© VITESSE SEMICONDUCTOR CORPORATION

Page 7

10/12/98

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC8150

2.488Gb/s SONET/SDH

Overhead Monitor

G52186-0, Rev. 3.0

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

Note: Only bytes from the first STS-1 of the SONET signal are output from the SOHOUT[7:0] port.

STS-48(2)

STS-48(1)

STM-1(1)

Framing

A1

Framing

A2

STS-48

J0

BIP-8

STS-48

B1

Orderwire

E1

User

F1

Datacom

D1

Pointer

H1

Pointer

Action

H3

BIP-8

STS-48(1)

B2

APS

K1

APS

K2

Sync

S1

REI-L

M0

Orderwire

E2

Datacom

D2

Datacom

D3

Pointer

H2

Datacom

D4

Datacom

D5

Datacom

D6

Datacom

D7

Datacom

D8

Datacom

D9

Datacom

D10

Datacom

D11

Datacom

D12

STS-48(3)

STS-48(48)