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Cisco 2900 and 3900 Series Hardware Installation
OL-18712-01
Chapter 3      Installing and Connecting the Router
  Connecting WAN, LAN, and Voice Interfaces
Ports and Cabling
Table 3-5 summarizes typical WAN, LAN, and voice connections for Cisco 2900 and Cisco 3900 series 
routers. The connections summarized here are also described in detail in the document on Cisco.com 
Cisco Modular Access Router Cable Specifications
Ta b l e  3-5 WAN, LAN, and Voice Connections
Port or Connection Port Type, Color
1
Connection: Cable
Ethernet RJ-45, yellow Ethernet hub or Ethernet switch Category 5 or higher Ethernet 
T1/E1 WAN 
xCE1T1-PRI
RJ-48C/CA81A 
RJ-48S, tan
T1 or E1 network 
External T1 CSU or other 
T1
 equipment
RJ-48 T1/E1 
RJ-48S to RJ-48S TE 
RJ-48S to RJ-48S NT 
RJ-48S to RJ-48S T1 
RJ-48S to bare 
RJ-48S to BNC 
RJ-48S to twinaxial cable 
RJ-48S to DB-15 
RJ-48S to DB-15 null
T3/DS3/E3 WAN BNC connector T3 network, CSU/DSU, or other 
T3/DS3 equipment
75-ohm coaxial cable
Cisco serial 60-pin D-sub, blue CSU/DSU and serial network or 
equipment
Cisco serial transition cable that 
matches the signaling protocol 
(EIA/TIA-232, EIA/TIA-449, V.35, 
X.21, or EIA-530) 
 
and the serial port operating mode 
(DTE or DCE).
2
 
Cisco Smart serial Cisco Smart compact 
connector, blue
CSU/DSU and serial network or 
equipment
ADSL RJ-11C/CA11A, 
lavender
Network demarcation device for 
service provider DSL interface
RJ-11 straight-through
SHDSL RJ-11C/CA11A, 
lavender, RJ-14
Network demarcation device for 
service provider DSL interface
RJ-11 straight-through for 2-wire 
RJ-14 straight-through for 4-wire
T1/E1 digital voice RJ-48C/CA81A, tan Digital PBX, ISDN network, 
CSU/DSU
RJ-48 T1/E1
Analog voice FXS RJ-11, gray Telephone, fax RJ-11; RJ21 if using NM-HDA, 
straight-through
Analog voice FXO RJ-11, pink Central office, analog PBX
Analog voice E&M RJ-45, brown Analog PBX RJ-45
BRI S/T WAN  
(external NT1)
RJ-45/CB-1D, orange NT1 device or private integrated 
network exchange (PINX)
RJ-45 straight-through
BRI U WAN  
(built-in NT1)
RJ-49C/CA-A11, red ISDN network RJ-48 straight-through
56/64-kbps 
DSU/CSU
8-pin modular, blue RJ-48S interface in subrate device 
or network
RJ-48 straight-through
T1/FT1 DSU/CSU 8-pin modular, blue RJ-48C interface RJ-48 straight-through
Gigabit Ethernet SFP, 
optical
LC, color according 
to optical wavelength
1000BASE-SX, -LX, -LH, -ZX, 
-CWDM
Optical fiber as specified on applicable 
data sheet
Gigabit Ethernet SFP, 
copper
RJ-45 1000BASE-T Category 5, 5e, 6 UTP