02-04-2002 12:53 AM - edited 03-01-2019 08:20 PM
hello all, I have a 3620 with a MICA mard with PRI ISDN access.
Using debugs I've notived that each call has an average time to go thru the router of 150 ms. This looks to be due to speed negotiation for the modems.
Is there a way to improve this time ? What would be the inpact of having a fixed speed ?
Many thanks, Alex
02-04-2002 09:52 PM
What version of mica firmware are you running(sh modem ver)? If you are not running 2.7.3.0 you should upgrade. If you have a modemcap applied what is it(sh run | inc modemcap)? Get a "sh modem op x/y" for a bad connection(x/y=slot/port). What kind of client modems are there, and can you get the firmware rev's they are on?
First check your "sh controller t1/e1" for errors.
Josh
02-05-2002 03:02 AM
hello Josh, thanks for your reply.
No modem cap,
version is 2.7.3.0
but what i was wrong was on the problme description: in fact now I wonder if I could decrease the following time: analogue client - FE of the 3620.
Reply from 10.69.1.35: bytes=32 time=150ms TTL=255
Reply from 10.69.1.35: bytes=32 time=191ms TTL=255
Reply from 10.69.1.35: bytes=32 time=230ms TTL=255
Reply from 10.69.1.35: bytes=32 time=161ms TTL=255
in this case the client has connected with the following, but most of them I'm not sure I can understand.
3620NAS1#sh mod op 0/25
Modem (0/25) Operational Status:
Parameter #0 Disconnect Reason Info: (0x0)
Type (=0 ):
Class (=0 ): Other
Reason (=0 ): no disconnect has yet occurred
Parameter #1 Connect Protocol: LAP-M
Parameter #2 Compression: V.42bis both
Parameter #3 EC Retransmission Count: 60
Parameter #4 Self Test Error Count: 0
Parameter #5 Call Timer: 76 secs
Parameter #6 Total Retrains: 0
Parameter #7 Sq Value: 3
Parameter #8 Connected Standard: V.90
Parameter #9 TX,RX Bit Rate: 48000, 31200
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: 25, 1
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: 40 dB
Parameter #22 Receive Level: -17 dBm
Parameter #23 Frequency Offset: -1 Hz
Parameter #24 Phase Jitter Frequency: 0 Hz
Parameter #25 Phase Jitter Level: 0 degrees
Parameter #26 Far End Echo Level: -31 dBm
Parameter #27 Phase Roll: 0 degrees
Parameter #28 Round Trip Delay: 20 msecs
Parameter #30 Characters transmitted, received: 5577, 3885
Parameter #32 General Portware Information: 0
Parameter #33 PPP/SLIP packets transmitted, received: 66, 78
Parameter #35 PPP/SLIP packets received (BAD/ABORTED): 0
Parameter #36 EC packets transmitted, received OK: 147, 157
Parameter #38 Moving Average of EC packets (Received BAD/ABORTED): 0
Parameter #39 Robbed Bit Signalling (RBS) pattern: 0
Parameter #40 Digital Pad: None
Digital Pad Compensation : Enabled
Parameter #42 SS7/COT Status: 0
Parameter #43 V110/PIAFS frames received bad: 0
Parameter #44 V110/PIAFS frames received good: 0
Parameter #45 V110/PIAFS frames transmitted: 0
Parameter #46 V110/PIAFS sync lost: 0
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Is there a way to decrease these 150 seconds ?
many thanks, Alex
02-06-2002 10:03 PM
Looks like a pretty good connection to me. What is your processor running at(sh proc cpu)? What switching path are you using for your async connections(sh ip int asyncX)? Do your users complain of slow connections? Can you run some ttcp tests and provide figures for those:
http://www.cisco.com/warp/public/471/ttcp.html
Josh
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