The auxiliary port on the ASP is a male, EIA/TIA-232 DTE, DB-25 plug to which you can attach a
channel service unit/data service unit (CSU/DSU) or other equipment in order to access the switch
from the network. (See Figure 6.) Table 2 lists the EIA/TIA-232 signals used on this port.
The asynchronous auxiliary port supports hardware flow control and modem control.
Table 2 Auxiliary Port Signals
Figure 6 AUX and Console Connectors
Feature Card
The feature card is a daughter card of the ASP module that implements a number of value-added
capabilities over and above the base switch mechanisms. These include:
• Per-virtual channel (VC) statistics collection
• Multicast cell replication
• Congestion control for the available bit rate (ABR) service
• Policing
• Threshold based Selective Discard
• Intelligent Early Packet Discard
Pin Signal Direction Description
2 TxD ---> Transmit data
3 RxD <--- Receive data
4 RTS ---> Request to send (used for hardware flow control)
5 CTS <--- Clear to send (used for hardware flow control)
6 DSR <--- Data set ready
7 Signal ground -- Signal ground
8 CD <--- Carrier detect (used for modem control)
20 DTR ---> Data terminal ready (used for modem control only)
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