DS2155G/T&R Maxim Integrated Products, DS2155G/T&R Datasheet - Page 28
DS2155G/T&R
Manufacturer Part Number
DS2155G/T&R
Description
Network Controller & Processor ICs T1/E1/J1 Single-Chip gle-Chip Transceiver
Manufacturer
Maxim Integrated Products
Datasheet
1.DS2155L.pdf
(238 pages)
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4.7 Line Interface Pins
Signal Name:
Signal Description:
Signal Type:
A (50ppm) clock source is applied at this pin. This clock is used internally for both clock/data recovery and for the
jitter attenuator for T1 and E1 modes. A quartz crystal of 2.048MHz can be applied across MCLK and XTALD
instead of the clock source. The clock rate can be 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz. When using
the DS2155 in T1-only operation, a 1.544MHz (50ppm) clock source can be used.
Signal Name:
Signal Description:
Signal Type:
A quartz crystal of 2.048MHz (optional 1.544MHz in T1-only operation) can be applied across MCLK and
XTALD instead of a clock source at MCLK. Leave open circuited if a clock source is applied at MCLK.
Signal Name:
Signal Description:
Signal Type:
An 8x clock that is locked to the recovered network clock provided from the clock/data recovery block (if
the jitter attenuator is enabled on the receive side) or from the TCLKI pin (if the jitter attenuator is
enabled on the transmit side).
Signal Name:
Signal Description:
Signal Type:
Connect low to separate the line interface circuitry from the framer/formatter circuitry and activate the
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins. Connect high to connect the line interface circuitry to the
framer/formatter circuitry and deactivate the TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins. When LIUC is
connected high, the TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins should be connected low.
Signal Name:
Signal Description:
Signal Type:
Analog inputs for clock recovery circuitry. These pins connect through a 1:1 transformer to the network. See
Section
Signal Name:
Signal Description:
Signal Type:
Analog line driver outputs. These pins connect through a 1:2 step-up transformer to the network. See Section
details.
24
for details.
MCLK
Master Clock Input
Input
XTALD
Quartz Crystal Driver
Output
8XCLK
Eight Times Clock (8x)
Output
LIUC
Line Interface Connect
Input
RTIP and RRING
Receive Tip and Ring
Input
TTIP and TRING
Transmit Tip and Ring
Output
28 of 238
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