XRT86SH328_1 Datasheet, PDF (1/129 Pages) Exar Corporation – VOYAGER - E1 FRAMER + LIU REGISTER DESCRIPTION

XRT86SH328
VOYAGER - E1 FRAMER + LIU REGISTER DESCRIPTION
AUGUST 2008
REV. 1.0.1
GENERAL DESCRIPTION
The XRT86SH328 has a total of 42 independent E1
framers (or 56 independent framers for T1). This
Voyager Device maps 21 E1 payloads up to STS-3/
STM-1. The purpose of the 42 framers is to allow
back-to-back transmit and receive framers on each of
the 21 channel Egress and Ingress data paths. The
channel numbering system references the framers
according to the block diagram shown in Figure 1,
where every 4^TH Channel is not used in E1 mode.
The XRT86SH328 provides E1 framing and error
accumulation in accordance with ANSI/ITU_T
specifications. Each framer has its own framing
synchronizer and transmit-receive slip buffers. The
slip buffers can be independently enabled or disabled
as required and can be configured to frame to the
common E1 signal formats.
Each Framer block contains its own Transmit and
Receive E1 Framing function. There is 1 Transmit
HDLC controller per channel which encapsulates
contents of the Transmit HDLC buffers into LAPD
Message frames. There is 1 Receive HDLC controller
per channel which extracts the payload content of
Receive LAPD Message frames from the incoming
E1 data stream and write the contents into the
Receive HDLC buffers.
The XRT86SH328 fully meets all of the latest E1
specifications: ANSI E1.107-1988, ANSI E1.403-
1995, ANSI E1.231-1993, ANSI E1.408-1990, AT&T
TR 62411 (12-90) TR54016, and ITU G-703, G.704,
G706 and G.733, AT&T Pub. 43801, and ETS 300
011, 300 233, JT G.703, JT G.704, JT G706, I.431.
Extensive test and diagnostic functions include Loop-
backs, Boundary scan, Pseudo Random bit
sequence (PRBS) test pattern generation,
Performance Monitor, Bit Error Rate (BER) meter,
forced error insertion, and LAPD unchannelized data
payload processing according to ITU-T standard
Q.921.
Applications and Features (next page)
FIGURE 1. XRT86SH328 21-CHANNEL E1 FRAMERS (42 TOTAL E1 FRAMERS)
VT
Mapper
Cross
Connect
E1 Framers
Ch 0
Ch 28
Rx
Tx
Tx
Rx
Rx
Tx
Tx
Rx
Rx
Tx
Tx
Rx
Rx
Tx
Tx
Rx
Every 4^th Channel
Is Not Used in E1 Mode
LIU
Ch 27
Rx
Tx
Ch 55
Tx
Rx
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com