Cisco WS-C4003-RF Hardware Maintenance Manual - Page 39

X.21 Connections, EIA-530 Connections, EIA/TIA-232.

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Page 39 highlights

Network Connection Considerations Figure 2-15 V.35 Adapter Cable Connectors, Network End DTE DCE H1616a X.21 Connections The X.21 interface uses a 15-pin connection for balanced circuits and is commonly used in the United Kingdom to connect public data networks. X.21 relocates some of the logic functions to the DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than EIA/TIA-232. The network end of the X.21 adapter cable is a standard DB-15 connector. (See Figure 2-16.) X.21 cables are available as either DTE (DB-15 plug) or DCE (DB-15 receptacle). Figure 2-16 X.21 Adapter Cable Connectors, Network End 8 1 15 9 DTE DCE H1346a EIA-530 Connections EIA-530, which supports balanced transmission, provides the increased functionality, speed, and distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232, instead of the 37-pin connectors used for EIA/TIA-449. Like EIA/TIA-449, EIA-530 refers to the electrical specifications of EIA/TIA-422 and EIA/TIA-423. Although the specification recommends a maximum speed of 2 Mbps, EIA-530 is used successfully at 4 Mbps or faster speeds over short distances. The EIA-530 adapter cable is available in DTE mode only. The network end of the EIA-530 adapter cable is a standard DB-25 plug commonly used for EIA/TIA-232 connections. Figure 2-17 shows the DB-25 connector at the network end of the adapter cable. Figure 2-17 EIA-530 Adapter Cable Connector, Network End DTE H1615a Preparing for Installation 2-17

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Preparing for Installation
2-17
Network Connection Considerations
Figure 2-15
V.35 Adapter Cable Connectors, Network End
X.21 Connections
The X.21 interface uses a 15-pin connection for balanced circuits and is commonly used in the
United Kingdom to connect public data networks. X.21 relocates some of the logic functions to the
DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than
EIA/TIA-232.
The network end of the X.21 adapter cable is a standard DB-15 connector. (See Figure 2-16.)
X.21 cables are available as either DTE (DB-15 plug) or DCE (DB-15 receptacle).
Figure 2-16
X.21 Adapter Cable Connectors, Network End
EIA-530 Connections
EIA-530, which supports balanced transmission, provides the increased functionality, speed, and
distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232, instead of the
37-pin connectors used for EIA/TIA-449. Like EIA/TIA-449, EIA-530 refers to the electrical
specifications of EIA/TIA-422 and EIA/TIA-423. Although the specification recommends a
maximum speed of 2 Mbps, EIA-530 is used successfully at 4 Mbps or faster speeds over short
distances.
The EIA-530 adapter cable is available in DTE mode only. The network end of the EIA-530 adapter
cable is a standard DB-25 plug commonly used for EIA/TIA-232 connections. Figure 2-17 shows
the DB-25 connector at the network end of the adapter cable.
Figure 2-17
EIA-530 Adapter Cable Connector, Network End
H1616a
DTE
DCE
1
8
15
9
DCE
DTE
H1346a
DTE
H1615a