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