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DS2180AQN

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P35
DS2180A
7 of 35
ACB: ADDRESS COMMAND BYTE Figure 4
(MSB) (LSB)
- FRSR2 EYELMD FM SYELMD B8ZS B7 LPBK
SYMBOL POSITION NAME AND DESCRIPTION
- CCR.7 Reserved, must be 0 for proper operation.
FRSR2 CCR.6
Function of REC Status Register 2.
0 = Detected B8ZS code words reported at RSR.2.
1 = COFA (Change-of-Frame Alignment) reported at RSR.2 when
last resync resulted in change of frame or multiframe alignment.
EYELMD CCR.5
193E Yellow Mode Select.
0 = Yellow alarm is a repeating pattern set of 00 hex and FF hex.
1 = Yellow alarm is a 0 in the bit 2 position of all channels.
FM CCR.4
Frame Mode Select.
0 = D4 (193S, 12 frames/superframe).
1 = Extended (193E, 24 frames/superframe).
SYELMD CCR.3 193S Yellow Mode Select. Determines yellow alarm type to be
transmitted and detected while in 193S framing. If set, yellow
alarms are a 1 in the S-bit position of frame 12; if cleared, yellow
alarm is a 0 in bit 2 of all channels. Does not affect 193E yellow
alarm operation.
B8ZS
CCR.2
Bipolar eight zero substitution.
0 = No B8ZS.
1 = B8ZS enabled.
(Note: This bit must be set to 0 when CCR.1=1)
B7 CCR.1
Bit seven zero suppression. If CCR.1=1, channels with an all zero
content will be transmitted with bit 7 forced to 1. If CCR.1=0, no
bit 7 stuffing occurs.
(Note: This bit must be set to 0 when CCR.2=1)
LPBK
CCR.0 Loopback. When set, the device internally loops output transmit
data into the incoming receive data buffers and TCLK is internally
substituted for RCLK.
LOOPBACK (Refer to Figure 4)
Enabling loopback will typically induce an out-of-frame (OOF) condition. If appropriate bits are set in
the receive control register, the receiver will resync to the looped transmit frame alignment. During the
looped condition, the transmit outputs (TPOS, TNEG) will transmit unframed all 1's. All operating modes
(B8ZS, alarm, signaling, etc.) except for blue alarm transmission are available in loopback.
BIT SEVEN STUFFING
Existing systems meet 1's density requirements by forcing bit 7 of all zero channels to 1. Bit 7 stuffing is
globally enabled by asserting bit CCR.1 and may be disabled on an individual channel basis by setting
appropriate bits in TTR1–TTR3. Bit 7 stuffing and B8ZS modes should not be enabled simultaneously.
Enabling both results in LOS.
DS2180A
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B8ZS
The DS2180A supports existing and emerging zero suppression formats. Selection of B8ZS coding
maintains system 1’s density requirements without disturbing data integrity as required in emerging clear
channel applications. B8ZS coding replaces eight consecutive outgoing 0's with a B8ZS code word. Any
received B8ZS code word is replaced with all 0’s. B8ZS and bit 7 stuffing modes should not be enabled
simultaneously. Enabling both results in LOS.
TCR: TRANSMIT CONTROL REGISTER Figure 5
(MSB) (LSB)
ODF TFPT TCP RBSE TIS 193SI TBL TYEL
SYMBOL POSITION NAME AND DESCRIPTION
ODF TCR.7
Output Data Format.
0 = Bipolar data at TPOS and TNEG.
1 = NRZ data at TPOS; TNEG=0.
TFPT TCR.6
Transmit Framing Pass-through.
0 = FT/FPS sourced internally.
1 = FT/FPS sampled at TSER during F-bit time.
TCP TCR.5
Transmit CRC Pass-through.
0 = Transmit CRC code internally generated.
1 = TSER sampled at CRC F-bit time for external CRC insertion.
RBSE TCR.4
Robbed Bit Signaling Enable.
1 = Signaling inserted in all channels during signaling frames.
0 = No signaling inserted. (The TTR registers allow the user to
disable signaling insertion on selected DS0 channels.)
TIS TCR.3
Transmit Idle Code Select. Determines idle code format to be
inserted into channels marked by the TIR registers.
0 = Insert 7F (Hex) into marked channels.
1 = Insert FF (Hex) into marked channels.
193SI
TCR.2
193S S-bit Insertion. Determines source of transmitted S-bit.
0 = Internal S-bit generator.
1 = External (sampled at TLINK input).
TBL TCR.1
Transmit Blue Alarm.
0 = Disabled.
1 = Enabled.
TYEL
TCR.0
TYEL TCR.0 Transmit Yellow Alarm.
0 = Disabled.
1 = Enabled.
TRANSMIT BLUE ALARM
The blue alarm (also known as the AIS, Alarm Indication Signal) is an unframed, all 1’s sequence
enabled by asserting TCR.1. Blue alarm overrides all other transmit data patterns and is disabled by
clearing TCR.1. Use of the TIR registers allows a framed, all 1’s alarm transmission if required by the
network.
TRANSMIT YELLOW ALARM
In 193E framing, a yellow alarm is a repeating pattern set of FF(Hex) and 00 (Hex) on the 4 kHz facility
data link (FDL). In 193S framing the yellow alarm format is dependent on the state of bit CCR.3. In all
modes, yellow alarm is enabled by asserting TCR.0 and disabled by clearing TCR.0.
DS2180A
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TRANSMIT SIGNALING
When enabled (via TCR.4) channel signaling is inserted in frames 6 and 12 (193S) or in frames 6, 12, 18
and 24 (193E) in the 8
th
bit position of every channel word. Signaling data is sampled at TABCD on the
falling edge of TCLK during bit 8 of each input word during signaling frames. Logical combination of
clocks TMO, TSIGFR and TSIGSEL allows external multiplexing of separate serial links for A, B or A,
B, C, D signaling sources.
TTR1–TTR3: TRANSMIT TRANSPARENCY REGISTERS Figure 6
(MSB) (LSB)
CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 TIR1
CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9 TIR2
CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17 TIR3
SYMBOL POSITION NAME AND DESCRIPTION
CH24 TTR3.7
CH1 TTR1.0
Transmit Transparent Registers. Each of these bit positions
represents a DS0 channel in the outgoing frame. When set, the
corresponding channel is transparent.
TIR1–TIR3: TRANSMIT IDLE REGISTERS Figure 7
(MSB) (LSB)
CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 TIR1
CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9 TIR2
CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17 TIR3
SYMBOL POSITION NAME AND DESCRIPTION
CH24 TIR3.7
CH1 TIR1.0
Transmit Idle Registers. Each of these bit positions represents a
DS0 channel in the outgoing frame. When set, the corresponding
channel will output an idle code format determined by TCR.2.
TRANSMIT CHANNEL TRANSPARENCY
Individual DS0 channels in the T1 frame may be programmed clear (no inserted robbed bit signaling and
no bit 7 zero suppression) by setting the appropriate bits in the transmit transparency registers. Channel
transparency is required in mixed voice/data or data-only environments such as ISDN, where data
integrity must be maintained.
TRANSMIT IDLE CODE INSERTION
Individual outgoing channels in the frame can be programmed with idle code by asserting the appropriate
bits in the transmit idle registers. One of two idle code formats, 7F (Hex) and FF (Hex) may be selected
by the user via TCR.3. If enabled, robbed bit signaling data is inserted into the idle channel, unless the
appropriate TTR bit is set for that channel. This feature eliminates external hardware currently required to
intercept and stuff unoccupied channels in the DS1 bit stream.
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DS2180AQN

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Manufacturer:
Maxim Integrated
Description:
Telecom Interface ICs T1 Transceiver
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