Cisco AS5800 Specifications Page 104

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3-22
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 3 Operations
Verifying Modem Performance
Step 11 Enter the +++ command to jump back to the client modem and examine client-side performance
statistics. The modem connection to the NAS is not dropped.
5800-NAS>+++
OK
at
OK
In the example, the client modem reports both OK messages. The +++ modem-escape sequence is
similar to a routers Telnet-escape mode (Shift + Ctrl + 6 + x). See Figure 3-7.
Figure 3-7 Using Modem-Escape Mode to View Client-Side Modem Statistics
Parameter 30
Characters transmitted, received: 67109, 43
67109 characters are transmitted by the NAS modem to the client
modem over the synchronous/asynchronous connection.
Line shape:
.........................*
................................*
.................................*
.................................*
................................*
.................................*
.................................*
.................................*
................................*
................................*
................................*
................................*
................................*
................................*
................................*
A line shape is the frequency-response graph of the channel.
A flat vertical line shape is an ideal V.90 line shape. ISDN uses a
64-kb clear channel. No statistical roll off should exist at the low end
or the high end of the spectrum. The spectrum has a Y and X axis.
The Y axis (vertical) represents frequencies from 150 Hz (top of
chart) to
3750 Hz (bottom of chart) in 150 Hz steps. A flat spectrum plot is
best, it is available for V.34, V.90, and K56Flex.
The X axis (horizontal) represents a normal amplitude. The graph
identifies nulls, bandwidth, and distortion (irregular shape).
Table 3-5 Show Modem Operational-Status Field Descriptions (continued)
Parameter Description
Client PC Client modem
33174
NAS
PSTN
+++ enables the client PC
to communicate directly
to the client modem
The connection to
the NAS is still up
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