Specifications

4-9
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 4 Verifying Modem Performance
Understanding Modem Modulation Standards
V.90 Basic Rules
Many circuit components work together to deliver V.90 modulation. See Figure 4-4.
Figure 4-4 V.90 Network Components
Here are the V.90 basic rules:

Select recommended modem code. The following are reliable V.90 releases at the time of this
publication:
`
MICA portware version 2.6.2.0
`
Microcom firmware version 5.2.1.0
The latest modem code is posted on CCO at the following URL. You must be a registered CCO user
to view the link:
http://www.cisco.com/kobayashi/sw-center/sw-access.shtml

Run a Cisco IOS release that is compatible with V.90. Table 4-3 shows the V.90 supported
Cisco IOS Releases at the time of this publication.
27168
PSTN
Client
DTE
Client
DCE
House
wiring
Local
loop
DS0
circuit
through
PSTN
Digital
line
NAS
Digital
modem
Table 4-3 V.90 Supported Cisco IOS Releases
Chassis Modem Type Cisco IOS
Cisco AS5800 MICA 11.3(6+)AA
12.0(1+)T
Cisco AS5300 MICA
Microcom
12.0(1+)
11.3(5+) {T, AA, NA}
11.2(16+)P
Cisco AS5200 MICA
Microcom
11.3(5+) {T and AA}
12.0(1+)
11.2(14+)P (Microcom only)
Cisco 3600 MICA 12.0(1+)
11.3(5+) {T, AA, NA}
11.2(16+)P