Cisco 30 VIP Spécifications télécharger pdf (Page 35)

VIP-FE-TX Installation and Configuration 35

FE-TX Port Adapter Functions

The MII receptacle uses 2-56 screw-type locks, called jackscrews (shown in Figure 20), to secure

the cable or transceiver to the MII port. MII cables and transceivers have knurled thumbscrews

(screws you can tighten with your ﬁngers) that you fasten to the jackscrews on the FE-TX port

adapter’s MII connector. Use the jackscrews to provide strain relief for your MII cable. (The RJ-45

modular plug has strain relief functionality incorporated into the design of its standard plastic

connector.) Figure 20 shows the MII female connector.

Figure 20 FE-TX MII Connection, Receptacle

Table 4 lists the MII connector pinout and signals. MII cables are available commercially.

Table 4 FE-TX MII Connector Pinout

1. Any pins not indicated are not used.

2. Tx_CLK and Rx_CLK are generated by the external transceiver.

In Out In/Out Description

14–17 – Yes – Transmit Data (TxD)

12 Yes – – Transmit Clock (Tx_CLK)

11 – Yes – Transmit Error (Tx_ER)

13 – Yes – Transmit Enable (Tx_EN)

3 – Yes – MII Data Clock (MDC)

4–7 Yes – – Receive Data (RxD)

9 Yes – – Receive Clock (Rx_CLK)

10 Yes – – Receive Error (Rx_ER)

8 Yes – – Receive Data Valid (Rx_DV)

18 Yes – – Collision (COL)

19 Yes – – Carrier Sense (CRS)

2 – – Yes MII Data Input/Output (MDIO)

22–39 – – – Common (ground)

1, 20, 21, 40 – – – +5.0 volts (V)

ckscrew Pin 1

Pin 21

H2943

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 43 44

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Cisco 30 VIP Spécifications Page 35