MX104 Management and Console Port Specifications and Pinouts
MX104 Clocking and Timing Ports Overview
Four Subminiature B (SMB) connectors (for 10-MHz and 1-PPS), one RJ-48 port (for BITS), and one RS-232 port (for TOD) on the front panel of the router connect to external clock signal sources. The clocking ports provide the synchronized output clocks from any one of the reference clock inputs based on the clock’s priority.
The reference clock inputs can be Ethernet-recovered clocks, T1 or E1 line clocks, IEEE 1588v2-recovered clocks, BITS timing, 10-MHz timing, and 1-PPS timing. The T1 or E1 line clock also supports loop timing. These clocking ports distribute a synchronized clock signal throughout the chassis by locking onto the selected clock source. In the absence of these configured ports, the local oscillator present in the system provides the chassis synchronization.
Clock sources within the MX104 router include:
External clock timing port
10-MHz timing connectors (one input and one output)
1-pulse-per-second (PPS) connectors (one input and one output)
Time-of-day (TOD) RS-232 port
Synchronous Ethernet support on SFP ports as timing input or output
Packet (IEEE 1588-2008) v2 timing includes:
Timing input when configured as Ordinary Clock (OC) or Boundary Clock (BC)
Timing output when configured as BC
See Also
MX104 Routing Engine Ethernet Port Specifications
Cable Specifications
Table 1 lists the specifications for the cables that connect to the ETHERNET port.
Specification |
Value |
---|---|
Cable specification |
Category 5 cable or equivalent suitable for 1000Base-T operation |
Cable/wire supplied |
One 15-ft (4.57-m) length with RJ-45/RJ-45 connectors |
Maximum length |
328 ft (100 m) |
Router receptacle |
RJ-45 autosensing |
Pinouts
The port on the front panel labeled ETHERNET is an autosensing 10/100/1000-Mbps Ethernet RJ-45 receptacle that accepts an Ethernet cable for connecting the Routing Engine to a management LAN (or other device that supports out-of-band management). Table 2 describes the RJ-45 connector pinout.
Pin |
Signal |
Description |
---|---|---|
1 |
TX+_D1 |
Transmit data+ |
2 |
TX–_D1 |
Transmit data– |
3 |
RX+_D2 |
Receive data+ |
4 |
BI+_D3 |
Bidirectional+ |
5 |
BI–_D3 |
Bidirectional– |
6 |
RX–_D2 |
Receive data– |
7 |
BI+_D4 |
Bidirectional+ |
8 |
BI–_D4 |
Bidirectional– |
See Also
MX104 Routing Engine Auxiliary and Console Ports Specifications
The Routing Engine contains two ports labeled AUX and CONSOLE.
The AUX port is not supported.
The ports are asynchronous serial interfaces that accept an RJ-45 connector. The ports connect the Routing Engine to an auxiliary or console management device. Table 4 describes the RJ-45 connector pinout.
Cable Specifications
Table 3 lists the specifications for the cables that connect to console port.
Specification |
Value |
---|---|
Cable specification |
RS-232 (EIA-232) serial cable |
Cable/wire supplied |
One 6-ft (1.83-m) length with RJ-45/DB-9 connectors |
Maximum length |
6 ft (1.83 m) |
Router receptacle |
RJ-45 socket |
Pinouts
Table 4 describes the RJ-45 connector pinout.
Pin |
Signal |
Description |
---|---|---|
1 |
RTS |
Request to Send |
2 |
DTR |
Data Terminal Ready |
3 |
TXD |
Transmit Data |
4 |
Ground |
Signal Ground |
5 |
Ground |
Signal Ground |
6 |
RXD |
Receive Data |
7 |
DSR/DCD |
Data Set Ready |
8 |
CTS |
Clear to Send |
See Also
MX104 Routing Engine USB Port Specifications
The following Juniper Networks USB Flash drives have been tested and are officially supported for the USB port on all MX Series routers:
RE-USB-1G-S
RE-USB-2G-S
RE-USB-4G-S
Any USB memory product not listed as supported for MX Series routers has not been tested by Juniper Networks. The use of any unsupported USB memory product could expose your MX Series router to unpredictable behavior. Juniper Networks Technical Assistance Center (JTAC) can provide only limited support for issues related to unsupported hardware. We strongly recommend that you use only supported USB Flash drives.
All USB Flash drives used on MX Series routers must have the following features:
USB 2.0 or later.
Formatted with a FAT or MS-DOS file system.
See Also
MX104 Alarm Contact Port Specifications
Cable Specifications
Table 5 lists the specifications for the cables that connect to the ALARM port.
Specification |
Value |
---|---|
Cable |
DE-15 alarm cable |
Wire gauge |
Between 20 AWG (0.52 mm2) and 14 AWG (2.08 mm2) |
Router receptacle |
15-pin D-type |
Port Pinouts
You can independently configure alarm input ports (0 to 3) to operate in Normally Open or Normally Closed mode, and to trigger a red alarm condition or a yellow alarm condition, or to ignore alarm conditions.
You can independently configure alarm output ports (0 and 1) to relay alarm information when the system condition goes to a red or yellow alarm condition and when the alarm output port is configured to trigger based on alarm input condition. Alarm output ports (2 and 3) are used to indicate major and minor system alarms and are normally in open mode.
Table 6 shows the alarm contact connector pinouts.
Pin Number |
Signal Definition |
Direction |
CLI Port Mapping |
Function |
---|---|---|---|---|
1 |
ALARM_IN0_NO/NC |
Input |
Input Alarm Port 0 |
External alarm input 0 (if voltage on this pin is between 24V to 72V with reference to Pin 6, alarm input 0 is in closed condition) |
2 |
ALARM_IN1_REF |
Input |
Input Alarm Port 1 |
External alarm input 1 (Reference for Pin 7) |
3 |
ALARM_IN2_NO/NC |
Input |
Input Alarm Port 2 |
External alarm input 2 (if voltage on this pin is between 24V to 72V with reference to Pin 8, alarm input 2 is in closed condition) |
4 |
ALARM_IN3_NO/NC |
Input |
Input Alarm Port 3 |
External alarm input 3 (if voltage on this pin is between 24V to 72V with reference to Pin 8, alarm input 3 is in closed condition) |
5 |
ALARM_OUT3_REF |
Output |
Reserved for Major alarm |
External alarm output 3 (this pin is connected to Pin 10 in closed condition) |
6 |
ALARM_IN0_REF |
Input |
Input Alarm Port 0 |
External alarm input 0 (Reference for Pin 1) |
7 |
ALARM_IN1_NO/NC |
Input |
Input Alarm Port 1 |
External alarm input 1 (if voltage on this pin is between 24V to 72V with reference to Pin 2, alarm input 1 is closed) |
8 |
ALARM_IN2_IN3_REF |
Input |
Input Alarm Port 2 and Input Alarm Port 3 |
Common contact for external alarm input 2 and 3 (Reference for Pin 3 and Pin 4) |
9 |
ALARM_OUT2_REF |
Output |
Reserved for Minor alarm |
External alarm output 2 (this pin is connected to Pin 15 in closed condition) |
10 |
ALARM_OUT3_NO/NC |
Output |
Reserved for Major alarm |
External alarm output 3 (this pin is connected to Pin 5 in closed condition) |
11 |
ALARM_OUT0_NO/NC |
Output |
Output Alarm Port 0 |
External alarm output 0 (this pin is connected to Pin 12 in closed condition) |
12 |
ALARM_OUT0_REF |
Output |
Output Alarm Port 0 |
External alarm output 0 (this pin is connected to Pin 11 in closed condition) |
13 |
ALARM_OUT1_NO/NC |
Output |
Output Alarm Port 1 |
External alarm output 1 (this pin is connected to Pin 14 in closed condition) |
14 |
ALARM_OUT1_REF |
Output |
Output Alarm Port 1 |
External alarm output 1 (this pin is connected to Pin 13 in closed condition) |
15 |
ALARM_OUT2_NO/NC |
Output |
Reserved for Minor alarm |
External alarm output 2 (this pin is connected to Pin 9 in closed condition) |
See Also
MX104 BITS Port Specifications
The external Building-Integrated Timing Supply (BITS) clock interface port labeled EXT REF CLK IN on the front panel of the router allows you to connect external clock signal sources.
Two LEDs indicate link status on the port and function in the same way as the T1/E1 ports. The clocking information is extracted from the input, but the data is discarded.
Cable Specifications
Table 7 lists the specifications for the cables that connect to the EXT REF CLK IN port.

Specification |
Value |
---|---|
Cable |
RJ-48 shielded cable |
Router receptacle |
Autosensing RJ-48 connector |
Port Pinouts
Table 8 provides the pinout information for the RJ-48 connector for the external clocking input port.
Pin |
Description |
Direction |
---|---|---|
1 |
EXT_CLKA_RRING_LINE |
Input |
2 |
EXT_CLKA_RTIP_LINE |
Input |
3 |
Reserved |
– |
4 |
EXT_CLKA_TRING_LINE |
Output |
5 |
EXT_CLKA_TTIP_LINE |
Output |
6 |
Reserved |
– |
7 |
Reserved |
– |
8 |
Reserved |
– |
MX104 1-PPS and 10-MHz GPS Port Specifications
The router contains four ports that support 1-pulse-per-second (PPS) and 10-MHz GPS signals. These signals are internally isolated and have surge protection.
Table 9 lists the specifications for the cables that connect to the 1PPS and 10MHZ input and output ports.
Specification |
Value |
---|---|
Cable specification |
Coaxial |
Router receptacle |
Four SMB input and output connectors |
Connector specification |
Molex 50-ohm SMB (or equivalent) |
Signal support |
10-MHz GPS and 1-pulse-per-second (PPS) |
MX104 Time of Day Port Specifications
A time-of-day (ToD) port on the front panel of the router allows you to connect external timing signal sources. The external timing input port is labeled TOD.
Cable Specifications
Table 10 lists the specifications for the cable that connects to the TOD port.
The output signals are not supported
Specification |
Value |
---|---|
Cable specification |
RS-232 (EIA-232) serial cable |
Cable/wire |
One 6-ft (1.83-m) length with RJ-45 connectors |
Maximum length |
6 ft (1.83 m) |
Connector |
RJ-45 socket |
Port Pinouts
Table 11 provides the pinout information for the RS-232 connector for the ToD port.
Pin |
Description |
Direction |
---|---|---|
1 |
Reserved |
– |
2 |
Reserved |
– |
3 |
Transmit Data |
Output |
4 |
Signal Ground |
– |
5 |
Signal Ground |
– |
6 |
Receive Data |
Input |
7 |
Reserved |
– |
8 |
Reserved |
– |