CN8380 Datasheet, PDF (65/91 Pages) Conexant Systems, Inc – integrated quad line interface unit unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications

CN8380
Quad T1/E1 Line Interface
3.0 Registers
3.3 Per Channel Registers
PULSE[2:0]
Transmit Pulse Template Select—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.
Custom shape programming for alternative cable types or pulse templates can be set using the
SHAPE0–SHAPE7 registers [addr n8 – nF].
PULSE
000
001
010
011
100
101
110
111
Cable Length
0–133 ft.
133–266 ft.
266–399 ft.
399–533 ft.
533–655 ft.
ITU–T G.703
ITU–T G.703
I.431 ISDN
Cable Type
100 Ω Twisted Pair
100 Ω Twisted Pair
100 Ω Twisted Pair
100 Ω Twisted Pair
100 Ω Twisted Pair
75 Ω Coaxial Cable
120 Ω Twisted Pair
100 Ω Twisted Pair
Application
T1 DSX
T1 DSX
T1 DSX
T1 DSX
T1 DSX
E1
E1
T1 CSU/NCTE
13, 23, 33, 43—LIU Control (LIU_CTL)
7
6
5
AISCLK
AUTO_AIS
TAIS
4
LLOOP
3
RLOOP
2
TAIS_PE
1
LLOOP_PE
R/W
0
RLOOP_PE
AISCLK
AUTO_AIS
TAIS
Enable Automatic ACKI Switching—If AISCLK is active, the transmitter clock is
automatically switched to reference TACKI (T1) or EACKI (E1) instead of TCLK when
transmitting AIS (all 1s) data. Set AISCLK only if the system supplies an alternate line rate
clock on the TACKI or EACKI pins. Also refer to description of AUTO_AIS/TAIS below.
0 = TACKI/EACKI is not used to transmit AIS
1 = TACKI/EACKI is used to transmit AIS
Automatic Transmit Alarm Indication Signal
Manual Transmit Alarm Indication Signal—When activated manually (TAIS) or automatically
(AUTO_AIS), the AIS generator replaces all data output on XTIP/XRING with an unframed
all-1s signal (AIS). This includes replacing data supplied from TPOSI/TNEGI and from the
receiver during Remote Line Loopback. Automatic mode sends AIS for the duration of
transmit loss of clock [TLOC; addr n5]. If AISCLK is enabled, the transmit clock is switched
to use TACKI or EACKI to transmit AIS.
N8380DSA
Conexant
3-13
4/21/99
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