|
|
This chapter explains the function and syntax of the interface commands loopback remote through service-module t1 remote-loopback. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS Interface Command Reference, Release 12.1.
To loop packets through a CSU/DSU, over a DS-3 link or a channelized T1 link, to the remote CSU/DSU and back, use the loopback remote interface configuration command. To remove the loopback, use the no form of this command.
FT1/T1 CSU/DSU Modules
loopback remote {full | payload | smart-jack} [0in1 | 1in1 | 1in2 | 1in5 | 1in8 | 3in24 | qrw | user-pattern 24bit-binary-value]
no loopback remote {full | payload | smart-jack}
2- and 4-Wire, 56/64-kbps CSU/DSU Modules
loopback remote [2047 | 511 | stress-pattern pattern-number]
no loopback remote
Syntax Description
full Transmit a full-bandwidth line loopback request to a remote device, which is used for testing. payload Transmits a payload line loopback request to a remote device, which is used for testing the line and remote DSU. smart-jack Transmits a loopback request to the remote smart-jack, which some service providers attach on the line before the customer premises equipment (CPE). You cannot put the local smart-jack into loopback. 0in1 (Optional) Transmits an all-zeros test pattern used for verifying B8ZS line encoding. The remote end my report a loss of signal when using alternate mark inversion (AMI) line coding. 1in1 (Optional) Transmits an all-ones test pattern used for signal power measurements. 1in2 (Optional) Transmits an alternating ones and zeros test pattern used for testing bridge taps. 1in5 (Optional) Transmits the industry standard test-pattern loopback request. 1in8 (Optional) Transmits a test pattern used for stressing timing recovery of repeaters. 3in24 (Optional) Transmits a test pattern used for testing the ones density tolerance on AMI lines. qrw (Optional) Transmits a quasi-random word test pattern, which is a random signal that simulates user data. user-pattern 24bit-binary-value (Optional) Transmits a test pattern that you define. Enter a binary string up to 24 bits long. For the fixed patterns such 0in1 and 1in1, the T1 framing bits are jammed on top of the test pattern; for the user-pattern, the pattern is simply repeated in the timeslots. 2047 (Optional) Transmits a pseudo-random test pattern that repeats after 2047 bits. 511 (Optional) Transmits a pseudo-random test pattern that repeats after 511 bits. stress-pattern pattern-number (Optional) Transmits a DDS stress pattern available only on the 4-wire 56/64-kbps CSU/DSU module. You may enter a stress pattern from 1 to 4. A 1 pattern sends 100 bytes of all 1s and then 100 bytes of all 0s to test the stress clocking of the network. A 2 pattern sends 100 bytes of a 0x7e pattern then 100 bytes of all 0s. A 3 pattern sends continuous bytes of a 0x46 pattern. A 4 pattern sends continuous bytes of 0x02 pattern.
To configure the Maintenance Data Link (MDL) message defined in the ANSI T1.107a-1990 specification for the CT3 in a Cisco AS5800 universal access server, or for the CT3IP in Cisco 7500 series routers, use the mdl interface configuration command. To remove the message, use the no form of this command.
mdl {transmit {path | idle-signal | test-signal} | string {eic | lic | fic | unit | pfi | port | generator} string}
Syntax Description
transmit path Enables transmission of the MDL Path message. transmit idle-signal Enables transmission of the MDL Idle Signal message. transmit test-signal Enables transmission of the MDL Test Signal message. string eic string Specifies the Equipment Identification Code; can be up to 10 characters. string lic string Specifies the Location Identification Code; can be up to 11 characters. string fic string Specifies the Frame Identification Code; can be up to 10 characters. string unit string Specifies the Unit Identification Code; can be up to 6 characters. string pfi string Specifies the Facility Identification Code sent in the MDL Path message; can be up to 38 characters. string port string Specifies the Port number string sent in the MDL Idle Signal message; can be up to 38 characters. string generator string Specifies the Generator number string sent in the MDL Test Signal message; can be up to 38 characters.
To specify the physical connection on an interface, use the media-type interface configuration command. To restore the default value, use the no form of this command.
media-type {aui | 10baset | 100baset | mii}
Syntax Description
aui Selects a 15-pin physical connection. This is the default on Cisco 4000 series routers. 10baset Selects an R-J45 10BaseT physical connection. 100baset Specifies an RJ-45 100BaseT physical connection. This is the default on Cisco 7000 series and Cisco 7200 series routers. mii Specifies a media-independent interface.
The half-duplex command replaces this command.
To enable an interface to support the Maintenance Operation Protocol (MOP), use the mop enabled interface configuration command. To disable MOP on an interface, use the no form of this command.
mop enabledSyntax Description
This command has no arguments or keywords.
To enable an interface to send out periodic Maintenance Operation Protocol (MOP) system identification messages, use the mop sysid interface configuration command. To disable MOP message support on an interface, use the no form of this command.
mop sysidSyntax Description
This command has no arguments or keywords.
To adjust the maximum packet size or maximum transmission unit (MTU) size, use the mtu interface configuration command. To restore the MTU value to its original default value, use the no form of this command.
mtu bytes
Syntax Description
bytes Desired size in bytes.
To set the E3 national bit in the G.751 frame used 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 {0 | 1}
Syntax Description
0 | 1 Specifies the E3 national bit in the G.751 frame. The default is 0.
Syntax Description
mark (Optional) Specifies that NRZI mark encoding is required on the PA-8T and PA-4T+ synchronous serial port adapters on Cisco 7200 and 7500 series routers. If mark is not specified, NRZI space encoding is used.
To specify the mode of a slow-speed serial interface on a router as either synchronous or asynchronous, use the physical-layer interface configuration command. To return the interface to the default mode of synchronous, use the no form of this command.
physical-layer {sync | async}
Syntax Description
sync Places the interface in synchronous mode. This is the default. async Places the interface in asynchronous mode.
To enable an interface on a PA-4R-DTR port adapter to operate as a concentrator port, use the port interface configuration command. To restore the default station mode, use the no form of this command.
portSyntax Description
This command has no arguments or keywords.
To send the line alarm indication signal (LAIS) when the POS interface is placed in any administrative shut down state, use the pos ais-shut interface configuration command.
pos ais-shutSyntax Description
This command has no arguments or keywords.
To set the SONET overhead bytes in the frame header to meet a specific standards requirement or to ensure interoperability with another vendor's equipment, use the pos flag interface configuration command. To remove the setting of the SONET overhead bytes, use the no form of this command.
pos flag {c2 | j0 | s1s0} value
Syntax Description
c2 value Path signal identifier used to identify the payload content type. The default value is 0xCF. j0 value Section trace byte (formerly the C1 byte). For interoperability with SDH equipment in Japan, use the value 0x1. The byte value can be 0 to 255. sls0 value S1 and S0 bits (bits 5 and 6 of the H1 #1 payload pointer byte). Use the following values to tell the SONET transmission equipment the SS bit: The S1 and S0 bits can be 0 to 3. Values 1 and 3 are undefined. The default value is 0.
To specify the framing used on the POS (Packet-over-SONET) interface, use the pos framing interface configuration command. To return to the default SONET STS-3c framing mode, use the no form of this command.
pos framing {sdh | sonet}
Syntax Description
sdh Selects SDH STM-1 framing. This framing mode is typically used in Europe. sonet Selects SONET STS-3c framing. This is the default.
The pos framing command replaces this command.
The clock source (interface) command replaces this command. Refer to the description of clock source command for information on transmit clock source.
To permit selected SONET alarms to be logged to the console for a POS interface, use the pos report interface configuration command. To disable logging of select SONET alarms, use the no form of this command.
pos report {b1-tca | b2-tca | b3-tca | lais | lrdi | pais | plop | prdi | rdool | sd-ber | sf-ber | slof | slos}
Syntax Description
b1-tca Reports B1 bit-error rate (BER) threshold crossing alarm (TCA) errors. b2-tca Reports B2 BER crossing TCA errors. b3-tca Reports B3 BER crossing TCA errors. lais Reports line alarm indication signal errors. lrdi Reports line remote defect indication errors. pais Reports path alarm indication signal errors. plop Reports path loss of pointer errors. prdi Reports path remote defect indication errors. rdool Reports receive data out of lock errors. sd-ber Reports signal degradation BER errors. sf-ber Reports signal failure BER errors. slof Reports section loss of frame errors. slos Reports section los of signal errors.
To enable SONET payload scrambling on a POS interface, use the pos scramble-atm interface configuration command. To disable scrambling, use the no form of this command.
pos scramble-atmSyntax Description
This command has no arguments or keywords.
To set the BER threshold values of the specified alarms for a POS interface, use the pos threshold interface configuration command. To return to the default setting, use the no form of this command.
pos threshold {b1-tca | b2-tca | b3-tca | sd-ber | sf-ber} rate
Syntax Description
b1-tca B1 bit-error rate (BER) threshold crossing alarm. The default is 6. b2-tca B2 BER threshold crossing alarm. The default is 6. b3-tca B3 BER threshold crossing alarm. The default is 6. sd-ber Signal degrade BER threshold. sf-ber Signal failure BER threshold. The default is 3 (10e-3). rate Bit-error rate from 3 to 9 (10-n).
The pos framing command replaces this command.
To specify ISDN Primary Rate Interface (PRI) on a channelized E1 or T1 card on Cisco 7500 series router, use the pri-group controller configuration command. To remove the ISDN PRI, use the no form of this command.
pri-group [timeslots range]
Syntax Description
timeslots range (Optional) Specifies a single range of values from 1 to 23.
To enable pulsing DTR signal intervals on the serial interfaces, use the pulse-time interface configuration command. To restore the default interval, use the no form of this command.
pulse-time seconds
Syntax Description
seconds Integer that specifies the DTR signal interval in seconds. The default is 0.
To set the ring speed for the CSC-1R and CSC-2R Token Ring interfaces, use the ring-speed interface configuration command.
ring-speed speed
Syntax Description
speed Integer that specifies the ring speed, either 4 for 4-Mbps or 16 for 16-Mbps operation. The default is 16.
To enable scrambling of the payload on the PA-E3 port adapter and the PA-T3 port adapter, use the scramble interface configuration command. To disable scrambling, use the no form of this command.
scrambleSyntax Description
This command has no arguments or keywords.
The half-duplex timer command replaces this command.
The half-duplex command replaces this command.
The half-duplex timer command replaces this command.
To configure the network line speed for a serial interface on a 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k clock rate interface configuration command. To enable a network line speed of 56 kbps, which is the default, use the no form of this command.
service-module 56k clock rate speed
Syntax Description
speed Network line speed in kbps. The default speed is 56 kbps. Choose from one of the following optional speeds:
To set up the clock source on a serial interface for a 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k clock source interface configuration command. To specify the clocking come from line, use the no form of this command.
service-module 56k clock source {line | internal}
Syntax Description
line Uses the clocking provided by the active line coming in to the router. This is the default. internal Uses the internal clocking provided by the hardware module.
To prevent application data from replicating loopback codes when operating at 64 kbps on a 4-wire CSU/DSU, use the service-module 56k data-coding interface configuration command. To enable normal transmission, use the no form of this command.
service-module 56k data-coding {normal | scrambled}
Syntax Description
normal Specifies normal transmission of data. This is the default. scrambled Scrambles bit codes or user data before transmission. All control codes such as out-of-service and out-of-frame are avoided.
To transmit packets in switched dial-up mode or digital data service (DDS) mode using a serial interface on a 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k network-type interface configuration command. To transmit from a dedicated leased line in DDS mode, use the no form of this command.
service-module 56k network-type {dds | switched}
Syntax Description
dds Transmits packets in DDS mode or through a dedicated leased line. The default is DDS enabled for the 4-wire CSU/DSU. switched Transmits packets in switched dial-up mode. On a 2-wire, switched 56-kbps CSU/DSU module, this is the default and only setting.
To enable the acceptance of a remote loopback request on a serial interface on a 2- or 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k remote-loopback interface configuration command. To disable the module from entering loopback, use the no form of this command.
service-module 56k remote-loopbackSyntax Description
This command has no arguments or keywords.
To select a service provider to use with a 2- or 4-wire, 56/64-kbps dial-up serial line, use the service-module 56k switched-carrier interface configuration command. To enable the default service provider, use the no form of this command.
service-module 56k switched-carrier {att | sprint | other}
Syntax Description
att AT&T or other digital network service provider. This is the default on the 4-wire, 56/64-kbps CSU/DSU module. sprint Sprint or other service provider whose network requires echo cancelers. This is the default on the 2-wire, switched 56-kbps CSU/DSU module. other Any other service provider.
To specify the clock source for the fractional T1/T1 CSU/DSU module, use the service-module t1 clock source interface configuration command. To return to the default line clock, use the no form of this command.
service-module t1 clock source {internal | line}
Syntax Description
internal Specifies the CSU/DSU internal clock. line Specifies the line clock. This is the default.
To guarantee the ones density requirement on an AMI line using the fractional T1/T1 module, use the service-module t1 data-coding inverted interface configuration command. To enable normal data transmission, use the no form of this command.
service-module t1 data-coding {inverted | normal}
Syntax Description
inverted Inverts bit codes by changing all 1 bits into 0 bits and all 0 bits into 1 bits. normal Requests that no bit codes be inverted before transmission. This is the default.
To set the FDL parameter to either ATT or ANSI, use the service-module t1 fdl interface configuration command. To ignore the FDL parameter, use the no form of this command.
service-module t1 fdl {ansi | att}
Syntax Description
ansi Sets the FDL parameter to ANSI. att Sets the FDL parameter to ATT.
To select the frame type for a line using the fractional T1/T1 (FT1/T1) module, use the service-module t1 framing interface configuration command. To revert to the default, Extended Super Frame, use the no form of this command.
service-module t1 framing {esf | sf}
Syntax Description
esf Specifies Extended Super Frame as the T1 frame type. This is the default. sf Specifies D4 Super Frame as the T1 frame type.
To configure the CSU line-build-out (LBO) on a fractional T1/T1 CSU/DSU module, use the service-module t1 lbo interface configuration command. To disable line-build-out, use the no form of this command.
service-module t1 lbo {-15 db | -7.5 db | none}
Syntax Description
-15 db Decreases outgoing signal strength by 15 dB. -7.5 db Decreases outgoing signal strength by 7.5 dB. none Transmits packets without decreasing outgoing signal strength.
To select the line code for the fractional T1/T1 module, use the service-module t1 linecode interface configuration command. To select the default, the B8ZS line code, use the no form of this command.
service-module t1 linecode {ami | b8zs}
Syntax Description
ami Specifies alternate mark inversion (AMI) as the line code. b8zs Specifies binary 8 zero substitution (B8ZS) as the line code. This is the default.
To generate remote alarms (yellow alarms) at the local CSU/DSU or detect remote alarms sent from the remote CSU/DSU, use the service-module t1 remote-alarm-enable interface configuration command. To disable remote alarms, use the no form of this command.
service-module t1 remote-alarm-enableSyntax Description
This command has no arguments or keywords.
To specify if the fractional T1/T1 CSU/DSU module enters loopback mode when it receives a loopback code on the line, use the service-module t1 remote-loopback interface configuration command. To disable remote loopbacks, use the no form of this command.
service-module t1 remote-loopback {full | payload} [alternate | v54]
Syntax Description
full Configures the remote loopback code used to transmit or accept CSU loopback requests. This is the default, along with payload. payload Configures the loopback code used by the local CSU/DSU to generate or detect payload-loopback commands. This is the default, along with full. alternate (Optional) Transmits a remote CSU/DSU loopback request using a 4-in-5 pattern for loopup and 2-in-3 pattern for loopdown. This is an inverted version of the standard loopcode request. v54 (Optional) Industry standard loopback code. Use this configuration for CSU/DSUs that may not support the Accunet loopup standards. This keyword is used only with a payload request, not a full request.
Posted: Wed Jul 26 12:56:12 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.