XRT86SH221 Datasheet, PDF (1/353 Pages) Exar Corporation – SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU

PRELIMINARY
XRT86SH221
SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU
MAY 2007
REV. P1.0.5
GENERAL DESCRIPTION
The XRT86SH221 (Voyager-Lite) is a physical layer
SDH to PDH mapper/demapper which enables E1
aggregation to STM-1 via standard VC-12 to AU-3
and TUG-3/AU-4 mapping protocols. Voyager-Lite
supports all the framing, mapping and grooming
functions required for STM-1 mapper applications.
The device generates and terminates all SDH
Regenerator Section, Multiplexer Section and Path
Overhead including the low-order Virtual Container
(VC) Path Overhead. E1 framing is transparent;
therefore, the device neither generates nor
terminates the E1 frame.
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM
A single Voyager-Lite performs mapping of 21
asynchronous E1 spans to either VC-12/TU-12/TUG-
2/ VC-3/AU-3/STM-0 or VC-12/TU-12/TUG-2/TUG-3/
STM-0. Mapping to STM-1 requires (3) Voyager-Lite
devices with one acting as "master" framer and two
acting as "slave" framers. In this configuration,
Voyager-Lite performs all the necessary framing,
pointer processing and mapping functions required
for mapping of 63xE1 spans to 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 as shown in the block
diagram.
19.44Mhz
SDH OH
Drop
8kHz
VC-4 POH
Drop
STM-1 SOH
Processor
Master
Slave
Telecom Bus or
Serial Port
Interface
Telecom
Bus
Rx
SDH
Trans-
Port
Proc
(SOH)
Rx
Telecom
Bus
Tx
SDH
Trans-
Port
Proc
(SOH)
Tx
SDH
Path
Proc
(POH)
TU-12
To
TUG2
Rx
VC3/
AU3
TUG3/
VC4/
AU4
Tx
STM-1 SOH
Processor
XRT86SH221 Voyager Lite
VC-12
Mapper
+
TU-12
Pointer
Proc
Rx
VC-12
Cross
Connect
21x21
Rx
VC-12
Mapper
+
TU-12
Pointer
Proc
Tx
VC-12
Cross
Connect
21x21
Tx
21 Ch
E1
Frame
Sync
Bit
Retimer
21 Ch
E1
Short
Haul
LIU
Tx
21 Ch
E1
Short
Haul
LIU
Rx
PLL
E1, 2xE1
4xE1, 8xE1
JTAG
Microprocessor
Egress
Ingress
Recovered
Line Clock
SDH OH
Add
VC-4 P OHSingle ^Input
Add
Clock
Reference
JTAG
Port
Microprocessor
Interface
PRODUCT NUMBER
XRT86SH221IB
PACKAGE ORDERING INFORMATION
PACKAGE TYPE
388 PBGA
OPERATING TEMPERATURE RANGE
-40°C to +85°C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com