txc-03456 TranSwitch Corporation, txc-03456 Datasheet - Page 11

• Manufacturer Part Number: txc-03456
• Description: Device Level Mapper
• Manufacturer: TranSwitch Corporation

RECEIVE AND TRANSMIT PATH OVERHEAD BYTE INTERFACE
Symbol
RPOHD
RPOHC
RPOHF
TPOHD
TPOHC
TPOHF
Pin No.
11
92
95
93
9
8
I/O/P
O
O
O
O
O
I
TTL4mA
TTL4mA
TTL4mA
TTL4mA
Type
TTL
TTL
Receive Path Overhead Framing: A positive, one clock cycle
wide, framing pulse that is synchronous with bit 1 in the J1
byte in the POH interface data.
Receive Path Overhead Data: The serial output for the nine
Path Overhead bytes: J1, B3, C2, G1, F2, H4, Z3, Z4, and Z5
bytes. The bytes are clocked out, starting with bit 1 in J1, on
negative transitions of the clock signal (RPOHC) when the
POH feature is enabled.
Receive Path Overhead Clock: The nine POH bytes and
RAIPD data are clocked out on negative transitions of this
clock signal (RPOHC).
Transmit Path Overhead Framing: A positive, one clock
cycle wide, framing pulse that is synchronous with bit 1 in the
J1 byte in the POH interface data.
Transmit Path Overhead Data: A serial input for the Path
Overhead bytes: J1, C2, G1, F2, H4, Z3, Z4, and Z5 bytes.
The B3 byte time slot must be provided, but the contents are
ignored by the L4M. The bytes are clocked in, starting with bit
1 in J1, on positive transitions of the clock signal (TPOHC). 8
bits are clocked in during the B3 Byte time, but they are
ignored by the L4M device. The L4M recalculates the B3 byte
parity value. The POH bytes are ignored when a low is placed
on the POHDIS lead (pin 19).
Transmit Path Overhead Clock: The transmit clock used for
clocking in the Path Overhead bytes. Data is clocked in on
positive transitions of the clock.
DATA SHEET
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Name/Function
Ed. 1A, January 2000
TXC-03456
TXC-03456-MB
L4M