PMC-Sierra, Inc.
PM6541 E1XC-EVBD
TELECOM STANDARD PRODUCT
PMC-930917
ISSUE 1
E1XC EVALUATION DAUGHTERBOARD
TAP
TAP
BTPCM
BTSIG
BTFP
BTPCM
BTSIG
BTFP
E-1
Transmit
E-1
Transmit
C
u
s
t
o
m
e
r
N
e
t
w
o
r
TAN
TC
BTCLK
BTCLK
TAN
AVD
AVD
TC
BRFPI
BRCLK
BRFPI
BRCLK
BRPCM
BRSIG
BRFPO
RCLKO
RFP
BRPCM
BRSIG
BRFPO
RCLKO
RFP
RAS
RAS
E-1
E-1
Receive
k
Receive
REF
RRC
REF
RRC
#1
#2
XCLK
XCLK
AVS
AVS
37.056MHz
AVS
AVS
Figure 2: Jitter Attenuating "CSU" Application Hookup
Transmit/Receive Interface
2.9
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
PMC [ PMC-SIERRA, INC ]
