
DS3181/DS3182/DS3183/DS3184
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12.10 DS3/E3 Framer
12.10.1 Transmit DS3
The transmit DS3 uses two registers.
Table 12-33. Transmit DS3 Framer Register Map
ADDRESS
REGISTER
REGISTER DESCRIPTION
(1,3,5,7)18h
T3 Transmit Control Register
(1,3,5,7)1Ah
T3 Transmit Error Insertion Register
(1,3,5,7)1Ch
—
Reserved
(1,3,5,7)1Eh
—
Reserved
12.10.1.1 Register Bit Descriptions
Register Name:
T3.TCR
Register Description:
T3 Transmit Control Register
Register Address:
(1,3,5,7)18h
Bit #
15
14
13
12
11
10
9
8
Name
—
PBGE
TIDLE
CBGD
—
Default
0
Bit #
7
6
5
4
3
2
1
0
Name
—
TFEBE
AFEBED
TRDI
ARDID
TFGC
TAIS
Default
0
Bit 12: P-bit Generation Enable (PBGE) – When 0, Transmit Frame Processor P-bit generation is disabled. If
transmit frame generation is also disabled, the P-bit overhead periods in the incoming DS3 signal will be passed
through to overhead insertion. When 1, Transmit Frame Processor P-bit generation is enabled. The P-bit overhead
periods in the incoming DS3 signal will be overwritten even if transmit frame generation is disabled
Bit 11: Transmit DS3 Idle Signal (TIDLE) –
0 = Transmit DS3 Idle signal is not inserted
1 = Transmit DS3 Idle signal is inserted into the DS3 frame.
Bit 10: C-bit Generation Disable (CBGD) (M23 mode only) – When 0, Transmit Frame Processor C-bit
generation is enabled. The C-bit overhead periods in the incoming M23 DS3 signal will be overwritten with zeros.
When 1, Transmit Frame Processor C-bit generation is disabled. The C-bit overhead periods in the incoming M23
DS3 signal will be treated as payload, and passed through to overhead insertion. This bit is ignored in C-bit DS3
mode. Note: If CBGD = 1, PORT.CR1.NAD must also be set to 1.
Bit 5: Transmit FEBE Error (TFEBE) – When automatic far-end block error generation is defeated (AFEBED = 1),
the inverse of this bit is inserted into the bits C41, C42, and C43. Note: a far-end block error value of zero (TFEBE=1)
indicates a far-end block error. This bit is ignored in M23 DS3 mode.
Bit 4: Automatic FEBE Defeat (AFEBED) – When 0, a far-end block error is automatically generated based upon
the receive parity errors. When 1, a far-end block error is inserted from the register bit TFEBE. This bit is ignored in
M23 DS3 mode.
Bit 3: Transmit RDI Alarm (TRDI) – When automatic RDI generation is defeated (ARDID = 1), the inverse of this
bit is inserted into the X-bits (X1 and X2). Note: an RDI value of zero (TRDI=1) indicates an alarm.
Bit 2: Automatic RDI Defeat (ARDID) – When 0, the RDI is automatically generated based received DS3 alarms.
When 1, the RDI is inserted from the register bit TRDI.