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Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
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Chapter 1 Preparing for Installation
Cisco ASR 9001 Router Port Connection Guidelines
Auxiliary Port Signals
The RP Auxiliary (AUX) port is a RJ-45 interface for connecting a modem or other data communication
equipment (DCE) device (such as another router) to the RP. The AUX port supports hardware flow
control and modem control.
Table 1-4 lists the signals used on the Auxiliary port.
Management LAN Ports Connection Guidelines
The RP has two RJ45 media-dependent interface (MDI) Ethernet management LAN ports: MGT LAN 0
and MGT LAN 1 (see Figure 1-23).
These ports are used for IEEE 802.3 10BASE-T (10 Mbps), IEEE 802.3u 100BASE-TX (100 Mbps), or
1000BASE-T (1000 Mbps) Ethernet connections.
The transmission speed of the management LAN ports is not user-configurable. The transmission speed
is set through an auto-sensing scheme on the RP; the speed is determined by the network to which that
the Ethernet port is connected. The combined total input rate of both MGT LAN 0 and MGT LAN 1 is
about 12 Mbps.
Management port characteristics are:
•Maximum transmission unit (MTU) is fixed at 1514 and cannot be configured.
•Flow control is disabled and cannot be configured.
•Input unicast packets with an unknown destination address are filtered and dropped.
•Autonegotiation of port speed (10/100/1000) and duplex (full/half) is supported. Autonegotiation
cannot be disabled.
Table 1-5 lists the signals used on the Management LAN ports.
Table 1-4 RP AUX Port Signals
AUX Port Pin Signal Input/Output Description
1 RTS Output Request to send
2 DTR Output Data terminal ready
3 TxD Output Transmit data
4 GND — Signal ground
5 GND — Signal ground
6 RxD Input Receive data
7 DSR Input Data set ready
8 CTS Input Clear to send
Table 1-5 RP Management LAN Port Signals
MGT LAN Port Pin 10Base-T, 100Base-TX Signal 1000Base-T Signal
1 Transmit+ BI_DA+
2 Transmit– BI_DA–
3 Receive+ BI_DB+