLC-96 alignment pattern and data from the T1TSLC1:T1TSLC3 registers. See Section 8.9.4.4 for details.

0 = SLC-96 insertion disabled

1 = SLC-96 insertion enabled

Bit 4: F-Bit Corruption Type 2 (FBCT2). Setting this bit high enables the corruption of one Ft (D4 framing mode)

or FPS (ESF framing mode) bit in every 128 Ft or FPS bits as long as the bit remains set.

Bit 3: F-Bit Corruption Type 1 (FBCT1). A low-to-high transition of this bit causes the next three consecutive Ft

(D4 framing mode) or FPS (ESF framing mode) bits to be corrupted causing the remote end to experience a loss of

synchronization.

Bit 2: Transmit D4 RAI Select (TD4RM).

0 = zeros in bit 2 of all channels

1 = a one in the S-bit position of frame 12

Bit 1: Pulse Density Enforcer Enable (PDE). The framer always examines both the transmit and receive data

streams for violations of the following rules which are required by ANSI T1.403: no more than 15 consecutive zeros

and at least N ones in each and every time window of 8 x (N +1) bits where N = 1 through 23. Violations for the

transmit and receive data streams are reported in the TLS1.3 and RLS2.7 bits, respectively. When this bit is set to

one, the DS26521 will force the transmitted stream to meet this requirement no matter the content of the

transmitted stream. When running B8ZS, this bit should be set to zero since B8ZS-encoded data streams cannot

violate the pulse density requirements.

0 = disable transmit pulse density enforcer

1 = enable transmit pulse density enforcer

Bit 0: Transmit-Side Bit 7 Zero-Suppression Enable (TB7ZS).

0 = no stuffing occurs

1 = force bit 7 to a one as determined by the GB7S bit at TCR1.3

DS26521 Datasheet(PDF) 183 Page - Maxim Integrated Products

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