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| 型號： | PM6541 |
| 廠商： | PMC-Sierra, Inc. |
| 英文描述： | E1XC EVALUATION DAUGHTERBOARD |
| 中文描述： | E1XC評價子板 |
| 文件頁數(shù)： | 27/49頁 |
| 文件大?。?/td> | 179K |
| 代理商： | PM6541 |
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PMC-Sierra, Inc.
PM6541 E1XC-EVBD
TELECOM STANDARD PRODUCT
PMC-930917
ISSUE 1
E1XC EVALUATION DAUGHTERBOARD
24
open. By appropriately making jumper connections to the other available clock
options, the backplane can be run at different rates, such 2.048 MHz or at an
externally supplied clock rate.
6.6
Transmit/Receive Interfaces
Three different transmit and receive interfaces are provided on the daughterboard.
The digital interface can be used by connecting to the two header blocks
immediately adjacent to each E1XC. Header blocks J13 and J15 provide the digital
interface for the east E1XC while headers J14 and J16 provide the interface for the
west E1XC. Before making use of these pins, the analog receiver of each E1XC
should be disabled. This is done by moving the jumpers on J31 and J3, which
provide power to RAVD, to the grounding position.
Two E-1 analog interfaces are also provided. Both the transmit and receive E-1
interfaces on each E1XC can be connected to either a mini-bantam or BNC
connector. The analog transmit and receive interface are passed through a 1:1.36
and 2:1 transformer, respectively, and then connected to either Bantam or BNC
connectors. The transmit mini-bantam is terminated with a 100 ohm resistor to
prevent "kick-back" when a plug is inserted or removed from the jack. The receive
BNC interface is a standard 75 ohm coax with stuffing options for ground or resistor
connections across the shield (or barrel).
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