1
3810-A2–GZ42-20
December 1999
FERRITE CHOKE, PART NUMBER 175-0018-0031
Installation Instructions
Document Number 3810-A2-GZ42-20
December 1999
OVERVIEW
Two ferrite chokes and cable ties are shipped with every Model 3811 modem. To ensure compliance with FCC
Part 15 Regulations, a ferrite coke must be installed on both the EIA-232-D interface cable and the RS-366-A
interface cable.
INSTALLATION
Use Figure 1 and the following procedures to install the ferrite chokes and cable ties on to the DTE interface
cables.
1. Open the ferrite choke and place it around one of the DTE cables as close as possible to the DTE
connector attached to the rear connector plate.
2. Close the two halves around the cable and snap the ferrite choke shut, pressing down on the plastic latch
to secure it.
3. Install a cable tie behind the ferrite choke to prevent it from sliding along the cable.
4. If a second DTE cable is attached to the rear connector plate, repeat Steps 1–3.
00-13159-01
CABLE TIES
EIA-232-D
DTE
CONNECTOR
DIAL NETWORK
INTERFACE MODULE
(SLOTS 1 – 8)
ALARM E1 & E2
LEASED INTERFACE
(SLOTS 1 – 8)
FUTURE USE
POWER
CONNECTORS
FUSES
AC
POWER
LEASED
INTERFACE
(SLOTS 9 – 16)
FUTURE USE
DIAL
NETWORK
INTERFACE
MODULE
(SLOTS 9 – 16)
EIA-232/V.24
INTERFACE
RS-366-A/V.25
INTERFACE
FERRITE
CHOKE
REAR
CONNECTOR
PLATES
RS-366-A
DTE
CONNECTOR
Figure 1. Ferrite Choke Installation
