TXC-03453BROG Transwitch Corporation, TXC-03453BROG Datasheet - Page 80

• Manufacturer Part Number: TXC-03453BROG
• Manufacturer: Transwitch Corporation

Specifications of TXC-03453BROG

• Screening Level: Industrial
• Package Type: BGA
• Lead Free Status / Rohs Status: Compliant

September 2003
TL3M
TXC-03453B
PRELIMINARY TXC-03453B-MB, Ed. 3
Address
(cont.)
XB0
XB1
XB2
7-0
Bit
5
4
3
2
1
0
7
6
5
BUSERR
PSLERR
Symbol
C2EQ0
L3LOS
L3LOC
E1AIS
PAIS
LOP
RDI
Bus Parity Error: This unlatched alarm indicates that a parity error has
been detected on the Drop bus. Odd parity is calculated over the DD(7-0),
DSPE, DC1J1, and DC1 leads. Other than providing this alarm, no action is
taken by the channel or device.
E1 Byte AIS Detected: The E1 byte in the VC-4 and the E1 byte plus the
adjoining bytes may be used to carry an upstream in-band SDH/SONET
line and path AIS indication. This unlatched alarm indicates that AIS has
been detected in the E1 byte corresponding to AU-3/STS-3 STS-1.
Please note: For TUG-3 operation, the first E1 byte in the VC-4 is moni-
tored. The alarm occurs when 5 out of 8 ones are detected once. Recovery
occurs when fewer than 5 out of 8 bits are equal to 1 once.
TUG-3 Loss Of Pointer Alarm: An unlatched TUG-3 loss of pointer alarm
occurs when a New Data Flag (NDF) or an invalid pointer is detected for
eight consecutive frames. Recovery occurs when a valid pointer is received
for three consecutive frames.
TUG-3 Path AIS Alarm: An unlatched TUG-3 Path Alarm Indication Signal
(PAIS) is activated when all ones are detected in the 16-bit pointer word (H1
and H2) for three consecutive frames. Recovery occurs when a valid NDF is
received, or a valid pointer is detected, for three consecutive frames.
Path Signal Label Error: This unlatched alarm indicates that the compari-
son between the received C2 byte and the microprocessor-written C2 byte
did not match for 5 consecutive times. Recovery to 0 occurs when the com-
parison matches five times consecutively.
Unequipped Alarm: This unlatched unequipped alarm is detected when
the C2 byte is equal to 00H 5 consecutive times. Recovery occurs when the
C2 byte is not equal to 00H five consecutive times.
This register contains latched bits that correspond to the unlatched bits in
register XB0H. These latched bits are reset to 0 when they are read.
Receive RDI Alarm: When RDI5 is set to 0, an unlatched RDI alarm occurs
when bit 5 in the G1 byte is equal to 1 for 10 consecutive frames. Recovery
occurs when a 0 has been detected for 10 consecutive frames. When RDI5
is a 1, detection and recovery of the alarm is set to 5 consecutive events
instead of 10.
Transmit Line Loss Of Signal: For an E3 signal, an unlatched line loss of
signal alarm occurs when either the positive or negative rail is stuck low for
256 bit times. Recovery occurs when there are at least 32 transitions (on
both positive and negative rails) in a count of 256 clock cycles. For a DS3
signal, a loss of signal alarm occurs when either the positive or negative rail
is stuck low for 200 bit times. Recovery occurs on the first line signal transi-
tion (both positive and negative rails).
When the interface is configured for NRZ operation, an active high on the
TNEGn/LOSn lead can be used to provide an external loss of signal indica-
tion. Detection and recovery are immediate, following the LOSn transitions.
Transmit Line Loss of Clock: This unlatched alarm indicates the incoming
line clock (TCLKn) signal has been stuck high or low for approximately 225
ns. Recovery occurs within 100 ns of the first line clock transition. ACLK
(lead P1), when ABTIM (lead B21) is asserted or DCLK (lead K3), when
ABTIM is unasserted, must be present for this alarm to function.
DATA SHEET
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