DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 136

• Manufacturer Part Number: DS3170
• Description: Network Controller & Processor ICs DS3-E3 Single-Chip T ransceiver T3-E3 Fra
• Manufacturer: Maxim Integrated Products

Bit 13: Receive LIU Monitor Mode (RMON) This bit is used to enable the receive LIU monitor mode pre-amplifier.
Enabling the pre-amplifier adds about 20 dB of linear amplification for use in monitor applications where the signal
has been reduced 20 dB using resistive attenuator circuits.
Bit 12: Transmit LIU LBO (TLBO) This bit is used enable the transmit LBO circuit which causes the transmit
signal to have a wave shape that approximates about 225 feet of cable. This is used to reduce near end crosstalk
when the cable lengths are short. This signal is only valid in DS3 LIU mode.
Bits 10 to 8 : Port Interface Mode (LM[2:0]). The LM[2:0] bits select main port interface operational modes. The
default state disables the LIU and the JA.
Table 10-26. Line Mode Select Bits LM[2:0]
LINE.TCR.TZSD &
LINE.RCR
Bits 5 to 3: Framing mode (FM[2:0]). The FM[2:0] bits select main framing operational modes. Default: DS3 C-
bit.
FM[2:0]
0 00
0 01
0 10
0 11
1 00
1 01
1 10
1 11
0 = TXP and TXN driven
1 = TXP and TXN tri-stated
0 = Disable the 20 dB pre-amp
1 = Enable the 20 dB pre-amp
0 = TXP and TXN have full amplitude signals
1 = TXP and TXN signals approximate 225 feet of cable
X
0
0
0
0
1
1
1
1
.RZSD
DS3 C-bit Framed
DS3 M23 Framed
E3 G.751 Famed
E3 G.832 Framed
DS3 Unframed
Undefined
E3 Unframed
Undefined
LM[2:0]
(
PORT.CR2
DESCRIPTION
1XX
000
001
010
011
000
001
010
011
)
Line Code
B3ZS/HDB3
B3ZS/HDB3
B3ZS/HDB3
B3ZS/HDB3
AMI
AMI
AMI
AMI
UNI
136 of 230
B3ZS/AMI/UNI
B3ZS/AMI/UNI
HDB3/AMI/UNI
HDB3/AMI/UNI
B3ZS/AMI/UNI
---
HDB3/AMI/UNI
---
LINE CODE
OFF
OFF
OFF
LIU
ON
ON
ON
ON
ON
ON
DS3170 DS3/E3 Single-Chip Transceiver
Figure 7-1
Figure 7-1
Figure 7-1
Figure 7-1
Figure 7-2
Figure 7-2
OFF
OFF
OFF
OFF
OFF
RX
RX
JA
TX
TX
FIGURE