DS2196 Dallas Semiconducotr, DS2196 Datasheet - Page 7

• Manufacturer Part Number: DS2196
• Description: T1 Dual Framer LIU
• Manufacturer: Dallas Semiconducotr

1.2 Typical Applications
1.3 Functional Description
The analog AMI/B8ZS waveform off of the T1 line is transformer coupled into the RRING and RTIP
pins of the DS2196. The device recovers clock and data from the analog signal and passes it through the
optional jitter attenuator to the receive side framer where the digital serial stream is analyzed to locate the
framing/multiframe pattern. The DS2196 contains an active filter that reconstructs the analog received
signal for the nonlinear losses that occur in transmission. The device has a usable receive sensitivity of 0
dB to –36 dB, which allows the device to operate on cables up to 6000 feet in length. The receive side
framer locates D4 (SLC–96) or ESF multiframe boundaries as well as detects incoming alarms including,
carrier loss, loss of synchronization, blue (AIS) and yellow alarms.
The transmit side of the DS2196 is totally independent from the receive side in both the clock
requirements and characteristics. The transmit formatter will provide the necessary frame/multiframe data
overhead for T1 transmission. Once the data stream has been prepared for transmission, it is sent via the
optional jitter attenuator to the wave shaping and line driver functions. The DS2196 will drive the T1 line
from the TTIP and TRING pins via a coupling transformer. The line driver can handle both long haul
(CSU) and short haul (DSX–1) lines.
Telco
T1
Interface
T1
Interface
A
1.544 MHz
1.544 MHz
Long /
Short
Haul
Line
Interface
Unit
(LIU)
Long /
Short
Haul
Line
Interface
Unit
(LIU)
CSU APPLICATION
OFFICE REPEATER/NIU
Microcontroller
Microcontroller
Tx
Formatter A
Tx
Formatter A
Rx
Framer A
DS2196
Rx HDLC
Tx HDLC
Rx
Framer A
DS2196
Rx HDLC
Tx HDLC
Tx
Formatter B
Tx
Formatter B
Rx
Framer B
Tx HDLC
Rx HDLC
Rx
Framer B
Tx HDLC
Rx HDLC
Short
Haul
Line
Interface
Unit
(LIU)
Long /
Short
Haul
Line
Interface
Unit
(LIU)
CPE
T1
Interface
T1
Interface
B
T1
Interface
(Remote or
CO Located)
T1
Network
Interface
7 of 157
1.544 MHz
1.544 MHz
Long /
Short
Haul
Line
Interface
Unit
(LIU)
Long /
Short
Haul
Line
Interface
Unit
(LIU)
HDSL1/HDSL2 APPLICATION
T3/SONET/OPTICAL MULTIPLEXER
APPLICATION
Microcontroller
Microcontroller
Tx
Formatter A
Tx
Formatter A
Rx
Framer A
Rx
Framer A
DS2196
Rx HDLC
Tx
DS2196
Tx HDLC
Rx HDLC
Tx
Formatter B
Tx
Formatter B
Tx HDLC
Rx HDLC
Rx
Framer B
Tx HDLC
Rx HDLC
Rx
Framer B
HDSL1 /
HDSL2
Modem
T3 /
SONET /
Optical
Mux
NRZ
Interface
NRZ
Interface
One or Two
Sets of
Twisted
Pair