> Q. Does the PortMaster 3 have a built-in CSU/DSU?
> A. Yes, it does. The PortMaster 3 has an integrated CSU/DSU capable
> of running T1/E1 speeds.
Correct.
> That information is from the PM3 web page. Would it be possible to find
> out how far the CSU/DSU can be from the exchange? There are several types
> of CSU/DSU, some with ranges of "upto 2 Km", some very definitely much
> longer than that.
Length from the CO isn't really an issue - these are digital lines which can
be cleanly repeated as needed. The "up to 2km" and similar values you've
gotten probably mean that the CSU/DSU itself can do a line build out which
can send the signal that far without a repeater in the circuit. T1/E1 lines
can run 10, 20, hundreds of miles with enough repeaters. (Up to a point I'm
sure, not sure.)
> If the integral CSU/DSU were to be used (I assume it *has* to be
> used?)
Yes, it has to be used.
> then the Telco's responsibility should be to deliver the 4-wire feed into
> the CSU/DSU directly -- is this concept correct?
Yes, well up to the jack which you plug a wire into to go to the PM3.
> If the range of the internal CSU/DSU were to be less than required, is
> there an alternative, external way of handling E1 connectivity?
N/A. See above.
> How many CSU/DSU's are there in the PM3 chassis? If 2xE1 are there
> 2xCSU/DSU ?
Yes, each E1 has its own CSU/DSU unit. The optional T1 WAN card has an
integrated CSU/DSU on it too but there isn't an E1 model (probably because
customers with E1's will usually use all 60 channels available thus all six
slots of modem cards - lucky them).
-- - Steve - Systems Manager - Community Internet Access, Inc. - Gallup and Grants, New Mexico - To unsubscribe, email 'majordomo@livingston.com' with 'unsubscribe portmaster-users' in the body of the message. Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>