я исходил из того что "Cost per Line " это оплата по кол-ву строчек (например для журналистов)

(замене) оборудования кабельных модемов



Truck rolls into deployment backlog
After initiating its first cable data services in College Station, Texas, the only cloud on the horizon for TCA was a two- to three-week backlog because of the time it took to roll a truck for each modem installation. At first, installations were handled in the traditional manner by sending out a truck with two technicians who spent two to three hours installing and testing the modem. This time-consuming process limited the pace of the deployment and increased personnel costs. To speed things along, some customers were offered the option of installing the modem themselves. The first few people installed the modems so easily that self-installation soon became the standard, and the truck roll the exception.
http://www.cedmagazine.com/ced/9911/9911c1.htm.

Can I hook up my own purchased modem instead of paying a truck roll charge to have an RCN technician come out?
No. RCN does not offer a self-installation process at this time. A technician must go to the home to install the new modem and pick up the RCN equipment.
http://www.rcn.com/customer/internet2/highspeed_byom.php#10

one-time "truck roll" charge for existing customers to replace rented cable modem with customer's modem [as of 2002-12-09] but many customers have installed their own without being charged
http://users.rcn.com/jdreyer/ipcable/rcnpricing.html.