Cisco AS5800 Specifications Page 103

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3-21
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 3 Operations
Verifying Modem Performance
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
Parameter #33 PPP/SLIP packets transmitted, received: 0, 0
Parameter #35 PPP/SLIP packets received (BAD/ABORTED): 0
Parameter #36 EC packets transmitted, received OK: 565, 43
Parameter #38 EC packets (Received BAD/ABORTED): 2
Parameter #39 Robbed Bit Signalling (RBS) pattern: 0
Parameter #40 Digital Pad: 6.0 dB, Digital Pad Compensation:None
Line Shape:
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Table 3-5 describes the significant output fields (bold font) in the previous example:
Table 3-5 Show Modem Operational-Status Field Descriptions
Parameter Description
Parameter #6 Total Retrains: 0
Total retrains and speed shifts for the current connection. There are
no retrains.
Parameter #8 Connected Standard: V.90
V.90 modulation is negotiated.
Standard connect protocol which can be V.21, Bell03, V.22, V.22bis,
Bell212, V.23, V.32, V.32bis, V.32terbo, V.34, V.34+, K56Flex, or
V.90.
Parameter #9 TX, RX Bit Rate: 48000, 28800
The transmit speed (TX) is 48000 bps. The receive speed (RX) is
28800 bps.
TX is the bit rate from the local DCE (NAS modem) to the remote
DCE (client modem). RX is the bit rate from the remote DCE to the
local DCE. V.90 uplink speed tends to be lower than V.34 uplink
speed.
Parameter #21 Signal Noise Ratio: 36 dB
The signal to noise ratio (SNR) is 36 dB. (40 dB is a perfect SNR.
MICA measures the SNR in the signal band. The SNR value ranges
from 0 to 70 dB, and it changes in 1 dB steps.
A 28.8 kbps connection requires a SNR of about 37 dB. SNRs lower
than 37 dB reduce the quality of the connection.
A 33.6 kbps connection requires a SNR of about 38 to 39 dB.
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