4
HIGH-SPEED SME V.35
The SMEs come with appropiate power supplies. The ME107A and ME108A
models come with UL
®
and CSA listed power supply PS146, which operates
from 115 VAC/60 Hz power. The ME107AE and ME108AE models come
with UL
®
, CSA, and VDE listed power supply PS145E, which operates from
230 VAC/50 Hz power. Both power supplies provide the SME with 17 VAC
center-tapped at 0.7 amps. Their output connectors are indexed to help
prevent incorrect insertion.
The maximum length of cable you can run between the SME and either
of the devices you want to attach to it depends on:
• the cabling standards of the interface that your SME uses.
• the data rate you select (higher data rates often require shorter cable
runs).
• noise sources between the SME and the device (cable run too close to
noise sources will not be able to successfully carry data).
Other concerns not mentioned here might also affect the maximum distance
attainable in your application. For additional information, refer to the
published standards for your SME’s interface, CCITT V.35.
Figure 2-1, below, shows a typical SME application.
Length of Cable;
422 Interface
specified
MAINFRAME
OR MINI
SME-422
REMOTE
CONTROLLER
MINI, OR
MAINFRAME
Figure 2-1. Typical SME Application.
HIGH-SPEED
SME V.35
V.35
