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Re: T1 short-haul vs. long-haul
Robert Boyle wrote:
At 08:25 AM 7/21/2004, you wrote:This is one of the "features" of the new WIC-1DSU-T1-V2. It seems that some DSUs can be powered by the telco remotely. In 15 years of working in communications, I've never seen this, but that doesn't mean it isn't used by some remote telco using old style T1 without HDSL or HDSL2 running over the line.o What is "Wet T1 Capable"? What is it used for and who needs this?
I found something on Cisco's website. However this seems only to be relevant for 'long-haul' T1 connection when there is a four-wire going directly to the central office (and possibly through repeaters). http://www.cisco.com/en/US/products/hw/modules/ps2641/products_installation_guide_chapter09186a008007cb6d.html Enabling Wetting Current on the WIC-1DSU-T1-V2 Card The WIC-1DSU-T1-V2 card supports wetting current. Wetting current is a small amount of electrical current (60 to 140 milliamps) sent from the central office to the card to prevent the corrosion of electrical contacts in the card's network connection. Wetting current may be enabled or disabled by the user. It is controlled by the placement of a jumper on connector J2 on the card. Figure5-6 shows the J2 connector and the jumper. The feature is enabled by connecting pins 1 and 2 of the J2 connector with a jumper. It is disabled either by removing the jumper or by connecting pins 2 and 3 of the J2 connector. The card is shipped with the jumper connecting pins 2 and 3 on the J2 connector, which disables the wetting current. -- Andre