IDT82P5088BBG IDT, Integrated Device Technology Inc, IDT82P5088BBG Datasheet - Page 25

• Manufacturer Part Number: IDT82P5088BBG
• Description: IC LIU T1/E1/J1 OCTAL 256PBGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT82P5088BBG

• Includes: Integrated Clock Adapter
• Function: Line Interface Unit (LIU)
• Interface: E1, J1, T1
• Number Of Circuits: 8
• Voltage - Supply: 1.8V, 3.3V
• Power (watts): 2.57W
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 256-BBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

3.3.2
ing on channels located in other chips can be performed by tapping the mon-
itored channel through a high impedance bridging circuit. Refer to
10
RRINGn is dramatically attenuated. To compensate this attenuation, the
Monitor Gain can be used to boost the signal by 22 dB, 26 dB and 32 dB,
selected by MG[1:0] bits (RCF2, 2AH...). For normal operation, the Monitor
Gain should be set to 0 dB.
3.3.3
intersymbol interference caused by cable attenuation. It can be enabled or
disabled by setting EQ_ON bit to ‘1’ or ‘0’ (RCF1, 29H...).
tude/wave shape of the incoming signals during an observation period. This
observation period can be 32, 64, 128 or 256 symbol periods, as selected
by UPDW[1:0] bits (RCF2, 2AH...). A shorter observation period allows
quicker response to pulse amplitude variation while a longer observation
period can minimize the possible overshoots. The default observation
period is 128 symbol periods.
FUNCTIONAL DESCRIPTION
IDT82P5088
Figure-10 Monitoring Receive Line in Another Chip
and Figure-11.
In both T1/J1 and E1 short haul applications, the non-intrusive monitor-
After a high resistance bridging circuit, the signal arriving at the RTIPn/
The adaptive equalizer can remove most of the signal distortion due to
The Amplitude/wave shape detector keeps on measuring the ampli-
Figure-11 Monitor Transmit Line in Another Chip
LINE MONITOR
ADAPTIVE EQUALIZER
DSX cross connect
DSX cross connect
point
point
R
R
TTIP
RTIP
TRING
RRING
RRING
RRING
RTIP
RTIP
=22/26/32dB
monitor gain
monitor gain
normal transmit mode
normal receive mode
monitor mode
gain=0dB
=22/26/32dB
monitor gain
monitor
monitor mode
UNIVERSAL OCTAL T1/E1/J1 LIU WITH INTEGRATED CLOCK ADAPTER
Figure-
25
adjusted to achieve a normalized signal. LATT[4:0] bits (STAT1, 37H...)
indicate the signal attenuation introduced by the cable in approximately 2
dB per step.
3.3.4
J1 is -10 dB. For long haul application, the receive sensitivity is -43 dB for
E1 and -36 dB for T1/J1.
3.3.5
space according to the amplitude of the input signals. The threshold can
be 40%, 50%, 60% or 70%, as selected by the SLICE[1:0] bits (RCF2,
2AH...). The output of the Data Slicer is forwarded to the CDR (Clock & Data
Recovery) unit or to the RDPn/RDNn pins directly if the CDR is disabled.
3.3.6
recovered clock tracks the jitter in the data output from the Data Slicer and
keeps the phase relationship between data and clock during the absence
of the incoming pulse. The CDR can also be by-passed in the Dual Rail
mode. When CDR is by-passed, the data from the Data Slicer is output to
the RDPn/RDNn pins directly.
3.3.7
select the AMI decoder or B8ZS decoder. In E1 applications, the R_MD[1:0]
bits (RCF0, 28H...) are used to select the AMI decoder or HDB3 decoder.
3.3.8
pin and RDNn pin. In E1 mode, the RCLKn outputs a recovered 2.048 MHz
clock. In T1/J1 mode, the RCLKn outputs a recovered 1.544 MHz clock. The
received data is updated on the RDn/RDPn and RDNn pins on the active
edge of RCLKn. The active edge of RCLKn can be selected by the
RCLK_SEL bit (RCF0, 28H...). And the active level of the data on RDn/
RDPn and RDNn can also be selected by the RD_INV bit (RCF0, 28H...).
Single Rail or Dual Rail, as selected by R_MD bit [1] (RCF0,28H...). In Single
Rail mode, only RDn pin is used to output data and the RDNn/CVn pin is
used to report the received errors. In Dual Rail Mode, both RDPn pin and
RDNn pin are used for outputting data.
R_MD[1:0] to ‘11’ (binary). In this situation, the output data from the Data
Slicer will be output to the RDPn/RDNn pins directly, and the RCLKn out-
puts the exclusive OR (XOR) of the RDPn and RDNn.
3.3.9
bit (RCF0, 28H...) to ‘1’. In this case, the RCLKn, RDn/RDPn, RDPn and
LOSn will be logic low.
Based on the observed peak value for a period, the equalizer will be
For short haul application, the Receive Sensitivity for both E1 and T1/
The Data Slicer is used to generate a standard amplitude mark or a
The CDR is used to recover the clock from the received signals. The
In T1/J1 applications, the R_MD[1:0] bits (RCF0, 28H...) is used to
The receive path system interface consists of RCLKn pin, RDn/RDPn
The received data can be output to the system side in two different ways:
In the receive Dual Rail mode, the CDR unit can be by-passed by setting
The receive path can be powered down individually by setting R_OFF
RECEIVE SENSITIVITY
DATA SLICER
CDR (Clock & Data Recovery)
DECODER
RECEIVE PATH SYSTEM INTERFACE
RECEIVE PATH POWER DOWN
February 5, 2009