WJLXT384LE.B1-868635 Cortina Systems Inc, WJLXT384LE.B1-868635 Datasheet - Page 12

• Manufacturer Part Number: WJLXT384LE.B1-868635
• Manufacturer: Cortina Systems Inc

Specifications of WJLXT384LE.B1-868635

• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

LXT384 Transceiver
Datasheet
248994, Revision 6.0
30 January 2008
2.0
Cortina Systems
Product Summary
The LXT384 Transceiver is designed for use in 1.544 MBps (T1) or 2.048-Mbps (E1)
applications. It incorporates eight independent receivers and eight independent transmitters
in either a single 144-pin LQFP or a 160-ball PBGA package.
Transmitters. The LXT384 Transceiver transmits shaped waveforms that meet ITU G.703
specifications. The transmit drivers provide low impedance, independent of supply-voltage
variation and transmit patterns. The output of the transmitters is stable over a variety of
loads. The transmit return loss for the LXT384 Transceiver exceeds typical specifications
such as ETSI ETS 300 166. All transmitters have a power-down mode with the capability for
a fast transition to an output high-impedance tristate.
Power Savings. The transmit output design allows you to use the transmitter output of the
LXT384 Transceiver in a broad range of applications, while maintaining circuit stability. As a
result, the LXT384 Transceiver can offer a low-current transmit output option that can
reduce power dissipation by up to 15%. By changing the LXT384 Transceiver output
transformer ratio from 1:2 to 1:1.7, the savings occur whether TVCC is at 5 V or 3.3 V.
Receivers. The LXT384 Transceiver has a differential receiver architecture that provides a
high noise-interference margin so that the receivers can operate well beyond 12 dB of cable
attenuation.
Jitter Attenuation. The LXT384 Transceiver incorporates a crystal-less jitter attenuator
that can be switched to work inside either the receive or the transmit path, or it can be
disabled entirely. The jitter-attenuation performance, optimized for synchronous digital
hierarchy (SDH) applications, meets typical international specifications such as ETSI
CTR12/13.
Performance Monitoring. You can configure the LXT384 Transceiver for non-intrusive
performance monitoring (also known as ‘protected monitoring’) that is compliant with ITU
G.772.
Hitless Protection Switching. The LXT384 Transceiver can operate in a Hitless Protection
Switching mode, which uses one transceiver to back up another, in case the primary
transceiver fails. This method is often referred to as 1+1 redundancy protection. Typical
redundancy methods used external relays. Hitless Protection Switching is a solid-state
solution, which reduces bit errors that can occur when using external relays for redundancy
protection. This mode uses two LXT384 Transceivers in parallel, with one
LXT384 Transceiver powered on, while the other LXT384 Transceiver is in standby mode.
As a result, one LXT384 Transceiver backs up another LXT384 Transceiver. See the 1+1
Protection without Relays Using Cortina Systems
Switching - Application Note.
®
LXT384 Octal T1/E1/J1 Short-Haul PCM Transceiver with Jitter Attenuation (JA)
®
LXT380/1/4/6/8 Hitless Protection
TM
TM
2.0 Product Summary
Page 12