Connecting The Wic-2A/S Interface Cables; Serial Cable - Cisco MWR 1941-DC - 1941 Mobile Wireless Router Hardware Installation Manual

Connecting the Network Cables
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Connecting the WIC-2A/S Interface Cables

This section describes how to connect the 2-port asynchronous/synchronous (A/S) serial modules
(WIC-2A/S) when using with the MWR 1941-DC router in a Cell Site DCN implementation.
The 2-port A/S serial module has "smart" serial ports. The serial cable attached to one of the module's
ports can determine the electrical interface type and mode (DTE or DCE).
Six types of serial cables (also called serial adapter cables or serial transition cables) are available from
Cisco Systems for use with the 2-port A/S serial module:
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All serial cables have a universal plug at the interface module end. The network end of each cable
provides the physical connectors that are most commonly used for the interface. For example, the
network end of the EIA/TIA-232 serial cable is a DB-25 connector, which is the most widely used
EIA/TIA-232 connector.
All serial interface types, except EIA-530, are available in DTE or DCE mode: DTE with a plug
connector at the network end and DCE with a receptacle at the network end. The V.35 assembly is
available in either mode with either gender at the network end. The EIA/TIA-530 assembly is available
in DTE only.
After you install the 2-port A/S serial module, use the appropriate serial cable to connect the serial port
on the module to one of the following types of equipment (see
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Cisco MWR 1941-DC Mobile Wireless Edge Router Hardware Installation Guide
3-8
The cable length from junction point to the patch panel is determined by the customer.
Stubs
MWR 1941-DC
E1/
T1
MWR 1941-DC
E1/
T1
All signals that propagate in the same direction must share the same twisted pair. For example, RX
TIP and RX RING must form a single twisted pair.
All unused twisted pairs should be cut flush on both ends of the cable. Any unused wire in a twisted
pair where one wire is in use should be cut flush at both ends.
EIA/TIA-232 serial cable assembly
EIA/TIA-449 serial cable assembly
V.35 serial cable assembly
X.21 serial cable assembly
EIA/TIA-530 serial cable assembly
EIA/TIA-530A serial cable assembly
Synchronous modem
DSU/CSU
Other DCE, if connecting to a digital WAN line
Junction point
Patch panel
Y-Cable
Chapter 3 Installing the Router
Figure 3-5):
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