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©2002 Vitesse Semiconductor Corporation

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

The VSC9187 is a VT1.5 Time Slot

Interchange (TSI) Device. It provides a

fully non blocking cross connect for 3024

VT1.5's that are all frequency, phase and

column aligned in addition to a pre-

grooming 2:1 UPSR selection. The device receives 9 x 622

Mb/s STS-12 working and protection backplane inputs and

performs all necessary functions to retime and align these

signals from the backplane. VT1.5 tributaries are then pre-

selected with a hardware 2:1 UPSR switch from the working

GENERAL DESCRIPTION:

VSC9187 Bromley - 3045 x 3045 VT1.5 TSI Switch Fabric

and protection timeslot with programmable holdover and pre-

hold switch timers. The results of the 2:1 hardware selection

are then made available to an internal 3024x3024 VT1.5 non-

blocking grooming switch, allowing a 5G UPSR ring to be

terminated. Alternatively, the 9 protection STS-12 backplane

inputs can remain unused and the VSC9188 can act as a 5G

VT1.5 switch. Output STS-1 delay management following the

crossconnect allows the VSC9187 to be used in subtended

switch applications with large scale STS-1 crossconnects

such as the VSC9182 40Gb/s STS-1 TSI.

VSC9187

VSC9187 BLOCK DIAGRAM:

LEG_DI_S[5:0]

LEG_RCLK_S

LEG_RSYN_S

[7:0]

[8:0]

LASB

[8]

TDM

MUX

9 x 622Mb/s

STS-12

Serial

Backplane

Inputs

(Service)

STS_DI_[8:0]

MUX

Low-Order Alarm Status Byte (LASB)

Inserted by VSC9188

(contains VTI.5 PM summary)

LEG_DI_P[5:0]

LEG_RCLK_P

LEG_RSYN_P

[16:9]

[17:9]

LASB

[17]

TDM

MUX

9 x 622Mb/s

STS-12

Serial

Backplane

Inputs

(Protection)

[8:0]

[8:0]

STS_DI_[17:9]

JTAG Interface

System Interface and PLL

HS-CLK LS-CLK

SYNC M-SYNC

CPU Interface

MUX

LEG_DO_S[5:0]

LEG_TCLK_S

LEG_TSYN_S

STS_DO_[8:0]

LEG_DO_P[5:0]

LEG_TCLK_P

LEG_TSYN_P

STS_DO_[17:9]

TDM

DEMUX

9 x 622Mb/s

STS-12

Serial

Backplane

Inputs

(Service)

TDM

DEMUX

9 x 622Mb/s

STS-12

Serial

Backplane

Outputs

(Protection)