PRELIMINARY
DATASHEET
PMC- 2001578
ISSUE 3
PM4318 OCTLIU
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
1.1 Each Receiver Section:
• Supports T1 signal reception for distances with up to 36 dB of cable attenuation at nominal conditions
using PIC 22 gauge cable emulation.
• Supports E1 signal reception for distances with up to 36 dB of cable attenuation at nominal conditions
using PIC 22 gauge cable emulation.
• Supports G.772 compliant non-intrusive protected monitoring points.
• Recovers clock and data using a digital phase locked loop for high jitter tolerance.
• Tolerates more than 0.3 UI peak-to-peak; high frequency jitter as required by AT&T TR 62411 and
Bellcore TR-TSY-000170.
• Outputs either dual rail recovered line pulses, a single rail DS-1/E1 signal or parallel data in SBI bus
format.
• Performs B8ZS or AMI decoding when processing a bipolar DS-1 signal and HDB3 or AMI decoding
when processing a bipolar E1 signal.
• Detects line code violations (LCVs), B8ZS/HDB3 line code signatures, and 4 (E1+HDB3), 8
(T1+B8ZS) or 16 (AMI) successive zeros.
• Accumulates up to 8191 line code violations (LCVs), for performance monitoring purposes, over
accumulation intervals defined by the period between software write accesses to the LCV register.
• Detects loss of signal (LOS), which is defined as 10, 15, 31, 63, or 175 successive zeros.
• Detects programmable inband loopback activate and deactivate code sequences received in the DS-
1 data stream when they are present for 5.1 seconds. Optionally, enters loopback mode
automatically on detection of an inband loopback code.
• Detects violations of the ANSI T1.403 12.5% pulse density rule over a moving 192-bit window.
• A pseudo-random sequence user selectable from 211 –1, 215 –1 or 220 –1, may be detected in the
T1/E1 stream in either the receive or transmit directions. The detector counts pattern errors using a
24-bit saturating PRBS error counter.
1.2 Each Transmitter Section:
• Supports transfer of transmitted single rail PCM and signaling data from 1.544 Mbit/s and 2.048
Mbit/s backplane buses.
• Generates DSX-1 shorthaul and DS-1 longhaul pulses with programmable pulse shape compatible
with AT&T, ANSI and ITU requirements.
• Generates E1 pulses compliant to G.703 recommendations.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
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