Cisco Explorer 4700, Hardware Installation And Maintenance Manual

Page: 42 / 143

2-20 Cisco 4000 Series Hardware Installation and Maintenance
Network Connection Considerations
Figure 2-20 Dual Serial Network Processor Module Ports
Two LED daughter cards are attached to the front of the dual serial module. (See Figure 2-21.)
Figure 2-21 Dual Serial Network Processor Module—Top View
Caution Hold the dual serial network processor module carefully by its handle or by the module’s
edge. To prevent damage from stress or from ESD, do not exert force against the two LED daughter
cards, and do not touch the components on the cards.
Configuring the Dual Serial Module Interfaces
The dual serial network processor module contains two jumpers, J4 and J5 (see Figure 2-21), which
determine whether the ports are configured for nonreturn to zero (NRZ) or nonreturn to zero inverted
(NRZI). J4 configures serial port 0, and J5 configures serial port 1. The factory-configured (default)
jumper setting is for NRZ. To configure for NRZI mode on each port, the jumper must connect pins
1 and 2 of the respective jumper locations. (See Figure 2-22.) For NRZ (not NRZI), the jumpers that
connect pins 2 and 3 can be removed.
50-Pin
serial ports
LEDs
(4 green)
LEDs
(4 green)
LEDs
(1 yellow,
1 green)
Alignment
groove
Alignment
groove
H1484a
DO
SERIAL (V2)
PORT-1
PORT-0
TXC
DI
RXC
DCD
RS
TS1
TS2
LP
DCE
P-0 P-1
LED daughter cards
Serial
ports
H1036a
Module handle
Mounting
screw location
LEDs
Port 1 Port 0
J5 J4
Indicates port 0
Indicates port 1