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DS2290 Datasheet

T1 Isolation Stik

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DS2290
DS2290
T1 Isolation Stik
FEATURES
Protected interface for connecting equipment to T1
lines
Provides 800 volts of surge protection and 1500 volts
of isolation
FCC Part 68 registered
Meets TR 62411 and T1.403–1989 for transmit pulse
characteristics
Line build outs of 0, –7.5, and –15 dB
Companion to the DS2291 T1 Long Loop Stik
Connects to a standard 30–pin single in–line connec-
tor
Single +5V supply
Compatible with the DS2180A and DS2141A T1
Tranceivers
PIN ASSIGNMENT
VDD
VDD
LCLK
LPOS
LNEG
TCLK
TPOS
TNEG
LB
NC
LB2
LB1
LB0
TAIS
B8ZS
NC
NC
NC
RX+
RX–
NC
GND
GND
NC
RXTIP
LPWR+
RXRING
TXTIP
LPWR–
TXRING
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
(ACTUAL SIZE)
DESCRIPTION
The DS2290 T1 Isolation Stik provides all the surge and
isolation protection that is necessary to connect a piece
of equipment to a T1 line. It offers a function similar to
that provided by a Data Access Arrangement (DAA)
when a modem is connected to a phone line. The
DS2290 is FCC Part 68 pre–registered so the user can
connect equipment to T1 lines without any further test-
ing or qualification. It contains onboard waveshaping
circuitry that creates transmit pulses meeting the latest
T1 specifications including TR 62411 (Accunet* T1.5
Service Description and Interface Specifications, – De-
cember 1990) and T1.403–1989 (Carrier to Carrier In-
stallation – DS1 Metallic Interface). Applications in-
clude Channel Service Units and similar equipment that
requires a fully protected interface.
* Service mark of AT&T Communications
022798 1/9




Dallas Semiconductor

DS2290 Datasheet Preview

DS2290 Datasheet

T1 Isolation Stik

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DS2290
OVERVIEW
The DS2290 contains all the isolation and surge protec-
tion required to connect equipment to T1 lines. The Iso-
lation Stik has a receive and a transmit section. (See
Figure 1.) In the receive section, inputs RXTIP and
RXRING are connected directly to the receive T1
twisted pair. These inputs are terminated at 100 ohms.
The T1 signal received at RXTIP and RXRING is
coupled through a 2:1 transformer and presented at the
RX+ and RX– outputs. See Figure 2. There is a full
1500 volts of isolation between the Network Side pins
and the Customer Side pins.
In the transmit section, data that is to be transmitted is
sourced from either the TPOS and TNEG inputs or the
LPOS and LNEG inputs. The Data Mux will transmit
data at the TCLK rate from the TPOS and TNEG inputs if
the LB pin is either tied low or left open. It will transmit
data at the LCLK rate from the LPOS and LNEG inputs if
the LB pin is tied high. In order to comply with the latest
T1 standards, the clock presented at either TCLK or
LCLK must be at a 1.544 MHz rate (±32 ppm) and must
not jitter beyond 0.05 unit intervals peak–to–peak
(UIpp). TPOS and TNEG can be tied together if the
source of the transmit data is in a NRZ format. The
DS2290 will automatically sense that these inputs are
tied together and will create a bipolar data stream from
them. The same holds true for the LPOS and LNEG in-
puts.
Data out of the Data Mux is passed to a B8ZS encoder
and AIS generator. If the B8ZS pin is tied high, then the
DS2290 will properly encode the transmit data stream
for the B8ZS zero code suppression scheme. If the
B8ZS pin is tied low or left open, the DS2290 will not en-
code the transmit data for B8ZS. Also, the DS2290 can
be configured to transmit an AIS (Alarm Indication Sig-
nal). If the TAIS pin is tied high, the DS2290 will transmit
an unframed, all ones signal at either the TCLK (LB=0 )
or LCLK (LB=1) rate.
The data to be transmitted is fed to the line driver. The
line driver creates the T1 pulse that will be transmitted.
The line build out pins LB0 to LB2 select whether the
output pulse level will be 0, –7.5, or –15 dB (see Table
3). If 0 dB of build out is selected, the output pulse will
conform to the shape described in Figure 2. This pulse
shape is congruent with the latest T1 specifications
such as TR 62411 and T1.403–1989. If the –7.5 dB or
–15 dB line build outs are selected, then the pulse
shown in Figure 3 will be attenuated according to the
transfer function as described in FCC Part 68, Subpart
D. Once the T1 pulse has been created, it is then trans-
mitted onto the transmit T1 twisted pair via the TTIP and
TRING outputs.
The DS2290 contains provisions for line powering. If
the DS2290 is to be powered from the T1 line using a DC
simplex power arrangement, then an external DC–to–
DC converter can connected to the LPWR+ and LPWR–
pins. Requirements for line powering are currently be-
ing relaxed and will be totally removed in the future. If
the DS2290 is not line powered, the LPWR+ and
LPWR– pins should be tied together.
Figure 4 shows a typical application using the DS2290.
The transmit and receive T1 twisted pairs are connected
directly to the DS2290. The DS2291 T1 Long Loop Stik
recovers clock and data from the protected signal pro-
vided by the Isolation Stik. The DS2180A T1 Transceiv-
er frames to the recovered data and interfaces to the
system backplane. The DS2250 Soft Microcontroller
Stik is used to control and monitor the status of the other
devices.
022798 2/9


Part Number DS2290
Description T1 Isolation Stik
Maker Dallas Semiconductor
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DS2290 Datasheet PDF






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