XRT86VL38
OCTAL T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION
JANUARY 2007
REV.V1.2.0
payload content of Receive LAPD Message frames
from the incoming E1/J1 data stream and write the
contents into the Receive HDLC buffers. Each framer
also contains a Transmit and Overhead Data Input
port, which permits Data Link Terminal Equipment
direct access to the outbound E1/J1 frames.
Likewise, a Receive Overhead output data port
permits Data Link Terminal Equipment direct access
to the Data Link bits of the inbound E1/J1 frames.
GENERAL DESCRIPTION
The XRT86VL38 is an eight-channel 1.544 Mbit/s or
2.048 Mbit/s DS1/E1/J1 framer and LIU integrated
3
solution featuring
R
technology (Relayless,
Reconfigurable, Redundancy). The physical interface
is optimized with internal impedance, and with the
patented pad structure, the XRT86VL38 provides
protection from power failures and hot swapping.
The XRT86VL38 fully meets all of the latest E1/J1
The XRT86VL38 contains an integrated DS1/E1/J1
framer and LIU which provide DS1/E1/J1 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 DS1/E1/J1 signal formats.
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,
Each Framer block contains its own Transmit and
Receive E1/J1 Framing function. There are 3
Transmit HDLC controllers per channel which
encapsulate contents of the Transmit HDLC buffers
into LAPD Message frames. There are 3 Receive
HDLC controllers per channel which extract the
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. XRT86VL38 8-CHANNEL DS1 (E1/J1) FRAMER/LIU COMBO
External Data
Link Controller
Local PCM
Tx Overhead In
Rx Overhead Out
Highway
XRT86VL38
1 of 8-channels
1:2 Turns Ratio
1:1 Turns Ratio
TTIP
2-Frame
Slip Buffer
Elastic Store
Tx Serial
Data In
Tx LIU
Interface
Tx Framer
Rx Framer
TRING
Tx Serial
Clock
LLB
LB
RTIP
2-Frame
Slip Buffer
Elastic Store
Rx Serial
Data Out
Rx LIU
Interface
RRING
Rx Serial
Clock
LIU &
Loopback
Control
PRBS
Generator &
Analyser
HDLC/LAPD
Controllers
Performance
Monitor
RxLOS
Line Side
8kHz sync
OSC
DMA
Interface
Microprocessor
Interface
Signaling &
Alarms
JTAG
Back Plane
1.544-16.384 Mbit/s
WR
ALE_AS
RD
4
3
μP
Select
INT
System (Terminal) Side
D[7:0]
A[14:0]
RDY_DTACK
TxON
Intel/Motorola µP
Configuration, Control &
Status Monitor
Memory
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
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