clock-source {loop-timed | node-timed | differential | free-run}
config>port>tdm>ds3
config>port>tdm>e3
This command specifies the clock source to be used for the link transmit timing.
The clock source setting also determines the node sync reference if the port is configured as one of the node synchronization references (config>system>sync-if-timing>{ref1 | ref2}> source-port command). Refer to the 7705 SAR Basic System Configuration Guide, ‟Node Timing”, for more information.
node-timed (for the 4-port DS3/E3 Adapter card)
loop-timed (for all other applicable adapter cards)
the link recovers the clock from the received data stream
the link uses the internal clock when transmitting data (this parameter does not apply to the 2-port OC3/STM1 Channelized Adapter card)
clocking is derived from a common clock compared to differential clock recovery (DCR) data in the RTP header in the TDM PW overhead. DCR must also be enabled on the relevant card, module, or chassis with the clock-mode command. This parameter applies only to DS3/E3 ports on the 4-port DS3/E3 Adapter card.
timing source is from its own clock, not an external timing source (this parameter does not apply to the 4-port DS3/E3 Adapter card)
crc {16 | 32}
config>port>tdm>ds3
config>port>tdm>e3
This command configures the precision of the cyclic redundancy check (CRC). Non-ATM ports support a 16-bit checksum and ATM ports support a 32-bit checksum. CRC applies to PPP applications only on the 2-port OC3/STM1 Channelized Adapter card and 4-port DS3/E3 Adapter card.
16 (non-ATM ports)
32 (ATM ports)
use 16-bit checksum for the associated port
use 32-bit checksum for the associated port
encap-type {atm | cem | ppp-auto | frame-relay}
no encap-type
config>port>tdm>ds3
config>port>tdm>e3
This command configures the encapsulation method used on the specified DS3/E3 port.
To change the encap-type, the port must first be deleted, then reconfigured with the new encap-type.
no encap-type
specifies the encapsulation type as ATM
specifies the encapsulation type as circuit emulation mode (CEM) for TDM pseudowires
specifies the encapsulation type as PPP. The activation of IPCP and MPLSCP is automatically enabled depending on the protocol configuration. This encapsulation type is only valid on DS3 and E3 ports or DS3 channels in network mode.
specifies the encapsulation type as frame relay
[no] feac-loop-respond
config>port>tdm>ds3
config>port>tdm>e3
This command enables the DS3/E3 interface to respond to remote loop signals. The DS3/E3 far-end alarm and control (FEAC) signal is used to send alarm or status information from the far-end terminal back to the local terminal. DS3/E3 loopbacks at the far-end terminal from the local terminal are initiated.
The no form of this command prevents the DS3/E3 interface from responding to remote loop signals.
no feac-loop-respond
framing {c-bit | m23}
config>port>tdm>ds3
This command specifies DS3 framing for the associated DS3 port.
c-bit
configures the DS3 port for C-bit framing
configures the DS3 port for M23 framing
framing g751
config>port>tdm>e3
This command specifies E3 framing for the associated E3 port.
g751 (this default cannot be changed)
configures the E3 port for g751 framing
idle-cycle-flag {flags | ones}
no idle-cycle-flag
config>port>tdm>ds3
config>port>tdm>e3
This command configures the value that the DS3/E3 interface transmits during idle cycles. This command is applicable only if the encapsulation type is ppp-auto. For ATM ports, the configuration does not apply and only the no form is accepted.
The no form of this command resets the idle cycle flag to the default value.
flags (0x7E)
no idle-cycle-flag (for ATM)
use 0x7E as the idle cycle flag
use 0xFF as the idle cycle flag
loopback {line | internal | remote}
no loopback
config>port>tdm>ds3
config>port>tdm>e3
This command puts the specified DS3/E3 port into a loopback mode.
A line loopback loops frames received on the corresponding port or channel back towards the transmit (egress) direction before reaching the framer.
An internal loopback loops the frames that are coming in an egress direction from the fabric towards the framer, back to the fabric. This is usually referred to as an equipment loopback.
A remote loopback sends a signal to the remote device to provide a line loopback. To configure a remote loopback, you must enable feac-loop-respond on the far-end DS3/E3 interface, then set the loopback to remote on the near-end DS3/E3 interface. Remote loopback sends a loopback code to the far-end DS3/E3 interface that results in the far end sending out a line loopback.
The loopback command is not saved to the system configuration.
The no form of this command disables loopback on the DS3/E3 port.
no loopback
places the associated DS3/E3 port into line loopback mode
places the associated DS3/E3 port into internal loopback mode
places the associated DS3/E3 port into remote loopback mode
mdl {eic | lic | fic | unit | pfi | port | gen} mdl-string
no mdl
config>port>tdm>ds3
This command configures the maintenance data link (MDL) message for a DS3 port or channel. This command is only applicable if the DS3 port or channel is using C-bit framing, specified using the framing (DS3) command.
The no form of this command removes the mdl-string association and stops the transmission of MDL messages.
no mdl
specifies an MDL message up to 38 characters long
specifies the equipment ID code up to 10 characters long
specifies the line ID code up to 11 characters long
specifies the frame ID code up to 10 characters long
specifies the unit ID code up to 6 characters long
specifies the facility ID code up to 38 characters long
specifies the port ID code up to 38 characters long
specifies the generator number to send in the MDL test signal message, up to 38 characters long
[no] mdl-transmit {path | idle-signal | test-signal}
config>port>tdm>ds3
This command enables the transmission of an MDL message on a DS3 port or channel. This command is only applicable if the DS3 port or channel is using C-bit framing, specified using the framing (DS3) command.
The no form of this command prevents the transmission of an MDL message on the DS3 port or channel.
no mdl-transmit
specifies the MDL path message
specifies the MDL idle signal message
specifies the MDL test signal message
mode {access | network}
no mode
config>port>tdm>ds3
config>port>tdm>e3
This command configures a DS3/E3 port for access or network mode of operation.
SAPs can only be configured on access ports. When a DS3/E3 port is configured for access mode, the encap-type can be set to atm, cem, or frame-relay.
A network port is used as an uplink to connect to the packet network and transport the PPP services. Network mode applies to DS3 and E3 ports. When a DS3/E3 port is configured for network mode, the encap-type must be set to ppp-auto.
The mode can be changed between access and network provided that encap-type has not been configured yet. If encap-type has been configured, the DS3/E3 port must be first deleted and then reconfigured with the required encap-type.
The no form of this command reverts to the default.
access
configures the port as service access
configures the port as a network uplink
mtu mtu-bytes
no mtu
config>port>tdm>ds3
config>port>tdm>e3
This command configures the maximum payload MTU size for a DS3/E3 port configured for PPP. Packets that are received larger than the MTU are discarded. Packets that cannot be fragmented at egress and exceed the MTU are also discarded.
The no form of this command restores the default value.
1572 (for ppp-auto)
sets the maximum allowable size of the MTU, expressed as an integer
ppp
config>port>tdm>ds3
config>port>tdm>e3
This command enables access to the context to configure the LCP operational parameters for a DS3/E3 port.
keepalive time-interval [dropcount drop-count]
no keepalive
config>port>tdm>ds3>ppp
config>port>tdm>e3>ppp
This command sets the interval between keepalive messages.
The no form of this command returns the interval to the default value.
keepalive 10 dropcount 3
the time in seconds between keepalive messages, expressed as a decimal integer
the number of consecutive keepalive failed request attempts or remote replies that can be missed before the port becomes operationally down
[no] report-alarm {ais | los | oof | rai | looped}
config>port>tdm>ds3
config>port>tdm>e3
This command enables logging of DS3 and E3 alarms for a DS3/E3 port or channel. When configured, logging is enabled for the raising and clearing of the specified alarms.
The no form of this command disables logging of the specified alarms.
reports alarm indication signal errors
reports loss of signal errors
reports out-of-frame errors
reports remote alarm indication signal errors
reports looped packets errors