Datasheet

DS26514 4-Port T1/E1/J1 Transceiver
19-5856; Rev 4; 5/11 239 of 305
Register Name:
LMCR
Register Description:
LIU Maintenance Control Register
Register Address:
1002h + (20h x (n - 1)) : where n = 1 to 4
Bit #
7
6
5
4
3
2
1
0
Name
TAIS
ATAIS
LB2
LB1
LB0
TPDE
RPDE
TE
Default
0
0
0
0
0
0
0
0
Bit 7: Manual Transmit AIS (TAIS). Alarm Indication Signal (AIS) is sent using MCLK as the reference clock. The
transmit data coming from the framer is ignored.
0 = TAIS is disabled.
1 = Output an unframed all-ones pattern (AIS) at TTIPn and TRINGn.
Bit : Automatic Transmit AIS (ATAIS)
0 = ATAIS is disabled.
1 = Automatically transmit AIS on the occurrence of an LIU LOS.
Bits 5 to 3: Loopback Selection (LB[2:0]. See Figure 9-28 for more details on each loopback.
LB2 LB1 LB0 Loopback Selection
0
0
0
No loopback selected
0
0
1
Remote Loopback 2 (includes jitter attenuator)
0
1
0
Analog Loopback
0
1
1
Remote Loopback 1 (no jitter attenuator)
1
0
0
Local Loopback (includes jitter attenuator)
1 0 1
Dual Loopback—Remote Loopback 1 and Local Loopback (jitter
attenuator is included in Local Loopback)
1
1
0
Reserved
1
1
1
Reserved
Bit 2: Transmit Power-Down Enable (TPDE)
0 = Transmitter power enabled.
1 = Transmitter powered down. TTIPn/TRINGn outputs are high impedance.
Bit 1: Receiver Power-Down Enable (RPDE)
0 = Receiver power enabled.
1 = Receiver powered down.
Bit 0: Transmit Enable (TE). This function is overridden by the TXENABLE pin.
0 = TTIPn/TRINGn outputs are high impedance.
1 = TTIPn/TRINGn outputs enabled.