R2511-HP MSR Router Series Interface Configuration Guide(V5)

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Step Command Remarks
14. Enable user data reversion.
fe1 data-coding { inverted |
normal }
Optional.
Disabled by default.
15. Set the intended bandwidth
for the E1-F interface.
bandwidth bandwidth-value Optional.
16. Set the physical state change
suppression interval for the
E1-F interface.
link-delay delay-time
Optional.
By default, state change
suppression is disabled.
17. Restore the default settings for
the E1-F interface.
default Optional.
18. Shut down the E1-F interface.
shutdown
Optional.
An E1-F interface is up by default.
19. Start a loop test.
looptest [ -c count | -p { pattern |
special { ascending | descending |
random } } | -s packetsize | -t
timeout ] * interface type number
Optional.
This command is available only on
synchronous serial interfaces
created for E1, T1, E1-F, or T1-F.
Displaying and maintaining E1-F interfaces
Task Command Remarks
Display the configuration and
status of a specified or all E1-F
interfaces.
display fe1 [ serial interface-number ] [ |
{ begin | exclude | include }
regular-expression ]
Available in any view.
Display the status of an E1-F
interface.
display interface serial interface-number [ |
{ begin | exclude | include }
regular-expression ]
Available in any view.
Configuring a T1-F interface
Overview
T1-F interfaces, fractional T1 interfaces, are simplified CT1/PRI interfaces. They are a cost-effective
alternative to CT1/PRI interfaces where T1 access does not need multiple channel sets or ISDN PRI.
Compared with a CT1/PRI interface, a T1-F interface delivers these features:
• In framed mode, it can bind timeslots into only one channel set, but a CT1/PRI interface can group
and bundle timeslots randomly into multiple channel sets.
• It does not support PRI mode.
A T1 line is multiplexed from 24 channels. A T1 primary group frame DS1 (digital signal level-1)
comprises 24 DS0 (64 kbps) timeslots and 1 framing bit for synchronization, with each timeslot being 8
bits. Each primary group frame has 193 bits (24 × 8+1). As DS1 can transmit 8000 frames per second,
its transmission speed is 1544 kbps (193 × 8 kbps).
A T1-F interface can only operate in framed mode. Timeslots 1 through 24 on it can randomly form a
channel set. The rate of the interface is n × 64 kbps or n × 56 kbps and its logical features are the same