BRX-VDSL2 User Guide
9
180-0153-001-R02
It should be noted that the Downstream and Upstream Bandwidth Performances above (both in the
graphs and in the table) are conservative as they are based on tests performed with traffic on the
other pairs of the cable binder (i.e. with crosstalk) and with otherwise typical copper line conditions.
Field experience has shown that the BRX-VDSL2 devices provide even better Improvement Ratios
(i.e. Bandwidth Enhancement)
when faced with “less than ideal” line conditions where the bandwidth
is negatively impacted by bridge taps, influence from power lines and/or disturbances from other
pairs or the use of other protocols in the same binder such as T1/E1, HDSL, and G.SHDSL.
3.2
BRX-VDSL2 Placement Flexibility
Over and above the performance gains, one of the major advantages of the BRX-VDSL2 devices
over other products is that their placement along the loop is flexible and does not impose hard
constraints when choosing the location where they should be installed. For instance, on a 24 AWG
(0.51mm) loop of 6000 feet / 1.8 km, placing the BRX-VDSL2 anywhere between 3000 feet / 0.9 km
and 3750 feet / 1.15 km (2750 feet / 0.84 km and 3750 feet / 1.15 km) away from the DSLAM will
deliver a 25 / 4 Mbps service to the customer. The BRX-VDSL2-X will typically provide higher
performance in both the downstream and upstream when compared to the BRX-VDSL2 version.
Figure 3: Downstream Placement flexibility of BRX-VDSL2 on a 6000 feet loop
