TXC-04251AIPQ Transwitch Corporation, TXC-04251AIPQ Datasheet - Page 78

• Manufacturer Part Number: TXC-04251AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-04251AIPQ

• Pin Count: 160
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

TXC-04251-MB
Ed. 4, March 2000
QT1M
TXC-04251
PORT n - RECEIVE STATUS REGISTER DESCRIPTIONS
The following descriptions pertain to the status registers assigned to port n, where n = 1 to 4. There are two
readable bit positions per alarm. One bit (in an odd-numbered address) indicates the detected alarm as
unlatched. The second bit (in the preceding even-numbered address) provides the alarm status as an latched
alarm indication. A latched bit position is set on a positive, negative, or positive/negative transition of the alarm,
or a positive level of the alarm. A latched alarm is cleared on a microprocessor read cycle of its address. Dur-
ing a read cycle, internal logic holds any increment to a counter until the read cycle is complete, and then
updates the counter afterwards.
C0 Port 4
C1 Port 4
Address
30 Port 1
60 Port 2
90 Port 3
31 Port 1
61 Port 2
91 Port 3
7-0
Bit
7
6
5
4
3
2
1
AnUNEQ A Drop Bus Port n Unequipped Indication: A 1 indicates that an Unequipped
Symbol
Latched
AnRDIS
AnSIZE
AnLOP
AnNDF
Alarms
AnAIS
AnRFI
An
Same alarms as the following address locations, except these alarm states are
latched.
A Drop Bus Port n VT/TU AIS Alarm: A 1 indicates that an AIS has been
detected in the V1/V2 pointer bytes for the VT/TU selected.
A Drop Bus Port n Loss Of VT/TU Pointer Alarm: A 1 indicates that a loss of
pointer has been detected in the V1/V2 pointer bytes for the VT/TU selected.
A Drop Bus Port n VT/TU Pointer Size Error Indication: A 1 indicates that
the receive size indicator in the pointer (Bits 5 and 6 in the V1 pointer byte) is
not 11 for the VT/TU selected. The detection and recovery time is immediate.
A Drop Bus Port n New Data Flag Indication: A 1 indicates that a New Data
Flag (1001 or 0001/1101/1011/1000) has been detected in the V1 pointer byte
for the VT/TU selected (i.e., bits 1-4 in the V1 byte are the inverse of the normal
0110 pattern or differ in only one bit).
A Drop Bus Port n Remote Server Defect Indication: A 1 indicates that
either a remote server defect alarm has been detected (bits 5, 6 and 7 in Z7 are
equal to 101), or an RDI has been detected coming from older equipment (bit 8
in V5 equals 1 when bits 6 and 7 in Z7 are equal to 00 or 11). The number of
consecutive events used for detection and recovery is determined by control bit
V5AL10.
A Drop Bus Port n Remote Failure Indication: A 1 indicates that bit 4 in the
V5 byte is equal to 1 for the VT/TU selected. The detection and recovery time is
immediate.
status has been detected in the V5 signal label (Bits 5-7 in V5 = 0) for the
VT/TU selected in the A side drop bus. An unequipped signal label is equal to
000. Five or more consecutive received unequipped signal labels will cause
this alarm. Recovery occurs when five or more consecutive signal labels are
received not equal to 000. The following alarms will not cause an unequipped
indication:
- H4 alarm (AnDH4E) when DV1SEL is 0.
- Loss of pointer alarm (AnLOP)
- VT/TU AIS alarm (AnAIS)
- Upstream AIS detected (AnAISI) when HEAISE is 1
(n is the STS-1 or AU-3 identifier).
DATA SHEET
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Description