STANDARD PRODUCT
PM4328 TECT3
DATASHEET
PMC-2011596
ISSUE 1
HIGH DENSITY T1/E1 FRAMER
AND M13 MULTIPLEXER
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DESCRIPTION
The PM4328 High Density T1/E1 Framer with Integrated M13 Multiplexer
(TECT3) is a feature-rich device for use in any applications requiring high density
link termination over T1 or E1 channelized DS3.
The TECT3 supports asynchronous multiplexing and demultiplexing of 28 DS1s
into a DS3 signal as specified by ANSI T1.107 and Bell Communications
Research TR-TSY-000009.
This device can also be configured as a DS3 framer, providing external access to
the full DS3 payload.
The TECT3 can be used as an M13 multiplexer with performance monitoring in
either the ingress or egress direction for up to 28 T1s or 21 E1s. In this
configuration the T1 and E1 transmit framers are disabled and either the ingress
or egress T1 or E1 signals are routed to the T1 or E1 framers for performance
monitoring purposes.
Each of the T1 and E1 framers and transmitters is independently software
configurable, allowing timing master and feature selection without changes to
external wiring. This device is able to operate in T1 mode or E1 mode but not a
mix of T1 and E1 modes.
In the ingress direction, each of the 28 T1 framers is demultiplexed from a
channelized DS3 . Each T1 framer can be configured to frame to either of the
common DS1 signal formats: (SF, ESF) or to be bypassed (unframed mode).
Each T1 framer detects and indicates the presence of Yellow and AIS patterns
and also integrates Yellow, Red, and AIS alarms.
T1 performance monitoring with accumulation of CRC-6 errors, framing bit
errors, out-of-frame events, and changes of frame alignment is provided. The
TECT3 also detects the presence of ESF bit oriented codes, and detects and
terminates HDLC messages on the ESF data link. The HDLC messages are
terminated in a 128 byte FIFO. An elastic store that optionally supports slip
buffering and adaptation to backplane timing is provided, as is a signaling
extractor that supports signaling debounce, signaling freezing and interrupt on
signaling state change on a per-DS0 basis. The TECT3 also supports idle code
substitution, digital milliwatt code insertion, data extraction, trunk conditioning,
data sign and magnitude inversion, and pattern generation or detection on a per-
DS0 basis.
In the egress direction, framing is generated for 28 T1s into the DS3. Each T1
transmitter frames to SF or ESF DS1 formats, or framing can be optionally
PROPRIETARY AND CONFIDENTIAL
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PMC [ PMC-SIERRA, INC ]
