Cisco Cisco 4G LTE Enhanced High-Speed WAN Interface Cards for LATAM Information Guide
Q&A
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Ask the customer to verify with the provider that EVDO service is available in the area.
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Verify the RSSI, C/I, and ECIO values with the show cellular x/x/x radio command for both
EVDO and 1xRTT.
EVDO and 1xRTT.
RSSI values should be typically between -60 and -90 dBM, which indicates good coverage.
The C/I ratio should be as high as possible and ECIO values as low as possible. Lab tests
show ECIO equal to or less than -2 dB and throughput is beyond 800K down link.
Customers observing higher values might have a very noisy environment. This noise may
cause retransmissions of the packets, lower throughput, call drops, etc. Cisco does not
determine acceptable values; cellular carriers determine these values.
The C/I ratio should be as high as possible and ECIO values as low as possible. Lab tests
show ECIO equal to or less than -2 dB and throughput is beyond 800K down link.
Customers observing higher values might have a very noisy environment. This noise may
cause retransmissions of the packets, lower throughput, call drops, etc. Cisco does not
determine acceptable values; cellular carriers determine these values.
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Use a diversity antenna.
A diversity antenna might improve throughput performance because with diversity antennas
one antenna encounters less multipath propagation effects than the other. Note that the
diversity feature offers improvement only in the DL path and the feature activates with active
traffic.
one antenna encounters less multipath propagation effects than the other. Note that the
diversity feature offers improvement only in the DL path and the feature activates with active
traffic.
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Use another Cisco supported antenna with extension cables (a dipole antenna with 15-foot
extension or an omnidirectional antenna with 20- or 50-foot extension cables).
extension or an omnidirectional antenna with 20- or 50-foot extension cables).
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A site survey would help to determine how to achieve better signal characteristics.
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A.
Q.
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Q.
I have the cellular HWIC activated, but it appears that the interesting traffic is not able to
activate the dialer. When trying to ping anything, the router displays the following
response: "% unrecognized host or address, or protocol not running".
Verify that the following is configured:
Verify that the following is configured:
dialer-list 1 protocol ip permit
What configurations do I need to request for Domain Name System (DNS) server
addresses as part of IP Control Protocol (IPCP) negotiations?
The command ppp ipcp dns request under the cellular interface, as shown in the following
configuration, updates the name-server database on the router.
The command ppp ipcp dns request under the cellular interface, as shown in the following
configuration, updates the name-server database on the router.
interface Cellular0/3/0
ip address negotiated
encapsulation ppp
dialer in-band
dialer string gsm
dialer-group 1
async mode interactive
ppp chap hostname Cisco
ppp chap password 0 Cisco
ppp ipcp dns request
When I issue the show ip route command and during PPP negotiations, I see two routes
installed in the routing table (refer to the following configuration). Why do I see two
routes, and will that cause any problems?
Router#show ip route