PM7346 S/UNI-QJET
DATASHEET
PMC-960835
ISSUE 6
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
AIS, and remote alarm indication are detected. Further, when processing G.832
formatted data, parity errors, far end receive failure, and far end block errors are
also detected; and the Trail Trace message may be extracted and made available
through the microprocessor port. HDLC receivers are provided for either the
G.832 Network Requirement or the G.832 General Purpose Data Link support.
In the J2 receive direction, the S/UNI-QJET frames to G.704 6.312 MHz signals
with a maximum average reframe time of 5.07ms. An alternate framing algorithm
which uses the CRC-5 bits to rule out 99.9% of all static mimic framing patterns
is available with a maximum average reframe time of 10.22ms when operating
-4
with a 10 bit error rate. The alternate framing algorithm can be selected via the
CRC_REFR bit in the J2-FRMR Configuration Register. Line code violations,
loss of signal, loss of frame, framing bit errors, physical layer AIS, payload AIS,
CRC-5 errors, Remote End Alarm, and Remote Alarm Indication are detected.
HDLC receivers are provided for Data Link support.
Error event accumulation is also provided by the S/UNI-QJET. Framing bit errors,
line code violations, parity errors, path parity errors and far end block errors are
accumulated, when appropriate, in saturating counters for DS3, E3, and J2
frames. Loss of Frame detection for DS3, E3, and J2 is provided as
recommended by ITU-T G.783 with integration times of 1ms, 2ms, and 3ms.
In the DS3 transmit direction, the S/UNI-QJET inserts DS3 framing, X and P bits.
When enabled for C-bit parity operation, bit-oriented code transmitters and
HDLC transmitters are provided for insertion of the FEAC channels and the Path
Maintenance Data Links into the appropriate overhead bits. Alarm Indication
Signals can be inserted by using internal register bits; other status signals such
as the idle signal can be inserted when enabled by internal register bits. When
M23 operation is selected, the C-bit Parity ID bit (the first C-bit of the first M sub-
frame) is forced to toggle so that downstream equipment will not confuse an
M23-formatted stream with stuck-at 1 C-bits for C-bit Parity application.
In the E3 transmit direction, the S/UNI-QJET inserts E3 framing in either G.832
or G.751 format. When enabled for G.832 operation, an HDLC transmitter is
provided for insertion of either the Network Requirement or General Purpose
Data Link into the appropriate overhead bits. The Alarm Indication Signal and
other status signals can be inserted by internal register bits.
In the J2 transmit direction, the S/UNI-QJET inserts J2 6.312 Mbit/s G.704
framing. HDLC transmitter are provided for insertion of the Data Links. CRC-5
check bits are calculated and inserted into the J2 multiframe. External pins are
provided to enable overwriting of any of the overhead bits within the J2 frame.
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 17
PMC [ PMC-SIERRA, INC ]
