Juniper PHYSICAL LAYER - CONFIGURATION GUIDE V11.1.X Configuration Manual page 64

JUNOSe 11.1.x Physical Layer Configuration Guide
show interfaces serial
42
Monitoring Interfaces
Hdlc mru Current size of the maximum receive unit (MRU)
Hdlc mtu Current size of the maximum transmission unit (MTU)
Hdlc interface speed Current line speed of the interface
Ds0 time slot map T1 subchannel
Invert data disabled Status of the data inversion feature
The optional slot and port parameters display information about a specific slot
and port.
Use the slot/port:channel/subchannel option to display information about a specific
interface.
Example
host1#show controllers t3 serial
Serial Interface at 2/0:1/1
ifOperStatus = ifOperLowerLayerDown
snmp trap link-status = disabled
Crc type checking - CRC16
Hdlc mru = 9996
Hdlc mtu = 9996
Hdlc interface speed = 64000
Ds0 time slot map = 0x1
Invert data disabled, Ds0 mode = Nx64
Serial Interface at 2/1:1/1
ifOperStatus = ifOperLowerLayerDown
snmp trap link-status = disabled
Crc type checking - CRC16
Hdlc mru = 9996
Hdlc mtu = 9996
Hdlc interface speed = 64000
Ds0 time slot map = 0x1
Invert data disabled, Ds0 mode = Nx64
Found 2 Serial Interfaces
See show controllers t3.
Use to display information about the serial interfaces you specify.
Field descriptions
Fractional Interface Location of a channelized T1 or E1 interface
Description Text description or alias if configured for the interface
ifOperStatus Administrative status of the interface
ifOperUp Interface is functioning
ifOperTesting Interface is being tested
ifOperNotPresent Module has been removed from the chassis