Frequency Drift?

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Re: Frequency Drift? jsaad #537519 10/12/12 06:51 PM
Joined: Feb 2011 Posts: 143 Pennsylvania ajkula66 Member
ajkula66 Member Joined: Feb 2011 Posts: 143 Pennsylvania	Originally Posted by jsaad i would inquire with Adtran tech support to see if they have a solution. They are very knowledgeable people and may have some ideas without tossing the Opt11. I guess that you're presuming that the circuit runs on Adtran cards - which may or may not be the case - or am I missing something here? Coming from the telco side of the spectrum, I'd say that OP is reporting way too much trouble for it to be caused by a tiny frequency drift...static, lockouts...I'd be pulling 7-days worth of PMs at least...but that's me. "...Time moves slowly and it goes so fast..." (Sandy Denny)

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Re: Frequency Drift? mj_wald #538182 10/23/12 05:52 PM
Joined: Jul 2005 Posts: 860 O'Fallon, MO CnGRacin Member
CnGRacin Member Joined: Jul 2005 Posts: 860 O'Fallon, MO	Originally Posted by mj_wald When we look at the span it is running 4 hz fast and drifts to 5 hz, then back to 4. The telco tech says this is normal? Doesn't the span need to be exactly 1.544MHz? Not +4 or 5? A T1 does NOT need to be ANYTHING Hertz. ... Thatâ€™s an analog measurement. A T1/DS1 will be 1.544 Megabits per second though. ... Any more, any less, youâ€™ll have a T1 thatâ€™s going hard down. As Just Bill mentioned if what youâ€™re seeing is truly â€œslipsâ€ itâ€™s a clocking problem. What are you sinking off of? Originally Posted by mj_wald The Telco tech the CO clocks off GPS? Oh, best part, the CO is a old Stromberg Carlson! Yes, bits clocks can and do run off satellite links. STROMBERG CARLSON!!?!?! Whoaâ€¦ But is this a PRI weâ€™re talking about? Otherwise the local switcher shouldnâ€™t matter. ----------------------- Bryan LEC Provisioning Engineer Cars -n- Guitars Racin' (retired racer Oct.'07)

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sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's Frequency Drift?