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Register Name:
Register Description:
Register Address:
Bit #
7
Name
DLB8
Default
0
Bit #
15
Name
DLB16
Default
0
Note: Bits that are underlined are read-only; all other bits are read-write.
Bits 0 to 15: T1/E1 Diagnostic Loopback Enable for Ports 1 to 16 (DLB1 to DLB16). These bits enable or
disable the T1/E1 Diagnostic Loopback (DLB). See the block diagrams in Section
loopback. DLB1 corresponds to T1/E1 Port 1, DLB2 corresponds to T1/E1 Port 2, and so on. If the device is
configured in Low-Speed T1/E1 Port Loop Timed mode (if LLTM bit in the MC1 register is set to a one) then only
data will be looped back—the clock will not be looped back. Since ports 4, 8, 12, 16, 20, 24, and 28 are not active
in the G.747 mode, the DLB4, DLB8, DLB12, and DLB16 bits have no effect in the G.747 mode.
0 = disable loopback
1 = enable loopback
Register Name:
Register Description:
Register Address:
Bit #
7
Name
DLB24
Default
0
Bit #
15
Name
—
Default
—
Note: Bits that are underlined are read-only; all other bits are read-write.
Bits 17 to 28: T1 Diagnostic Loopback Enable for Ports 17 to 28 (DLB17 to DLB28). These bits enable or
disable the T1 Diagnostic Loopback (DLB). See the block diagrams in Section
loopback. DLB1 corresponds to T17 Port 17, DLB18 corresponds to T1 Port 18, and so on. Since ports 17 to 28 are
not active in the E3 mode, these bits have no effect in the E3 mode. Since ports 4, 8, 12, 16, 20, 24, and 28 are not
active in the G.747 Mode, the DLB20, DLB24 and DLB28 bits have no affect in the G.747 mode. If the device is
configured in Low-Speed T1/E1 Port Loop Timed mode (if LLTM bit in the MC1 register is set to a one), then
only data will be looped back, the clock will not be looped back.
0 = disable loopback
1 = enable loopback
T1E1DLB1
T1/E1 Diagnostic Loopback Control Register 1
54h
6
5
DLB7
DLB6
0
0
14
13
DLB15
DLB14
0
0
T1E1DLB2
T1/E1 Diagnostic Loopback Control Register 2
56h
6
5
DLB23
DLB22
0
0
14
13
—
—
—
—
4
3
DLB5
DLB4
0
0
12
11
DLB13
DLB12
0
0
4
3
DLB21
DLB20
0
0
12
11
—
DLB28
—
0
72 of 133
2
1
DLB3
DLB2
0
0
10
9
DLB11
DLB10
0
0
1
for a visual description of this
2
1
DLB19
DLB18
0
0
10
9
DLB27
DLB26
0
0
1
for a visual description of this
DS3112
0
DLB1
0
8
DLB9
0
0
DLB17
0
8
DLB25
0
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