STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
• Provides an integral pattern generator that may be programmed to generate
common pseudo-random or repetitive sequences towards the backplane.
• Provides tristateable single-rail PCM and signaling data outputs for
1.544 Mbit/s, 2.048 Mbit/s, 4.096 Mbit/s or 8.192 Mbit/s backplane buses.
1.2
Transmitter section:
• Supports transfer of transmitted single rail PCM and signaling data from
1.544 Mbit/s, 2.048 Mbit/s, 4.096 Mbit/s or 8.192 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.
• Provides a digitally programmable pulse shape extending up to 5 transmitted
bit periods for custom long haul pulse shaping applications.
• Provides line outputs which are current limited and may be tristated for
protection or in redundant applications.
• Provides an alternative digital interface for external line interface units.
• Provides a digital phase locked loop for generation of a low jitter transmit
clock complying with all jitter attenuation, jitter transfer and residual jitter
specifications of AT&T TR 62411 and ETSI TBR 12 and TBR 13.
• Provides a FIFO buffer for jitter attenuation and rate conversion in the
transmit path.
• Provides a two-frame payload slip buffer to allow independent backplane and
line timing.
• Provides an integral pattern generator that may be programmed to generate
common pseudo-random or repetitive sequences. The programmed
sequence may be inserted in the entire frame, or on an NxDS0 basis.
• Provides an integral pattern detector that may be programmed to detect
common pseudo-random or repetitive sequences from the backplane.
• Transmits G.704 basic and CRC-4 multiframe formatted E1 signals or D4, SF
or ESF formatted DSX/DS-1 signals.
PROPRIETARY AND CONFIDENTIAL
4
PMC [ PMC-SIERRA, INC ]
