3-34
Cisco 7200 VXR Installation and Configuration Guide
OL-5013-09
Chapter 3 Installing a Cisco 7200 VXR Router
Connecting I/O Controller, NPE-G1, or NPE-G2 Cables
The MII port uses two 56 screw-type locks, called jackscrews, to secure the cable or transceiver to the
port. MII cables and transceivers have knurled thumbscrews that you fasten to the jackscrews on the MII
port and tighten with your fingers. Use the jackscrews to secure your MII cable to the MII port.
Figure 3-27 MII Port
Table 3-12 lists the pinouts and signals for the I/O controller MII port.
Connecting to the Console and Auxiliary Ports
The NPE-G1, NPE-G2, and all I/O controllers have a DCE-mode console port for connecting a console
terminal, and a DTE-mode auxiliary port for connecting a modem or other DCE device (such as a
CSU/DSU or other router) to your router.
1 Pin 1 3 Pin 21
2 Jackscrew
Tab le 3-12 MII Port Pinouts
Pin
1
1. Any pins not indicated are not used.
In Out I/O Description
14–17 — Yes — Transmit Data (TxD)
12 Yes — — Transmit Clock (Tx_CLK)
2
2. Tx_CLK and Rx_CLK are provided by the external transceiver.
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)
2
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)
