Megabit Modem 300S Overview; Determining The Data Rate - ADC MM300S Installation Manual

T M
HE EGABIT
®
The ADC Megabit Modem
over a single-pair copper line to another modem. The modem uses Symmetrical
Digital Subscriber Line (SDSL) technology to support data rates from 128 to
2048 kbps. The data rate is manually set, based on the connection distance and line
condition.
The modem connects through its 10BASE-T port to a PC or Local Area Network
(LAN). The SDSL port provides access to the following type of connection:
connection to another Megabit Modem 300S, which provides access to a remote PC
or small LAN (Figure 1).
Local User
D
ETERMINING THE
The table below shows the best and worst case reach (based on an industry-standard
noise model) on 26 AWG (0.4 mm) and 24 AWG (0.51 mm) wire for each data rate
the Megabit Modem 300S supports. The actual reach depends on the condition of the
line and the presence of bridge taps, splices, line noise, and so on.
128 kbps
26 AWG kft 20/18.5
(best/worst) km 6.10/5.64
24 AWG kft 28.1/26.0
(best/worst) km 8.56/7.92
M 300S
ODEM
®
300S (MM300S) provides a high-speed data connection
300S Modem
Figure 1. Megabit Modem 300S Connection
D
ATA
384 kbps 768 kbps
18.0/13.0 15.5/10.5
5.49/3.96 4.72/3.20
26.0/18.8 21.2/14.3
7.93/5.73 6.45/4.37
300S Modem
SDSL
R
ATE
1024 kbps 1280 kbps
14.0/9.5 13.0/8.5
4.27/2.90 3.96/2.59
18.6/12.7 16.9/11.1
5.68/3.86 5.16/3.38
Remote Network
1536 kbps 1792 kbps
12.5/8.0 11.5/7.0
3.81/2.44 3.51/2.13
16.1/10.3 14.7/8.9
4.90/3.13 4.48/2.73
2048 kbps
10.5/6.5
3.20/1.98
13.4/8.3
4.07/2.52