User`s guide

2-1
8000-A2-GB21-10
June 1997
Customer Domain Features
2
Overview
This chapter describes the following features that are supported in the customer
domain:
 Data Rates
 Protocols
 Address Resolution Protocol (ARP) with Proxy ARP
 Filtering
Data Rates
The HotWire DSL card employs Rate Adaptive Digital Subscriber Line (RADSL)
devices based on Carrierless Amplitude & Phase (CAP) technology. The RADSL
speed is asymmetric. This means that the downstream rate (from the DSLAM to
the RTU) is faster than the upstream rate (from the RTU to the DSLAM).
You can manually set the speed (providing the line you are using can support the
specified speed) or set the speed to auto-select. The HotWire DSLAM determines
the line speed during the initial handshaking session between the DSLAM and
the RTU based on the loop length, the amount of noise on the loop, and the
user-configurable upper and lower speed limits.
The following are the maximum upstream and downstream data rates with
standard #24 AWG wiring, and 24 ISDN disturbers in the same 25-pair binder
group:
 Maximum upstream data rate: 1088 kbps (remote access from the customer
premises to the CO up to a distance of 13,400 feet)
 Maximum downstream data rate: 2560 kbps (remote access from the
customer premises to the CO up to a distance of 15,600 feet)