Rainbow Electronics DS26503 User Manual

Page 84

DS26503 T1/E1/J1 BITS Element

84 of 123

LIC2

Line Interface Control 2

31h

Bit

# 7 6 5 4 3 2 1 0

Name —

LIRST

IBPV

TAIS

JACKS

—

SCLD

CLDS

Default

0 0 0 0 0 0 0 0

HW
Mode

0 0 0

TAIS

PIN 10

JACKS

PIN 46

0 0 0

Bit 0/Custom Line Driver Select (CLDS). Setting this bit to a one will redefine the operation of the transmit line driver.
When this bit is set to a one and LIC1.5 = LIC1.6 = LIC1.7 = 0, then the device will generate a square wave at the TTIP and
TRING outputs instead of a normal waveform. When this bit is set to a one and LIC1.5 = LIC1.6 = LIC1.7

¹ 0, then the device

will force TTIP and TRING outputs to become open-drain drivers instead of their normal push-pull operation. This bit should
be set to zero for normal operation of the device.

Bit 1/Short Circuit Limit Disable (in E1 mode) (SCLD). Controls the 50mA (rms) current limiter.

0 = enable 50mA current limiter
1 = disable 50mA current limiter

Bit 2/Unused, must be set = 0 for proper operation.

Bit 3/Jitter Attenuator Mux (JACKS). Controls the source for JA CLOCK. This bit is only used in T1 mode.

0 = JA CLOCK sourced from the pre-scaled MCLK
1 = JA CLOCK sourced from internal PLL

Bit 4/Transmit Alarm Indication Signal (TAIS).

0 = transmit an unframed all-ones code
1 = transmit data normally

Bit 5/Insert BPV (IBPV). A zero-to-one transition on this bit will cause a single BPV to be inserted into the transmit data
stream. Once this bit has been toggled from a zero to a one, the device waits for the next occurrence of three consecutive ones
to insert the BPV. This bit must be cleared and set again for a subsequent error to be inserted.

Bit 6/Line Interface Reset (LIRST). Setting this bit from a zero to a one will initiate an internal reset that resets the clock
recovery state machine and recenters the jitter attenuator. Normally this bit is only toggled on power-up. Must be cleared and
set again for a subsequent reset.

Bit 7/Unused, must be set = 0 for proper operation.