VIP-4R/4T Installation and Configuration 35
VIP Port Adapter Functions
4R Port Adapter Receptacle Pinout
Table 2 lists the pinout for the DB-9 receptacle used on the 4R port adapter.
Table 2
Token Ring Signals
Attaching 4R Port Adapter Interface Cables
The Token Ring ports on the 4R port adapter run at either 4- or 16 Mbps. You need one Token Ring
interface cable for each 4R port adapter interface you want to use. Token Ring interface cables are
not available from Cisco Systems, but are commercially available through outside cable vendors.
Following is the procedure for attaching Token Ring cables to the 4R port adapter:
Step 1
Determine which 4R port adapter ports you want to use.
Note
The IBM Token Ring specifies a star topology, with all end stations connected through a
device called an MSAU. IEEE 802.5 does not specify any topology, although most implementations
are based on a star configuration with end stations attached to a device called an MAU. Also, IBM
Token Ring specifies twisted-pair cabling, whereas IEEE 802.5 does not specify media type. Most
Token Ring networks use shielded twisted-pair (STP) cabling; however, some networks that operate
at 4 Mbps use UTP cable.
Pin
Signal
1
Ring-In B
5
Ring-Out A
6
Ring-In A
9
Ring-Out B
10 and 11
Ground
