[c-nsp] 7204 NTP Reference Clock from GPS

[Bob Chan]

Dear all,

Subject added. Sorry for missing subject on first post.
Any suggestion on the reference clock was welcome!

Thanks

Bob Chan

On Sat, Dec 6, 2014 at 9:10 AM, Bob Chan <chanarbob at gmail.com> wrote:

> Dear all,
>
> Do any one using Cisco 7200 as NTP master? and get ref clock from
> Microsemi GPS TOD via Aux port
>
> I used to have a TimeSource3600 to feed TOD to a Cisco7204VXR, but the
> TS3600 was dead, and I install a new TimeSource3550 to do the job.
>
> But I found the 7204 cannot get a reliable PPS from the TS3550, the 7204
> can get TOD for awhile (a few min to an hour) after router boot up, then
> lost sync and said "127.127.6.1 was unreachable"
>
> In TS3550, I set the TOD format to Cisco, and a TOD converter was used to
> change output of TS3550 form RS-422 to RS-232 for the Aux port of Cisco
>
> The 7204 can sync to GPS after a reboot. but after some time (form min. to
> an hour) it will lost sync to GPS and said "Bad Time" or "No PPS signal" in
> sh ntp asso detail" and sh line aux wil indicate alot of "noise" & "overrun"
>
> ==== 7204 ====
>
> ! config
> !
> line aux 0
>  ntp refclock telecom-solutions pps cts stratum 0
>  no exec
>  transport input all
>  stopbits 1
> line vty 0 4
>  exec-timeout 20 0
> !
> ntp access-group query-only 95
> ntp access-group peer 96
> ntp access-group serve 97
> ntp access-group serve-only 98
> ntp master
> !
>
> ! sh ntp ass de
> !
> 127.127.7.1 configured, our_master, sane, valid, stratum 7
> ref ID 127.127.7.1, time D8212701.14C20B50 (12:28:49.081 HKT Thu Nov 27
> 2014)
> our mode active, peer mode passive, our poll intvl 64, peer poll intvl 64
> root delay 0.00 msec, root disp 0.00, reach 377, sync dist 0.015
> delay 0.00 msec, offset 0.0000 msec, dispersion 0.02
> precision 2**18, version 3
> org time D8212701.14C20B50 (12:28:49.081 HKT Thu Nov 27 2014)
> rcv time D8212701.14C20B50 (12:28:49.081 HKT Thu Nov 27 2014)
> xmt time D8212701.14C1C10F (12:28:49.081 HKT Thu Nov 27 2014)
> filtdelay =     0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  0.00
> filtoffset =    0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  0.00
> filterror =     0.02    0.99    1.97    2.94    3.92    4.90    5.87
>  6.85
> Reference clock status:  Running normally
> Timecode:
>
>  --More--         127.127.6.1 configured, insane, invalid, unsynced,
> stratum 0
> ref ID .GPS., time 00000000.00000000 (08:00:00.000 HKT Mon Jan 1 1900)
> our mode active, peer mode unspec, our poll intvl 64, peer poll intvl 64
> root delay 0.00 msec, root disp 0.00, reach 0, sync dist 103.516
> delay 0.00 msec, offset 0.0000 msec, dispersion 16000.00
> precision 2**20, version 3
> org time 00000000.00000000 (08:00:00.000 HKT Mon Jan 1 1900)
> rcv time 00000000.00000000 (08:00:00.000 HKT Mon Jan 1 1900)
> xmt time D8212733.14C1CF13 (12:29:39.081 HKT Thu Nov 27 2014)
> filtdelay =     0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  0.00
> filtoffset =    0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  0.00
> filterror =  16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0
> 16000.0
> Reference clock status:  No PPS signal
> Timecode: *,A,56989,14/11/27,04:29:47,+00.0,0,22N22.238,114E07.820,+0095
>
> ! sh lin aux 0
> !
>    Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns
> Int
> *    1 AUX   9600/9600  -    -      -    -    -      0     581
> 1/799854   -
>
> Line 1, Location: "", Type: ""
> Length: 24 lines, Width: 80 columns
> Baud rate (TX/RX) is 9600/9600, no parity, 1 stopbits, 8 databits
> Status: Ready, Active, Modem Signals Polled
> Capabilities: EXEC Suppressed, NTP Reference Clock, PPS Reference Clock
> Modem state: Ready
> Modem hardware state: CTS* noDSR  DTR RTS
> Special Chars: Escape  Hold  Stop  Start  Disconnect  Activation
>                 ^^x    none   -     -       none
> Timeouts:      Idle EXEC    Idle Session   Modem Answer  Session   Dispatch
>                00:10:00        never                        none     not
> set
>                             Idle Session Disconnect Warning
>                               never
>                             Login-sequence User Response
>                              00:00:30
>                             Autoselect Initial Wait
>                               not set
> Modem type is unknown.
> Session limit is not set.
> Time since activation: never
> Editing is enabled.
> History is enabled, history size is 10.
> DNS resolution in show commands is enabled
> Full user help is disabled
> Allowed input transports are pad v120 telnet.
> Allowed output transports are pad v120 telnet.
> Preferred transport is telnet.
> No output characters are padded
> No special data dispatching characters
> ==== End ====
>
> I had replace the 7204, reboot the TS3550, replace TOD converter and
> related cable.but no luck.
> I try to feed the TOD to a com port of PC and can see the timecode for the
> hyperterminal.
>
> In fact, when I turn debug, I can see the 7204 receive the TOD timecode,
> but I don't know why just refuse to used it.
>
> Any idea?
>
> Thanks in advance for any suggestion.
>
>
>
>