
STANDARD PRODUCT
PM8315 TEMUX
DATASHEET
PMC-1981125
ISSUE 7
HIGH DENSITY T1/E1 FRAMER  WITH
INTEGRATED VT/TU MAPPER AND M13 MUX
PROPRIETARY AND CONFIDENTIAL
26
6 
DESCRIPTION
The PM8315 High Density T1/E1 Framer with Integrated VT/TU Mapper and
M13 Multiplexer (TEMUX) is a feature-rich device for use in any applications
requiring high density link termination over T1 channelized DS3 or T1 and E1
channelized SONET/SDH facilities.
The TEMUX 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.  It supports bit asynchronous mapping and
demapping of 28 T1s or 21 E1s into SONET/SDH as specified by ANSI T1.105,
Bell Communications Research GR-253-CORE and ITU-T Recommendation
G.707. The TEMUX also supports mapping of 21 T1s into SDH via TU-12s. Up to
28 Transparent VT1.5s and TU-11s or 21 Transparent VT2s and TU-12s can be
transferred between the SONET/SDH interface and the SBI bus interface.
This device can also be configured as a DS3 framer, providing external access to
the full DS3 payload, or a VT/TU mapper, providing access to unframed
1.544Mb/s and 2.048Mb/s links.
The TEMUX can be used as a SONET/SDH VT/TU mapper or 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 either demultiplexed  from a
channelized DS3 or extracted from SONET VT1.5, TU-11 or TU-12 mapped bus.
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
TEMUX 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