XRT86SH328_2 Datasheet, PDF (1/159 Pages) Exar Corporation – SONET TO 28-T1/21-E1 PDH MAPPER - VOYAGER PIN AND ARCHITECTURE DESC

XRT86SH328
SONET TO 28-T1/21-E1 PDH MAPPER - VOYAGER PIN AND ARCHITECTURE DESC
AUGUST 2008
REV. 1.0.1
GENERAL DESCRIPTION
The XRT86SH328 (Voyager) is a physical layer
SONET/SDH to PDH mapper/demapper which
enables T1/E1 aggregation to STS-3/STM-1 or STS1/
STM0 via standard VT1.5/VT2 or VC-11/VC-12 to
AU-3 and TUG-3/AU-4 mapping protocols. Voyager
supports all the framing, mapping and grooming
functions required for STS-3/STM-1 mapper
applications. The device generates and terminates all
SONET/SDH Regenerator Section, Multiplexer
Section and Path Overhead including the low-order
Virtual Container (VC) Path Overhead. T1/E1 framing
is transparent; therefore, the device neither
generates nor terminates the E1 frame.
A single Voyager performs mapping of 28
aysnchrounous T1 spans to VT1.5/STS-1 in SONET
or VC-11/TU-11/TUG-2/VC-3/AU-3/STM-0 in SDH.
The Voyager can also alternatively map 21
asynchronous E1 spans to VT2/STS-1 or VC-12/TU-
12/TUG-2/VC-3/AU-3/STM-0. Mapping to STS-3/
STM-1 requires (3) Voyager devices with one acting
as "master" framer and two acting as "slave" framers.
In this configuration, Voyager performs all the
necessary framing, pointer processing and mapping
functions required for mapping 84 x T1 spans to
VT1.5/STS-1/STS-3 in SONET or either VC11/TU11/
TUG-2/VC-3/AU-3/STM1 or VC-11/TU-11/TUG-2/
TUG-3/VC-4/AU-4/STM-1 in SDH. Alternatively, 63 x
E1 spans can also be map to VT2/STS-1/STS-3 in
SONET or either VC-12/TU-12/TUG-2/VC-3/AU-3/
STM-1 or VC-12/TU-12/TUG-2/TUG-3/VC-4/AU-4/
STM-1 in SDH.
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM
19. 44 Mhz
SONET OH
Drop _2kHz/8kHz
Path OH
Drop
STS- N TOH
Processor
Master
Slave
Telecom Bus or
Serial Port
Interface
Telecom
Bus
Rx
Telecom
Bus
Tx
SONET
Trans-
Port
Proc
( TOH)
Rx
SONET
Trans-
Port
Proc
( TOH)
Tx
SONET
Path
Proc
( _POH)
Rx
SONET
Path
Proc
( _POH)
Tx
STS- N TOH
Processor
M13
MUX
DS-3 Framers
XRT86SH328 Voyager
Long Haul LBO
Diagnostics
VT1.5
VT2
Mapper
+
Pointer
Proc
Rx
VT1.5
VT2
Mapper
+
Pointer
Proc
Tx
VT1.5
VT2
Cross
Connect
28x 28
21x 21
Rx
VT1.5
VT2
Cross
Connect
28x 28
21x 21
Tx
28 T1/
21 E1
Ch
Rx
Framer
28 T1/
21 E1
Ch
Tx
Framer
28 T1/
21 E1
Short
Haul
LIU
Tx
28 T1/
21 E1
Ch
Tx
Framer
28 T1/
21 E1
Ch
Rx
Framer
28 T1/
21 E1
Short
Haul
LIU
Rx
PLL
T1/E1,
2/4/8x
JTAG
Microprocessor
Egress
Ingress
Recovered
Line Clock
SONET OH
Add
Path OH
Add
Single Input
Clock
Reference
JTAG
Port
Microprocessor
Interface
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com