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Cisco 860 Series, Cisco 880 Series, and Cisco 890 Series Integrated Services Routers Hardware Installation Guide
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Chapter 3 Connecting the Router
Connecting a Data BRI Port
Note Antenna orientation can increase or decrease signal reception due to polarization. Typically, an SP’s
transmitting antenna on the BTS is a vertically polarized omnidirectional antenna, which means the
electromagnetic waves are transmitted from it in a vertical plane. Hence, the receiving antenna needs to
be vertically oriented too in order to receive the best signal. As the angle of the antenna orientation is
changed from vertical to horizontal, only an angular component of the signal is picked up by the antenna.
Therefore, if the antenna orientation is horizontal, the antenna picks up the least signal. The signal is
received by the antenna as a result of it bouncing off of reflective surfaces. Hence, depending on where
the antenna is placed, it may receive different signal strengths. However, the recommended position is
vertical.
For additional information on all the available cables and antennas available for 3G, go to:
http://www.cisco.com/en/US/docs/routers/access/1800/1861/software/feature/guide/mrwlsgsm.html#w
p1262730
Connecting a Data BRI Port
You can connect the Data BRI port to the ISDN service provider as a backup link to the WAN port in
case the primary xDSL (general term referring to various forms of DSL, including global industry
standard symmetrical high-speed DSL [G.SHDSL]) WAN service fails. The Data BRI connection is not
available on the third-generation (3G) models.
The cabling requirements for the ISDN S/T connection are as follows:
•You must provide two unshielded Category 5 cables. The first cable connects the NT1 box to the
splitter, and the second cable connects the splitter to the wall jack.
•There are RJ-45 connectors at both ends of the default orange ISDN S/T cable. However, an
RJ-45–to–RJ-11 ISDN S/T cable is available upon request if the wall jack at the site requires an
RJ-11 connector. Contact your router reseller for the appropriate cable.
Caution Both LAN and WAN ports use RJ-45 connectors. Use caution when connecting cables to these
connectors. To avoid damage to the router, do not connect telephone-network voltage (TNV) circuits
(such as ISDN or DSL circuits) to safety extra-low voltage (SELV) circuits (such as LAN circuits).
Although the following procedure shows a Cisco 888W data router, this procedure applies to all
Cisco 880 series router with a Data BRI port.
Table 3-2 Cisco Adapter Cables for Use with 3G Fixed Routers
Cisco Product Number
Antenna Adapter
Length Insertion Loss Frequency (MHz)
3G-ACC-SSMB-TNC 14.5 inches 0.66 dB 2100
3G-ACC-TS9-TNC 13.5 inches 0.62 dB 2100