Proprietary TranSwitch Corporation Information for use Solely by its Customers
L3M
TXC-03452B
DATA SHEET
PATH OVERHEAD INTERFACE
144-Lead 208-Lead
Symbol
QFP
BGA
I/O/P
Type
Name/Function
Lead No. Lead No.
RPOHD
30
31
O
TTL4mA Receive Path Overhead Data: The serial output for the
nine path overhead bytes. The POH bytes are clocked out
on negative transitions of the clock signal (RPOHC).
M3
M1
RPOHF
O
TTL4mA Receive Path Overhead Framing: A positive one clock
cycle (RPOHC) wide output framing pulse that is synchro-
nous with the J1 data of RPOHD. This signal is also used
as the framing pulse for the receive alarm indication port
data (RAIPD).
RPOHC
TPOHC
TPOHF
TPOHD
32
79
80
81
O
O
O
I
TTL4mA Receive Path Overhead Clock: A gapped clock used for
clocking out the path overhead bytes, and receive alarm
indication port data (RAIPD).
M2
M13
L15
L16
TTL4mA Transmit Path Overhead Clock: A gapped clock used for
clocking the path overhead bytes from an external circuit
into the L3M device.
TTL4mA Transmit Path Overhead Framing: A positive one clock
cycle (TPOHC) wide output framing pulse that determines
the start of the J1 byte in TPOHD.
TTL
Transmit Path Overhead Data: A serial input for the follow-
ing path overhead bytes: J1, C2, G1, F2, H4, Z3, Z4, and
Z5 bytes. The POH bytes are clocked into the L3M device
on positive transitions of the TPOHC clock signal. Eight bits
are clocked in during the B3 byte time, but they are ignored
by the L3M device.
TXC-03452B-MB
Ed. 6, April 2001
- 19 of 96 -
ETC [ ETC ]
