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Specification
DBM (Backup) connector
(reserved for future use)
Clocking Sources
Loopbacks
Standard
Additional
Pin Assignments
NET Port/Interface
Function
Receive ring from the network
Receive tip from the network
Transmit ring to the network
Transmit tip to the network
COM Port/Interface
Signal
DCE Transmit Clock ( TXC )
DCE Receive Data ( RXD )
Signal Ground ( SG )
DCE Transmit Data ( TXD )
DCE Data Terminal Ready ( DTR )
DCE Carrier Detect ( CD )
DCE Request to Send ( RTS )
DCE Receive Clock ( RXC )
Criteria
One 8-position modular keyed USOC RJ45 jack
T1 network interface, any port, internal clock, DSX-1
T1 interface or external clock
Network Line Loopback, Network Payload
Loopback, V.54 Loop 2 (DCLB) and V.54 Loop 3
(DTPLB)
Network Repeater Loopback, DSX-1 Line Loopback
DSX-1 Payload Loopback, DSX-1 Repeater
Loopback, DTE Loopback
Circuit
R1
T1
R
T
Direction
Out
Out
—
In
In
Out
In
Out
13
Pin #
1
2
4
5
Pin #
1
2
3
4
5
6
7
8
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