Cisco 2 Port E3 Serial Port Adapter with E3 DSUs
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1. Serial is up down 1s administratively down Indicates whether the interface hardware is currently active whether carrier detect is present inactive or has been taken down by an administrator line protocol is up down Indicates whether the software processes that handle the line protocol consider the line usable that is whether keepalives are successful or if it has been taken down by an administrator Hardware is Specifies the hardware type Internet address is Specifies the Internet address and subnet mask MTU Maximum Transmission Unit of the interface BW Indicates the value of the bandwidth parameter that has been configured for the interface in kilobits per second The bandwidth parameter is used to compute IGRP metrics only If the interface is attached to a serial line with a line speed that does not match the default 1536 or 1544 for T1 and 56 for a standard synchronous serial line use the bandwidth command to specify the correct line speed for this serial line DLY Delay of the interface in microseconds rely Reliability of the interface as a fraction of 255 255 255 is 100 reliability calculated as an exponential average over 5 minutes load Load on the interface as a fraction of 255 255 255 is completely saturated calculated as an exponential average over 5 minutes Encapsulation Encapsulation method assigned to interface loopback Indica2. rx_soft_overrun_err 0 dump_err 1 tx_underrun_err 0 tx_soft_underrun_err 0 tx_limited 0 tx_fullring 0 tx_started 11504 Framing is g751 Clock Source is Line Bandwidth limit is 34010 Scrambling is enabled National Bit is 0 Internaltional Bits are 0 0 DSU mode 1 Data in current interval 213 seconds elapsed 0 Line Code Violations 0 P bit Coding Violation 0 C bit Coding Violation 0 P bit Err Secs 0 P bit Severely Err Secs 0 Severely Err Framing Secs 0 Unavailable Secs 0 Line Errored Secs 0 C bit Errored Secs 0 C bit Severely Errored Secs Total Data last 24 hours 0 Line Code Violations 0 P bit Coding Violation C bit Coding Violation P bit Err Secs 0 P bit Severely Err Secs Severely Err Framing Secs 0 Unavailable Secs O OO O Line Errored Secs 0 C bit Errored Secs 0 C bit Severely Errored Secs No alarms detected PIO A 639 PIO B 303 Gapper register 50DE Framer register information reg 0 EO reg 1 0 reg 2 0 reg 3 0 reg 4 0 reg 5 8 reg 6 0 reg 7 0 PA E3 and PA 2E3 Serial Port Adapter 15 Command Reference show diag 16 Release 11 1 CA To display hardware information for an interface use the show diag privileged EXEC command on Cisco 7500 series routers show diag slot Syntax Description slot Optional Slot number of the interface Command Mode Privileged EXEC Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA Use this command to determine the type
3. line no clock source Syntax Description internal Specifies that the interface will clock its transmitted data from its internal clock line Specifies that the interface will clock its transmitted data from a clock recovered from the line s receive data stream default Default The line s receive data stream Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 10 3 This command was modified in Cisco IOS Release 11 1 CA to include the E1 G 703 G 704 serial port adapter and PA E3 serial port adapter This command applies to a Cisco 4000 router or Cisco 7000 series Cisco 7200 series and Cisco 7500 series router A G 703 E1 interface PA E3 serial port adapter or E1 G 703 G 704 serial port adapter can clock its transmitted data from either its internal clock or from a clock recovered from the line s receive data stream Example The following example specifies the G 703 E1 interface to clock its transmitted data from its internal clock interface serial 1 0 clock source internal PA E3 and PA 2E3 Serial Port Adapter 5 Command Reference dsu bandwidth 6 Release 11 1 CA To specify the maximum allowable bandwidth used by the PA E3 port adapter use the dsu bandwidth interface configuration command To return to the default bandwidth use the no form of this command dsu bandwidth kbps no dsu bandwidth Syntax Description kbps Maximum bandwidth in
4. match the checksum calculated from the data received On a serial link CRCs usually indicate noise gain hits or other transmission problems on the data link frame Number of packets received incorrectly having a CRC error and a noninteger number of octets On a serial line this is usually the result of noise or other transmission problems overrun Number of times the serial receiver hardware was unable to hand received data to a hardware buffer because the input rate exceeded the receiver s ability to handle the data ignored Number of received packets ignored by the interface because the interface hardware ran low on internal buffers Broadcast storms and bursts of noise can cause the ignored count to be increased abort Illegal sequence of one bits on a serial interface This usually indicates a clocking problem between the serial interface and the data link equipment packets output Total number of messages transmitted by the system bytes output Total number of bytes including data and MAC encapsulation transmitted by the system underruns Number of times that the transmitter has been running faster than the router can handle This might never be reported on some interfaces PA E3 and PA 2E3 Serial Port Adapter 19 Supported MIB Table 2 Show Interfaces Serial Field Descriptions Continued Field Description output errors Sum of all errors that prevented the
5. the range of 22 kbps to 34010 kbps The default is 34010 kbps Default 34010 kbps Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA The local interface configuration must match the remote interface configuration For example if you reduce the maximum bandwidth to 16000 on the local port you must also do the same on the remote port The dsu bandwidth command reduces the bandwidth by padding the E3 frame To verify the data service unit DSU bandwidth configured on the interface use the show controller serial EXEC command Example The following example sets the DSU bandwidth to 16000 kbps on interface 1 0 0 interface serial 1 0 0 dsu bandwidth 16000 Related Command show controllers serial Command Reference dsu mode To specify the interoperability mode used by the PA E3 port adapter use the dsu mode interface configuration command To return to the default mode use the no form of this command dsu mode 01 1 no dsu mode Syntax Description 0 Sets the interoperability mode to 0 This is the default Specify mode 0 to connect the PA E3 port adapter to another PA E3 port adapter or to a Digital Link DSU DL3100 1 Sets the interoperability mode to 1 Specify mode 1 to connect the PA E3 port adapter to a Kentrox DSU Default 0 mode Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Relea
6. OF rxAIS Receive loss of signal loss of frame and alarm indication signal status Values are inactive or active txAIS rxRAI txRAI Transmit alarm indication signal receive remote alarm indicator and transmit remote alarm indicator status Values are inactive or active When the router receives an LOS LOF or AIS the txRAI is active When the remote router receives an LOS LOF or AIS the rxRAI is active Supported MIB The PA E3 port adapter supports a subset of RFC 1407 MIB We support DS3 Near End Group including DS3 E3 Configuration Table DS3 E3 Current Table DS3 E3 Interval Table and DS3 E3 Total Table We do not support DS3 Far End Group and DS3 E3 Fractional Group The PA E3 port adapter also supports the cardTable in the Cisco Chassis MIB and the MIB 2 for each PA E3 interface What to Do Next For more information on the PA E3 serial port adapter refer to the PA E3 Serial Port Adapter Installation and Configuration publication 20 Release 11 1 CA
7. PA E3 and PA 2E3 Serial Port Adapter Description Platforms The PA E3 and PA 2E3 serial port adapters are available on Cisco 7200 series routers on Cisco 7500 series routers and on Cisco 7000 series routers with the 7000 Series Route Switch Processor RSP7000 and 7000 Series Chassis Interface RSP7000CID These port adapters provide one PA E3 or two PA 2E3 high speed full duplex synchronous serial E3 interfaces and integrated data service unit DSU functionality The E3 port adapters can transmit and receive data at E3 rates of up to 34 Mbps and use a 75 ohm coaxial cable available from Cisco to connect to a serial E3 network These port adapters support the following 16 and 32 bit cyclic redundancy checks CRC High speed HDLC data e G751 framing or bypass HDB3 line coding ATM DXI Frame Relay HDLC PPP and SMDS serial encapsulation National service bits E3 MIB RFC 1407 Scrambling and reduced bandwidth Remote and local loopbacks Note For additional information on interoperability guidelines for E3 serial port adapter DSUs refer to the PA E3 Serial Port Adapter Installation and Configuration publication This feature is supported on these platforms Cisco 7200 series Cisco 7500 series Cisco 7000 series routers with the RSP7000 and RSP7000CI PA E3 and PA 2E3 Serial Port Adapter 1 Configuration Tasks Configuration Tasks Perform the tasks in the following
8. SUs The local interface configuration must match the remote interface configuration For example if you enable scrambling on the local port you must also do the same on the remote port To verify that scramble is configured on the interface use the show controllers serial EXEC command Example The following example enables scrambling on the PA E3 port adapter in slot 1 port adapter slot 0 interface 0 interface serial 1 0 0 scramble Related Command show controllers serial PA E3 and PA 2E3 Serial Port Adapter 13 Command Reference show controllers serial 14 Release 11 1 CA Use the show controllers serial privileged EXEC command to display information that is specific to the interface hardware show controllers serial slot port show controllers serial s ot port adapter port Cisco 7500 series and Cisco 7000 series routers with the RSP7000 and RSP7000CI Syntax Description slot Optional Slot number of the interface port Optional Port number on the interface The port value is always 0 port adapter Optional On Cisco 7500 series routers and Cisco 7000 series routers with the RSP7000 and RSP7000CI1 the location of the port adapter on a VIP card The value can be 0 or 1 Command Mode Privileged EXEC Usage Guidelines This command first appeared in Cisco IOS Release 10 0 This command was modified in Cisco IOS Release 11 1 CA to include sample output for the PA E3 port adapter The information
9. by the PA E3 port adapter use the national bit interface configuration command To return to the default E3 national bit use the no form of this command national bit 011 no national bit Syntax Description O11 Specifies the E3 national bit in the G 751 frame The default is 0 Default 0 national bit Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA The national bit command sets Bit 12 in the E3 frame To verify the national bit configured on the interface use the show controller serial EXEC command Example The following example sets the national bit to 1 on the PA E3 port adapter in slot 1 port adapter slot 0 interface 0 interface serial 1 0 0 national bit 1 Related Commands international bit show controllers serial Command Reference scramble To enable scrambling of the payload on the PA E3 port adapter use the scramble interface configuration command To disable scrambling use the no form of this command scramble no scramble Syntax Description This command has no keywords and arguments Default Scrambling is disabled Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA E3 scrambling is used to assist clock recovery on the receiving end Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms by switches placed between the D
10. commendation G 751 Note The ITU T carries out the functions of the former Consultative Committee for International Telegraph and Telephone CCITT 8 Release 11 1 CA When the framing mode is bypass the E3 frame data is not included in the E3 frame just the data To verify the framing mode configured on the interface use the show controller serial EXEC command Example The following example sets the framing mode to bypass on interface 1 0 0 interface serial 1 0 0 framing bypass Related Command show controllers serial Command Reference international bit To set the E3 international bit in the G 751 frame used by the PA E3 port adapter use the international bit interface configuration command To return to the default international bit use the no form of this command international bit 011 011 no international bit Syntax Description 011 Specifies the value of the first international bit in the G 751 frame The default is 0 011 Specifies the value of the second international bit in the G 751 frame The default is 0 Default 0 0 international bit Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA The international bit command sets bits 6 and 8 respectively of set II in the E3 frame To verify the international bit configured on the interface use the show controller serial EXEC command Example The following example sets th
11. displayed is generally useful for diagnostic tasks performed by technical support personnel only For the PA E3 the show controllers serial command also displays configuration information such as the framing clock source bandwidth limit whether scrambling is enabled the national bit the international bits and DSU mode configured on the interface Also displayed is the performance statistics for the current interval and last 15 minute interval and whether any alarms exist Sample Display The following is sample output from the show controllers serial command for a PA E3 serial port installed in slot 2 router show controllers serial 2 0 M1T E3 pa show controller PAS unit 0 subunit 0 f w version 2 55 rev ID 0x2800001 version 2 idb 0x6080D54C ds 0x6080F304 ssb 0x6080F4F4 Clock mux 0x30 ucmd_ctrl 0x0 port _status 0x1 Serial config 0x8 line config 0x1B0202 maxdgram 4474 bufpool 128Kb 256 particles rxLOS inactive rxLOF inactive rxAIS inactive txAIS inactive rxRAI inactive txRAI inactive line state up E3 DTE cable received clockrate 50071882 base0 registers 0x3D000000 basel registers 0x3D002000 Command Reference mxt_ds 0x608BA654 rx ring entries 128 tx ring entries 256 rxring 0x4B01F480 rxr shadow 0x6081081C rx_head 26 txring 0x4B01F960 txr shadow 0x60810E48 tx _head 192 tx_tail 192 tx_count 0 throttled 0 enabled 0 disabled 0 rx_no eop _err 0 rx_no_ stp _err 0 rx_no_eop stp err 0 rx_no_buf 0
12. e international bit to 1 1 on the PA E3 port adapter in slot 1 port adapter slot 0 interface 0 interface serial 1 0 0 international bit 1 1 Related Commands national bit show controllers serial PA E3 and PA 2E3 Serial Port Adapter 9 Command Reference invert data 10 Release 11 1 CA To invert the data stream use the invert data interface configuration command This command applies only to the Cisco 7000 series routers with the RSP7000 and RSP7000CI Cisco 7200 series routers and Cisco 7500 series routers To disable this feature use the no form of this command invert data no invert data Syntax Description This command has no arguments or keywords Default Data is not inverted Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA and Release 11 2 P If the interface on the PA 8T and PA 4T synchronous serial port adapters is used to drive a dedicated T1 line that does not have B8ZS encoding a method to avoid 15 zeros the data stream must be inverted both TXD and RXD either in the connecting CSU DSU or the interface By inverting the HDLC data stream the HDLC zero insertion algorithm becomes a ones insertion algorithm that satisfies the T1 requirements Be careful not to invert data both on the interface and on the CSU DSU as two data inversions will cancel each other out If the interface on the CT3IP uses AMI line coding you must also in
13. er to the show interfaces serial command in the Interface Commands chapter of the Configuration Fundamentals Command Reference Sample Displays The following is sample output from the show interfaces command for a PA E3 serial port adapter installed in chassis slot 2 Router show interfaces serial 2 0 Serial2 0 is up line protocol is up Hardware is M1T E3 pa Internet address is 131 1 1 1 24 MTU 4470 bytes BW 34010 Kbit DLY 200 usec rely 128 255 load 1 255 Encapsulation HDLC loopback not set keepalive not set Last input lw0d output 00 00 48 output hang never Last clearing of show interface counters lw0d Queueing strategy fifo Output queue 0 40 0 drops input queue 0 75 0 drops 5 minute input rate 0 bits sec 0 packets sec 5 minute output rate 0 bits sec 0 packets sec 20 packets input 2080 bytes 0 no buffer Received 0 broadcasts 0 runts 0 giants 0 parity 0 input errors 0 CRC 0 frame 0 overrun 0 ignored 0 abort 11472 packets output 3824748 bytes 0 underruns 0 output errors 0 applique 0 interface resets 0 output buffer failures 0 output buffers swapped out 0 carrier transitions rxLOS inactive rxLOF inactive rxAIS inactive txAIS inactive rxRAI inactive txRAI inactive PA E3 and PA 2E3 Serial Port Adapter 17 Command Reference 18 Release 11 1 CA Table 2 describes significant fields shown in the display Table 2 Show Interfaces Serial Field Descriptions Field Description
14. final transmission of datagrams out of the interface being examined Note that this might not balance with the sum of the enumerated output errors as some datagrams might have more than one error and others might have errors that do not fall into any of the specifically tabulated categories applique Indicates an unrecoverable error has occurred on the E3 applique The router then invokes an interface reset interface resets Number of times an interface has been completely reset This can happen if packets queued for transmission were not sent within several seconds time On a serial line this can be caused by a malfunctioning modem that is not supplying the transmit clock signal or by a cable problem If the system notices that the carrier detect line of a serial interface is up but the line protocol is down it periodically resets the interface in an effort to restart it Interface resets can also occur when an interface is looped back or shut down output buffer failures Number of no resource errors received on the output output buffers swapped out Number of packets swapped to DRAM carrier transitions Number of times the carrier detect signal of a serial interface has changed state For example if data carrier detect DCD goes down and comes up the carrier transition counter will increment two times Indicates modem or line problems if the carrier detect line is changing state often rxLOS rxL
15. framing g751 international bit 00 invert data data is not inverted national bit 0 scramble disabled If you need to change any of the default configuration attributes complete the first task in global configuration mode followed by any of the optional tasks in interface configuration mode Task Command Select the PA E3 interface and enter interface interface serial s ot port adapter port Cisco 7500 configuration mode series and Cisco 7000 series routers with the RSP7000 and RSP7000CD interface serial slot port Cisco 7200 series Change the DSU bandwidth dsu bandwidth kbps Configuration Tasks Task Command Change the DSU mode To connect to another PA E3 port adapter or a Digital Link DSU use the default mode 0 To connect to a Kentrox DSU use mode 1 dsu mode 011 Change the framing used by the interface framing g751 bypass Change the international bit used by the interface international bit 011 011 Invert the data stream on the interface invert data Change the national bit used by the interface national bit 01 1 Enable scrambling on the interface scramble Troubleshoot the PA E3 Port Adapter To set the following loopbacks to troubleshoot the PA E3 port adapter using Cisco IOS software perform the first task beginning in global configuration mode followed by any of the other tasks depending on your needs Task Loopback afte
16. idth by padding the E3 frame the dsu mode command enables and improves interoperability with other DSUs and the national bit command sets Bit 12 in the E3 frame to 1 router configure terminal router config interface serial 1 0 0 router config if ip address 1 1 1 10 255 255 255 0 router config if clock source internal router config if cre 32 router config if dsu bandwidth 16000 router config if dsu mode 0 router config if national bit 1 router config if no scramble router config if framing g751 router config if no shutdown router config if exit router config exit router Command Reference This section documents new or modified commands All other commands used with this feature are documented in the Cisco IOS Release 11 1 command references clock source interface dsu bandwidth dsu mode framing international bit invert data loopback national bit scramble show controllers serial show diag show interfaces serial 4 Release 11 1 CA Command Reference clock source interface To control which clock a G 703 E1 interface an E1 G 703 G 704 serial port adapter or a PA E3 serial port adapter will use to clock its transmitted data from use the clock source interface configuration command To restore the default value use the no form of this command clock source internal
17. n of traffic per second during a given 5 minute period These rates are exponentially weighted averages with a time constant of 5 minutes A period of four time constants must pass before the average will be within two percent of the instantaneous rate of a uniform stream of traffic over that period packets input Total number of error free packets received by the system bytes input Total number of bytes including data and MAC encapsulation in the error free packets received by the system no buffers Number of received packets discarded because there was no buffer space in the main system Compare with ignored count Broadcast storms on Ethernets and bursts of noise on serial lines are often responsible for no input buffer events Received broadcasts Total number of broadcast or multicast packets received by the interface runts Number of packets that are discarded because they are smaller than the medium s minimum packet size giants Number of packets that are discarded because they exceed the medium s maximum packet size parity Number of the parity errors on the interface input error Total number of no buffer runts giants CRCs frame overrun ignored and abort counts Other input related errors can also increment the count so that this sum might not balance with the other counts CRC Cyclic redundancy checksum generated by the originating station or far end device does not
18. of port adapter installed on a VIP2 in your router Sample Display The following is sample output from the show diag command for a PA E3 serial port adapter in chassis slot 2 byron show diag 2 Slot 2 E3 PA port adapter 1 port Port adapter is analyzed Port adapter insertion time 1w0d ago Hardware revision 0 1 Board revision A0 Serial number 4509983 Part number 73 2620 02 Test history 0x0 RMA number 00 00 00 EEPROM format version 0 EEPROM contents hex 0x20 00 71 00 01 00 44 D1 1F 49 OA 3C 02 00 00 00 00 0x30 01 00 00 00 97 06 12 00 FF FF FF FF FF FF FF FF Command Reference show interfaces serial To display information about a serial interface use the show interfaces serial privileged EXEC command show interfaces serial slot port Cisco 7200 series show interfaces serial slot port adapter port Cisco 7500 series and Cisco 7000 series with the RSP7000 and RSP7000CI Syntax Description slot Optional Slot number of the interface port Optional Port number on the interface The port value is always 0 port adapter Optional On Cisco 7500 series routers and Cisco 7000 series routers with the RSP7000 and RSP7000CI the location of the port adapter on a VIP card The value can be 0 or 1 Command Mode Privileged EXEC Usage Guidelines This command was modified in Cisco IOS Release 11 1 CA to include sample output for the PA E3 serial port adapter For additional command syntax and sample displays ref
19. r the LIU toward the terminal Command loopback dte Loopback after going through the framer toward the terminal loopback local Loopback toward the network before going through the framer loopback network line Loopback toward the network after going through the framer loopback network payload These loopback commands loop all packets from the E3 interface back to the interface and also direct the packets to the network Monitor and Maintain the PA E3 Port Adapter After configuring the new interface you can display its status To show current status of the E3 interface on the PA E3 port adapter perform any of the following tasks in EXEC mode Task Command Display statistics for the E3 interface show interfaces serial slot port adapter port Cisco 7500 series and Cisco 7000 series routers with the RSP7000 and RSP7000CI show interfaces serial slot port Cisco 7200 series Display the configuration information for the E3 interface show controllers serial slot port adapter port Cisco 7500 series and Cisco 7000 series routers with the RSP7000 and RSP7000CI show controllers serial slot port Cisco 7200 series PA E3 and PA 2E3 Serial Port Adapter 3 Configuration Example Configuration Example The following example shows a typical configuration for serial interface 1 0 0 on a PA E3 serial port adapter in a Cisco 7500 series router The dsu bandwidth command reduces the bandw
20. se 11 1 CA The local interface configuration must match the remote interface configuration For example if you define the data service unit DSU interoperability mode as on the local port you must also do the same on the remote port You must know what type of DSU is connected to the remote port to determine if it interoperates with the PA E3 port adapter Use mode 0 to connect a PA E3 port adapter to another PA E3 port adapter or to a Digital Link DSU DL3100 Use mode 1 to connect a PA E3 port adapter to a Kentrox DSU The dsu mode command enables and improves interoperability with other DSUs To verify the DSU mode configured on the interface use the show controller serial EXEC command Example The following example sets the DSU mode to 1 on interface 1 0 0 interface serial 1 0 0 dsu mode 1 Related Command show controllers serial PA E3 and PA 2E3 Serial Port Adapter 7 Command Reference framing To specify E3 line framing used by the PA E3 port adapter use the framing interface configuration command To return to the default G 751 framing use the no form of this command framing bypass g751 no framing Syntax Description bypass Specifies bypass E3 framing g751 Specifies G 751 E3 framing This is the default Default G 751 framing Command Mode Interface configuration Usage Guidelines This command first appeared in Cisco IOS Release 11 1 CA The default framing is described in the ITU T Re
21. sections to configure the PA E3 all tasks are optional except for the first task Configure the PA E3 Port Adapter Troubleshoot the PA E3 Port Adapter Monitor and Maintain the PA E3 Port Adapter For PA E3 port adapter configuration examples see the Configuration Example section later in this chapter The PA E3 supports most interface commands For information about these commands refer to the Configuring Interfaces chapter of the Configuration Fundamentals Configuration Guide For additional information on how to configure the PA E3 serial port adapter refer to the Configure a Synchronous Serial Interface section in the Configuring Interfaces chapter of the Configuration Fundamentals Configuration Guide For information on other commands that can be used by the PA E3 serial port adapter refer to the Cisco IOS Release 11 1 configuration guides Configure the PA E3 Port Adapter 2 Release 11 1 CA In addition to the commands in the Configure a Synchronous Serial Interface section in the Configuring Interfaces chapter of the Configuration Fundamentals Configuration Guide the commands listed in Table 1 have been added to support the PA E3 interface configuration If you do not modify the configuration of the PA E3 the configuration defaults shown in Table 1 are used Table 1 PA E3 Port Adapter Defaults Command Default Value dsu bandwidth 34010 kbps dsu mode 0
22. tes whether loopback is set or not keepalive Indicates whether keepalives are set or not Last input Number of hours minutes and seconds since the last packet was successfully received by an interface Useful for knowing when a dead interface failed Last output Number of hours minutes and seconds since the last packet was successfully transmitted by an interface output hang Number of hours minutes and seconds or never since the interface was last reset because of a transmission that took too long When the number of hours in any of the last fields exceeds 24 hours the number of days and hours is printed If that field overflows asterisks are printed Last clearing of show interface counters Time the counters were last cleared Queueing strategy First in first out queuing strategy other queueing strategies you might see are priority list custom list and weighted fair Output queue drops input queue drops Number of packets in output and input queues Each number is followed by a slash the maximum size of the queue and the number of packets dropped due to a full queue Command Reference Table 2 Show Interfaces Serial Field Descriptions Continued Field Description 5 minute input rate 5 minute output rate Average number of bits and packets transmitted per second in the last 5 minutes The 5 minute input and output rates should be used only as an approximatio
23. vert the data on the T1 channel For more information see the t1 linecode controller configuration command Example The following example inverts data on serial interface 3 1 0 interface serial 3 1 0 invert data Command Reference loopback To loop the serial interface on a PA E3 port adapter use the loopback interface configuration command To remove the loopback use the no form of this command loopback dte local network line payload no loopback Syntax Description dte local network line payload Default Disabled Command Mode Interface configuration Usage Guidelines Sets the loopback after the LIU toward the terminal Sets the loopback after going through the framer toward the terminal Sets the loopback toward the network before going through the framer line or after going through the framer payload This command first appeared in Cisco IOS Release 11 1 CA Use this command for troubleshooting purposes To verify that a loopback is configured on the interface use the show interface serial or show interfaces loopback EXEC command Example The following example configures the serial interface located in slot 3 0 0 for a local loopback interface serial 3 0 0 loopback local Related Command show interfaces serial PA E3 and PA 2E3 Serial Port Adapter 11 Command Reference national bit 12 Release 11 1 CA To set the E3 national bit in the G 751 frame used
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