Specifications

4-21
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 4 Verifying Modem Performance
Initiating and Inspecting a V.90 Test Call
Full user help is disabled
Allowed transports are pad telnet rlogin udptn v120 lapb-ta. Preferred is pad t
elnet rlogin udptn v120 lapb-ta.
No output characters are padded
No special data dispatching characters
Step 8
Program the display window so it does not pause in the middle of a screen display:
5300-NAS>terminal length 0
Step 9
Generate traffic across the modem link. Perform a light-weight stress test between the modems to
generate meaningful modem-performance statistics.
5300-NAS>show modem log
Modem 1/0 Events Log:
3w4d :Startup event:MICA Hex modem (Managed)
Modem firmware = 2.7.1.0
3w4d :RS232 event: noRTS, noDTR, CTS, noDCD
3w4d :RS232 event: noRTS, DTR, CTS, noDCD
. . .
Snip
The output generated by the
show modem log
command sends a sizeable data stream across the modem
link—about 1 MB of data. The data should scroll freely for one or two minutes.
Step 10
Inspect the NAS modem that answered the call, and verify that it has acceptable connect speed,
throughput, and line shape. This example examines MICA modem 1/0. If you have Microcom modems,
enter the
modem at-mode
slot
/
port
command followed by the
at@e1
command.
5300-NAS>show modem operational-status 1/0
Modem(1/0) Operational-Status:
Parameter #0 Disconnect Reason Info: (0x0)
Type (=0 ): <unknown>
Class (=0 ): Other
Reason (=0 ): no disconnect has yet occurred
Parameter #1 Connect Protocol: LAP-M
Parameter #2 Compression: None
Parameter #3 EC Retransmission Count: 2
Parameter #4 Self Test Error Count: 0
Parameter #5 Call Timer: 118 secs
Parameter #6 Total Retrains: 0
Parameter #7 Sq Value: 3
Parameter #8 Connected Standard: V.90
Parameter #9 TX,RX Bit Rate: 48000, 28800
Parameter #11 TX,RX Symbol Rate: 8000, 3200
Parameter #13 TX,RX Carrier Frequency: 0, 1920
Parameter #15 TX,RX Trellis Coding: 0, 16
Parameter #16 TX,RX Preemphasis Index: 0, 6
Parameter #17 TX,RX Constellation Shaping: Off, Off
Parameter #18 TX,RX Nonlinear Encoding: Off, Off
Parameter #19 TX,RX Precoding: Off, Off
Parameter #20 TX,RX Xmit Level Reduction: 0, 0 dBm
Parameter #21 Signal Noise Ratio: 36 dB
Parameter #22 Receive Level: -19 dBm
Parameter #23 Frequency Offset: 0 Hz
Parameter #24 Phase Jitter Frequency: 0 Hz
Parameter #25 Phase Jitter Level: 0 degrees
Parameter #26 Far End Echo Level: -37 dBm
Parameter #27 Phase Roll: 0 degrees
Parameter #28 Round Trip Delay: 23 msecs
Parameter #30 Characters transmitted, received: 67109, 43
Parameter #32 Characters received BAD: 0