User`s guide

COMSPHERE 3800 Series Modems
2-6 September 1998 3810-A2-GB93-30
To ensure compliance with FCC Part 15 Regulations, a ferrite choke must be installed on the
EIA-232-D and RS-366-A interface cables. See Figure 2-4.
1. Open the ferrite choke and place it around the DTE cable as closely as possible to the
connector attached to the modem.
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.
491-1315
9
CABLE TIES
EIA-232-D
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 2-4. Model 3811 Ferrite Choke Installation