BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 184

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.11 Transmit LIU Registers
PULSE[2:0]
AISCLK
3-66
Select Transmit Pulse Template—Each positive or negative pulse output on XTIP/XRING is
shaped to meet the transmit pulse template according to the selected cable length and type.
(Refer to
T1/E1 isolated pulse templates.) Each time the processor writes to TLIU_CR [addr 068], the
default shape values are transferred from internal ROM into SHAPE registers [addr 060–067].
Custom shape programming for alternative cable types or pulse templates will be discussed in
a separate Bt8370/8375/8376 application note.
Enable Automatic ACKI Switching—When AISCLK is active and the clock monitor reports a
loss of transmit clock [TLOC; addr 048], the transmitter clock is automatically switched to
reference ACKI instead of TCKI, and the transmitter is forced to send AIS (all ones) data. If
both AISCLK and TAIS [addr 075] are active, AIS is transmitted using ACKI clock regardless
of the clock monitor status. Set AISCLK only if the system supplies an alternate line rate clock
on the ACKI pin.
TAIS
PULSE
Figure 2-34, TLIU Waveform
0
0
0
0
0
0
0
1
1
000
001
010
011
100
101
110
111
AUTO_AIS
Long Haul FCC Part 68
X
X
0
0
0
1
1
1
1
Inputs
ITU–T G.703
ITU–T G.703
Cable Length
133–266 Ft
266–399 Ft
399–533 Ft
533–655 Ft
0–133 Ft
AISCLK
Conexant
X
X
1
1
0
1
0
1
0
and
RLOS/RLOC
Figure 2-41, 0 dB LBO Isolated Pulse Template
75
100
100
100
100
100
120
100
Fully Integrated T1/E1 Framer and Line Interface
X
X
X
X
X
X
0
0
1
Cable Type
Coaxial Cable
Status
Twisted Pair
Twisted Pair
Twisted Pair
Twisted Pair
Twisted Pair
Twisted Pair
Twisted Pair
TLOC
X
X
X
0
0
1
0
1
1
CLOCK
TCKI
TCKI
ACKI
TCKI
TCKI
ACKI
TCKI
ACKI
TCKI
T1 CSU/NCTE
Application
Bt8370/8375/8376
Transmit
T1 DSX
T1 DSX
T1 DSX
T1 DSX
T1 DSX
E1
E1
Normal
Normal
Normal
Normal
DATA
AIS
AIS
AIS
AIS
AIS
N8370DSE
for