The requirements for a T1 CSU are located in Bellcore TR-TSY-000312 Issue1, March 1988. Section 2.3 will give you the detailed answer your looking for, however the short answer is you do need to provide the DC path. The reason is that midspan repeaters will not function if the path is broken. This Bellcore document tells you everything you need to know about "DS1 interface connectors" (Bellcore's name for T1 smart jacks, T1 CSU's etc) needs to do. Jim
James Wiese Regulatory Compliance Engineer ADTRAN, Inc. 205-963-8431 205-963-8250 FAX [email protected] >---------- >From: Jon D Curtis[SMTP:[email protected]] >Sent: Thursday, December 18, 1997 9:59 AM >To: [email protected] >Subject: BOUNCE [email protected]: Non-member submission from [Dorin >Gheciu <[email protected]>] (fwd) > >From: Dorin Gheciu <[email protected]> >Subject: T1 CSU compliance > > Is anyone aware of a need to provide DC continuity >through T1 CSU's ? > >Before 1989, T1 CSU's used to be powered by access >providers. To accomplish this, the access provider >would send DC current that would loop back via the >center taps of the Tx and Rx transformers of the CSU. > >Although this requirement has been abolished, I was >advised by a colleague to still connect together the >center taps, since some Telco's may expect it, and use >it for "contact wetting". Unfortunately, it complicates >the surge protection of the CSU. > >Thanks, >Dorin Gheciu >Mororola ISG > > > RCIC - http://www.rcic.com > Regulatory Compliance Information Center > > > >
