VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC8150
2.488Gb/s SONET/SDH
Overhead Monitor
The high speed data and clock output drivers consist of a differential pair designed to drive a 50
Ω
transmis-
sion line. The transmission line should be terminated with a 100
Ω
resistor at the load between true and comple-
ment outputs (See Figure 5). No connection to a termination voltage is required. The output driver is back
terminated to 50
Ω
on-chip, providing a snubbing of any reflections. If used single-ended, the high speed output
driver must still be terminated differentially at the load with a 100
Ω
resistor between true and complement out-
puts.
Figure 6: Transport Overhead
STS-48(48)
STS-48(3)
STS-48(2)
STS-48(1)
Framing
A1
Framing
A2
Orderwire
E1
Datacom
D2
Pointer
H2
APS
K1
Datacom
D5
Datacom
D8
Datacom
D11
REI-L
M0
STS-48
J0
User
F1
Datacom
D3
Pointer
Action
H3
APS
K2
Datacom
D6
Datacom
D9
Datacom
D12
Orderwire
E2
STM-1(1)
BIP-8
STS-48
B1
Datacom
D1
Pointer
H1
BIP-8
STS-48(1)
B2
Datacom
D4
Datacom
D7
Datacom
D10
Sync
S1
Note: Only bytes from the first STS-1 of the SONET signal are output from the SOHOUT[7:0] port.
G52186-0, Rev. 3.0
10/12/98
©
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 7
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