Datasheet

Installing 2T16S Network Processor Modules in the Cisco 4000 Series

78-3277-03

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, as shown in Figure 17.

X.21 cables are available as either DTE (DB-15 plug) or DCE (DB-15 receptacle).

Figure 17 X.21 Adapter Cable Connectors, Network End

Low-Speed Serial Cables

The compact, octal serial cables for the low-speed serial ports contain a Molex 200-pin, D-shell

receptacle at the router end and eight receptacles or plugs at the network end. The cable attached to the

low-speed serial port determines the mode (DTE or DCE) of the eight serial interfaces. For each octal

cable, all of the eight network-end interfaces must be either DTE or DCE, but the module itself will

support DCE devices on one low-speed port and DTE devices on the other.

Following are the product numbers and figure references for the octal low-speed serial cable.

Note For pinout descriptions, see the see the section “Cabling Specifications” in the Cisco 4000 Series

Installation Guide. Although the printed manual ships with your router, the most current version appears

on the on the World Wide Web at WWW: http://www.cisco.com and on the Documentation CD that

ships with your router.

DCE

DTE

H1346a

Cable Product Number Description Figure Reference

CAB-OCT-232-MT DTE mode—Molex LFH 200-pin

connector and 25-pin Winchester-type

EIA/TIA-232 plug

Figure 18 and

Figure 13

CAB-OCT-232-FC DCE mode —Molex LFH 200-pin

connector and 34-pin Winchester-type

EIA/TIA-232 receptacle

Figure 18 and

Figure 13

CAB-OCT-V35-FC DTE mode—Molex LFH 200-pin

connector and 34-pin Winchester-type

V.35 plug

Figure 19 and

Figure 16

CAB-OCT-V35-MT DTE mode—Molex LFH 200-pin

connector and 34-pin Winchester-type

V.35 receptacle

Figure 19 and

Figure 16