IBM3009K2672
IBM SONET/SDH Framer
Telecom Bus Interface Pin Descriptions (Sheet 3 of 6)
Pin Name
Pin No.
I/O
Type
Pin Description1
Telecom Bus 3 Transmit Input Synchronous Payload Envelope Signal:
This signal is high for the SPE bytes and low for the TOH bytes on Telecom
Bus 3. If transmit retiming is turned off and no J1 pulse is present in
TXTB3C1J1, this pin can be tied low.
TXTB3SPE
K06
I
LVTTL-5sd
Telecom Bus 3 Transmit Input Parity:
Parity for the signals of Telecom Bus 3. It should be calculated by the trans-
mitting device according to the settings of the PFULL3, PEVEN3, and
PENA3 control bits in the SONET/SDH framer. Parity errors are reported
via the TB3PAR alarm bit, but no actions are taken.
TXTB3PAR
TXTB3FAIL
K07
J01
I
I
LVTTL-5sp
LVTTL-5sp
Telecom Bus 3 Transmit Input Failure Indication:
TXTB3FAIL indicates that a failure has occurred on the device transmitting
on Telecom Bus 3. When TXTB3FAIL goes high, AIS-P is transmitted on
STM-1 #3/STS-3c #3.
TXTB4DATA(7)
TXTB4DATA(6)
TXTB4DATA(5)
TXTB4DATA(4)
TXTB4DATA(3)
TXTB4DATA(2)
TXTB4DATA(1)
TXTB4DATA(0)
M06
M07
M08
L01
L02
L03
L05
L07
Telecom Bus 4 Transmit Input Data:
19.44 Mbytes/s AU-4 (transmit retiming turned off) or VC-4 (transmit retim-
ing turned on) data input on these pins is inserted into the outgoing STM-1
#4. This data is clocked into the SONET/SDH framer on the rising edge of
TXTB4CLK. Bit 7 is the MSB and is transmitted first.
I
LVTTL-5sp
Telecom Bus 4 Transmit Input Clock:
All of the signals for Telecom Bus 4 are clocked into the SONET/SDH
framer on the rising edge of this 19.44 MHz clock. TXTB4CLK must be fre-
quency locked to either TXCCLK or TXCCLK if transmit retiming is not per-
formed.
TXTB4CLK
TXTB4C1J1
N03
N05
I
I
LVTTL-5sp
LVTTL-5sd
Telecom Bus 4 Transmit Input Slot Indication:
When the TXTB4SPE signal is high, TXTB4C1J1 indicates the position of
the J1 byte. When the TXTB4SPE signal is low, TXTB4C1J1 indicates the
position of the C1 byte. The J1 and C1 pulses are required if transmit retim-
ing is turned on. If transmit retiming is turned off, this signal becomes a slot
identifier.
Telecom Bus 4 Transmit Input Synchronous Payload Envelope Signal:
This signal is high for the SPE bytes and low for the TOH bytes on Telecom
Bus 4. If transmit retiming is turned off and no J1 pulse is present in
TXTB4C1J1, this pin can be tied low.
TXTB4SPE
TXTB4PAR
TXTB4FAIL
N07
M02
M04
I
I
I
LVTTL-5sd
LVTTL-5sp
LVTTL-5sp
Telecom Bus 4 Transmit Input Parity:
Parity for the signals of Telecom Bus 4. It should be calculated by the trans-
mitting device according to the settings of the PFULL4, PEVEN4, and
PENA4 control bits in the SONET/SDH framer. Parity errors are reported
via the TB4PAR alarm bit, but no actions are taken.
Telecom Bus 4 Transmit Input Failure Indication:
TXTB4FAIL indicates that a failure has occurred on the device transmitting
on Telecom Bus 4. When TXTB4FAIL goes high, AIS-P is transmitted on
STM-1 #4/STS-3c #4.
RXCCLK
RXCFRM
W07
T08
I
I
No Connect: Leave unconnected.
No Connect: Leave unconnected.
1. When STM-4c or STS-12c frames are processed, the four transmit and four receive Telecom Buses operate in parallel as two 32-
bit wide Telecom Buses.
Pin Information
ssframer.01
8/27/99
Page 38 of 279
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