PM6541 데이터 시트보기 (PDF) - PMC-Sierra

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PM6541

E1XC EVALUATION DAUGHTERBOARD

PMC-Sierra 

TELECOM STANDARD PRODUCT

PMC-930917

ISSUE 1

PMC-Sierra, Inc.

PM6541 E1XC-EVBD

E1XC EVALUATION DAUGHTERBOARD

N

E-1

Transmit

e

t

AVD

w

o

r

k

E-1

Receive

AVS

TAP

TAN

TC

BTPCM

BTSIG

BTFP

BTCLK

BRFPI

BRCLK

RAS

REF

RRC

BRPCM

BRSIG

BRFPO

RCLKO

RFP

XCLK #1

AVS

37.056MHz

BTPCM

BTSIG

BTFP

BTCLK

BRFPI

BRCLK

TAP

TAN

TC

BRPCM

BRSIG

BRFPO

RCLKO

RFP

#2 XCLK

RAS

REF

RRC

E-1

Transmit

C

u

AVD

s

t

o

m

E-1

e

Receive

r

AVS

AVS

Figure 2: Jitter Attenuating "CSU" Application Hookup

2.9 Transmit/Receive Interface

The daughterboard provides three different types of interfaces for the transmit and

receive signals. The two standard analog interfaces provided are a 120 ohm mini-

bantam interface and a 75 ohm BNC interface. The transmit mini-bantams are

terminated with a 200 ohm resistor on the TN/RN pins to prevent an excessive

voltage kick when mini-bantam plugs are inserted or removed. The BNC connector

barrel can optionally be terminated with a resistor to ground, or grounded directly, by

stuffing a resistor or shorting strap in locations R15, R16, R17, and R18. The

daughterboard is shipped with these 4 locations empty, thereby providing a 75• BNC

interface. The third interface provided is strictly digital and brings out all of the

E1XC's digital E-1 signals to header pins for easy test access. When the digital

interface is used each E1XC's analog receiver can be powered down by moving the

jumper on jumper block J31 or J32.

5

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