Lucent Technologies Inc.
Lucent Technologies Inc.
147
Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II)
Line Interface Control Registers
(continued)
LIU Configuration Register (LIU_REG5)
The control bits in the channel configuration register 5 are used to select powerdown mode, AIS generation, and
loopbacks for the LIU. The PWRDN and XLAIS bits are active-high. This is a read/write register. The default value
of this register is 02 (hex).
Table 83. LIU Configuration Register (LIU_REG5) (405, A05)
Table 84. Loopback Control (from Table 11)
* The reset default condition is LOOPA = LOOPB = 0 (no loopback).
During the transmit AIS condition, the looped data will be the transmitted data from the framer or system interface and not the all ones signal.
Transmit AIS request is ignored.
LIU Configuration Register (LIU_REG6)
The control bits in the channel configuration register 6 are used to select LIU transmit equalization settings. This is
a read/write register. The default value of this register is 00 (hex) in DS1 when DS1/CEPT (pin 40/142) is set to 1,
and 06 (hex) in CEPT when DS1/CEPT (pin 40/142) is set to 0.
Table 85. LIU Configuration Register (LIU_REG6) (406, A06)
Bit
0
1
Symbol
PWRDN
XLAIS
Description
PWRDN = 1 activates powerdown.
XLAIS = 1 enables transmission of an all ones signal to the line interface. XLAIS = 1
after a reset allowing immediate generation of alarm signal as long as a clock
source is present. The default value is XLAIS = 1.
The LOOPA bit is used in conjunction with LOOPB to select the channel loopback
modes. See Table 11, repeated below for reference.
Reserved.
Write to 0.
2
3
LOOPB
LOOPA
—
4—7
Operation
Symbol
LOOPA
LOOPB
Normal
*
Full Local Loopback
Remote Loopback
Digital Local Loopback
—
0
0
1
1
0
1
0
1
FLLOOP
RLOOP
DLLOOP
Bit
0
1
2
Symbol
EQ0
EQ1
EQ2
Description
The EQ0, EQ1, and EQ2 bits select the type of service (DS1 or CEPT) and the
associated transmitter cable equalization/line build out/termination impedances.
See Table 7, Transmit Line Interface Short-Haul Equalizer/Rate Control, repeated
below for reference.
Reserved.
Write to 0.
3—7
—