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L3M
TXC-03452B
DATA SHEET
144-Lead 208-Lead
QFP BGA
Lead No. Lead No.
Symbol
I/O/P
Type
Name/Function
ADATA
(7-0)
63 - 70
O(T) TTL4mA Add Data Byte: Byte-wide data that corresponds to the
STM-1/STS-3/STS-1 time slots that are placed on the add
bus. Bit 7 corresponds to bit 1 in the STM-1/SONET trans-
mission format. This bus is forced to a high impedance
state when the control bit ADDZ is set to 1, or when ADD is
inactive (high).
N11,
T11,
R11,
P12,
T12,
P13,
R13, T14
OVERHEAD COMMUNICATIONS CHANNEL INTERFACE
144-Lead 208-Lead
Symbol
QFP
BGA
I/O/P
Type
Name/Function
Lead No. Lead No.
ROCHD
25
O
TTL4mA Receive Overhead Comm Channel Data: Unaligned data
output for the overhead communications channel “O”-bits
from the DS3 or E3 formats. The “O”-bits are clocked out of
the L3M device on negative transitions of the ROCHC clock
signal.
L4
ROCHC
TOCHC
TOCHD
26
90
91
O
O
I
TTL4mA Receive Overhead Comm Channel Clock: A gapped 720
kHz output clock with an average frequency of 144 kHz for
clocking out the transmit overhead communications channel
bits to external circuitry.
L3
TTL4mA Transmit Overhead Comm Channel Clock: A gapped 720
kHz output clock with an average frequency of 144 kHz for
sourcing the transmit overhead communications channel
bits from external circuitry.
J14
J13
TTL
Transmit Overhead Comm Channel Data: Data input for
the overhead communications channel in the DS3 or E3 for-
mats. Data is clocked into the L3M device on positive transi-
tions of the TOCHC clock signal. The bits are multiplexed
into the “O”-bit positions unaligned regarding bit position
and subframe number. This input is enabled by the EXOO
control bit. When enabled, the lead must be grounded if it is
desired to insert zeroes in the corresponding fixed stuff
locations.
TXC-03452B-MB
Ed. 6, April 2001
- 18 of 96 -
ETC [ ETC ]
