Rainbow Electronics DS2186 - Manual

E Copyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
DS2186
Transmit Line Interface
DS2186
041295 1/11
FEATURES
•
Line interface for T1 (1.544 MHz) and CEPT (2.048
MHz) primary rate networks
•
On–chip transmit LBO (line build out) and line drivers
eliminate external components
•
Programmable output pulse shape supports short–
and long–loop applications
•
Supports bipolar and unipolar input data formats
•
Transparent B8ZS and HDB3 zero code suppression
modes
•
Compatible with DS2180A T1 and DS2181A CEPT
Transceivers DS2141A T1 and DS2143 E1 Control-
lers
•
Companion to the DS2187 Receive Line Interface
and DS2188 T1/CEPT Jitter Attenuator
•
Single 5V supply; low–power CMOS technology
PIN ASSIGNMENT
LF
V DD
V SS LF
20-Pin DIP (300 MIL)
TAIS
ZCSEN
TCLKSEL
LEN0
LEN1
LEN2
TTIP
TRING
LCLK
LPOS
LNEG
TCLK
TPOS
TNEG
LB
MTIP
MRING
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
ZCSEN
20-Pin SOIC (300 Mil)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
LCLK
LPOS
LNEG
TCLK
TPOS
TNEG
LB
MTIP
MRING
TAIS
TCLKSEL
LEN0
LEN1
LEN2
VDD
TTIP
TRING
VSS
DESCRIPTION
The DS2186 T1/CEPT Transmit Line Interface Chip in-
terfaces user equipment to North American (T1–1.544
MHz) and European (CEPT–2.048 MHz) primary rate
communications networks. The device is compatible
with all types of twisted pair and coax cable found in
such networks.
Key on–chip components include: programmable wave
shaping circuitry, line drivers, remote loopback, and
zero suppression logic. A line–coupling transformer is
the only external component required.
Short loop (DSX–1, 0 to 655 feet) and long loop (CSU; 0
dB, –7.5 dB and –15 dB) pulse templates found in T1
applications are supported. Appropriate CCITT recom-
mendations are met in the CEPT mode.
Application areas include DACS, CSU, CPE, channel
banks, and PABX–to–computer interfaces such as DMI
and CPI. The DS2186 supports ISDN–PRI (Primary
Rate Interface) specifications.