ds2156gn Maxim Integrated Products, Inc., ds2156gn Datasheet - Page 79

• Manufacturer Part Number: ds2156gn
• Description: Ds2156, Ds2156l, Ds2156ln T1/e1/j1 Single-chip Transceiver Tdm/utopia Ii Interface
• Manufacturer: Maxim Integrated Products, Inc.

Bit 3/Local Loopback (LLB). In this loopback, data continues to be transmitted as normal through the transmit
side of the SCT. Data being received at RTIP and RRING are replaced with the data being transmitted. Data in this
loopback passes through the jitter attenuator. See Figure 2-2 for more details.
Bit 4/Line Interface Unit Mux Control (LIUC). This is a software version of the LIUC pin. When the LIUC pin
is connected high, the LIUC bit has control. When the LIUC pin is connected low, the framer and LIU are
separated and the LIUC bit has no effect
Bits 5 to 7/Unused, must be set to 0 for proper operation
LIUC Pin
0
0
1
1
0 = loopback disabled
1 = loopback enabled
0 = if LIUC pin connected high, LIU internally connected to framer block and deactivate the
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins
1 = if LIUC pin connected high, disconnect LIU from framer block and activate the
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins
LIUC Bit
0
1
0
1
LIU and framer separated
LIU and framer separated
LIU and framer connected
LIU and framer separated
Condition
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