DS26521 datasheet(210/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

210 of 258

LRISMR

LIU Receive Impedance and Sensitivity Monitor Register

1007h

Bit #

Name

RG703

RIMPOFF

RIMPM1

RIMPM0

RTR

RMONEN

RSMS1

RSMS0

Default

Bit 7: Receive G.703 Clock Enable (RG703). If this bit is set, the receiver expects a 2.048MHz or 1.544MHz

clock from the RTIP/RRING, based on the selection of T1 (1.544) or E1 (2.048) mode in the LTRCR register.

Bit 6: Receive Impedance Termination Off (RIMPOFF).

0 = Receive terminating impedance match is enabled.

1 = Receive terminating impedance match is disabled.

Bits 5 and 4: Receive Impedance Match 1 and 0 (RIMPM[1:0]).These bits are used to select the receive

impedance match value. These must be set according to the cable impedance. Even if the internal receive match

impedance is turned off (RIMPOFF); the external cable impedance must be specified for optimum operation by

RIMPM1 to 0. See Table 9-18.

Bit 3: Receiver Turns Ratio (RTR).

0 = Receive transformer turns ratio is 1:1.

1 = Receive transformer turns ratio is 2:1. This option should only be used in short-haul applications.

Bit 2: Receiver Monitor Mode Enable (RMONEN).

0 = Disable receive monitor mode.

1 = Enable receive monitor mode. Resistive gain is added with the maximum sensitivity. The receiver

sensitivity is determined by RSMS1 and RSMS0.

Bits 1 and 0: Receiver Sensitivity/Monitor Gain Select 1 and 0 (RSMS[1:0]). These bits are used to select the

receiver sensitivity level and additional gain in monitoring applications. The monitor mode (RMONEN) adds

resistive gain to compensate for the signal loss caused by the isolation resistors. See Table 9-19 and Table 9-20.

Table 9-18. Receive Impedance Selection

RIMPM[1:0]

RECEIVE IMPEDANCE

SELECTED (

Ω)

100

110

120

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