PMC-960615 (R6)
©
Ã
1998 PMC-Sierra, Inc. October, 1998
PM4388
PMC-Sierra,Inc.
Octal T1 Framer
TOCTL
FEATURES
· Monolithic single-chip device that
integrates eight datacom T1 framers
and transmitters for terminating duplex
DS1 signals.
· Supports DS1 signals in SF, ESF, or
unframed modes.
· Provides ESF bit-oriented code
detection/generation, and an HDLC
interface for terminating/generating the
ESF datalink.
· Supports transfer of PCM data to/from
1.544 Mbit/s or 2.048 Mbit/s backplane
buses. Supports fractional T1
backplane interface with asymmetric
transmit/receive
n
×
DS0 rates.
· Supports robbed-bit signaling
extraction and insertion on a per-DS0
basis.
· Provides programmable idle code
substitution and data inversion on a
per-channel basis.
· Provides per-DS0 line loopback and
per-link diagnostic and line loopbacks.
· Provides trunk conditioning which
forces programmable trouble code
substitution on all/selected channels.
· Supports a Pseudo Random Binary
Sequence (PRBS) generator and
detector which may be configured for
insertion/detection on a
n
×
DS0 basis.
· Supports a 1-second polling interval for
access to T1 performance monitoring
and HDLC datalinks.
· Pin-compatible to the PM6388 EOCTL
Octal E1 Framer.
· Software-compatible with the
PM4341A T1XC Single T1
Transceiver, the PM4344 TQUAD
Quad T1 Framer, the PM6388 EOCTL
Octal E1 Framer and the PM4351
COMET Single T1/E1 Transceiver.
· Seamless interface to the PM7364
FREEDM-32 HDLC controller, the
PM7366 FREEDM-8 HDLC controller,
the PM8313 D3MX single-chip M13
multiplexer, and the PM4314 QDSX
quad line interface unit.
· Provides an 8-bit microprocessor bus
interface for configuration, control, and
status monitoring.
· Low power 3.3V CMOS technology
with 5 V tolerant inputs.
· Supports standard 5-signal P1149.1
JTAG boundary scan.
· Available in a rectangular 128-pin
PQFP 14 by 20 mm package.
RECEIVE SECTION
· Accepts gapped data streams to
support higher rate demultiplexing.
· Provides red, yellow, and Alarm
Indication Signal (AIS) alarm detection.
· Supports Line and Path performance
monitoring according to AT&T and
ANSI specifications. Accumulators are
provided for counting ESF CRC-6
errors, Framing bit errors and Loss Of
Frame (LOF) or change of frame
alignment events.
· Extracts the ESF datalink, provides
128 bytes of FIFO buffering per
datalink.
· Provides a 2-frame buffer for jitter and
wander attenuation.
TRANSMIT SECTION
· Provides per-channel minimum ones
density through Bell (bit 7), GTE, DDS,
or "jammed bit 8" (56 Kbit/s) zero code
suppression.
· Allows insertion of framed or unframed
in-band line loopback and per-channel
loopback code sequences.
· Allows insertion of a datalink in ESF
mode via the microprocessor port.
Provides 128 bytes of datalink
message storage per datalink.
· Supports transmission of the AIS or
the yellow alarm signal in both SF and
ESF formats.
· Provides a digital PLL for generation of
a low jitter transmit clock.
· Provides a FIFO buffer for jitter
attenuation and transmit rate
conversion. FIFO full or empty
indication allows for bit-stuffing in
higher rate multiplexing applications.
APPLICATIONS
· High-Density Internet T1 Interfaces for
Multiplexers, Switches, Routers, and
Digital Modems
· Frame Relay Switches and Access
Devices (FRADS)
· T1 Performance Monitoring
· SONET/SDH Add/Drop Multiplexers
(ADMs)
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