How do I convert my RFL 9745 analog

teleprotection equipment to operate over

T1 leased digital lines?

via UtilitiesSolutions_US-012_10-03-14.pdf.

The Scenario: Telephone companies will no longer support audio leased lines starting as early as 2015. This presents an issue for utilities currently operating their RFL
9745 equipment with an analog communications interface. In some scenarios, full or fractional T1 leased digital data service lines are available for a nominal monthly fee. Utilities are looking for a path forward that minimizes operational impact, requires little engineering, and assures comparable security
& dependability for their protection signalling.

The Solution: For point-to-point teleprotection applications, RFL offers a complete digital DDS upgrade kit that allows
the customer to replace the 9745 analog interface
with a digital interface module set. The RS-449
digital interface cables directly into a Channel
Service Unit / Digital Service Unit, which in turn
plugs directly into a full or fractional T1 line. This
layout is mirrored on the remote end teleprotection