All MIBs › CASCADE-MIB › dsx1LineCoding
dsx1LineCoding
Module: CASCADE-MIB
OID (symbolic): CASCADE-MIB::dsx1LineCoding
OID (numeric): 1.3.6.1.4.1.277.1.8.1.1.6
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-only
Description: This variable describes the variety of Zero Code Suppression used on the link, which in turn affects a number of its characteristics.
dsx1JBZS refers the Jammed Bit Zero Suppres- sion, in which the AT&T specification of at least one pulse every 8 bit periods is literal- ly implemented by forcing a pulse in bit 8 of each channel. Thus, only seven bits per chan- nel, or 1.344 Mbps, is available for data.
dsx1B8ZS refers to the use of a specified pat- tern of normal bits and bipolar violations which are used to replace a sequence of eight zero bits.
ANSI Clear Channels may use dsx1ZBTSI, or Zero Byte Time Slot Interchange.
E1 links, with or without CRC, use dsx1HDB3 or dsx1AMI.
dsx1AMI refers to a mode wherein no zero code suppression is present and the line encoding does not solve the problem directly. In this application, the higher layer must provide data which meets or exceeds the pulse density re- quirements, such as inverting HDLC data.
What is dsx1LineCoding?
This read-only enumerated value reports the variety of Zero Code Suppression line coding used on this DS1 link, choosing among dsx1JBZS (Jammed Bit Zero Suppression, which sacrifices one bit per channel for signaling, reducing usable per-channel data to 1.344 Mbps), dsx1B8ZS, dsx1HDB3, dsx1ZBTSI, dsx1AMI, or other, each of which affects the link's actual usable bandwidth and error characteristics differently. Getting this wrong relative to what the far-end equipment expects causes bit errors or bipolar violations, so this field is central to diagnosing DS1 framing/coding mismatches. An engineer seeing persistent bipolar violation errors on a DS1 would check dsx1LineCoding to confirm both ends agree on, say, dsx1B8ZS(2) rather than one end still using the older dsx1AMI(5) coding.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.277.1.8.1.1.6 snmpwalk -v2c -c public <target> CASCADE-MIB::dsx1LineCoding
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.277.1.8.1.1.6.1 snmpget -v2c -c public <target> CASCADE-MIB::dsx1LineCoding.1
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OID Breakdown
Upper-level ancestors (6 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.277 | cascade | CASCADE-MIB |
| 1.3.6.1.4.1.277.1 | cascfr | CASCADE-MIB |
| 1.3.6.1.4.1.277.1.8 | ds1 | CASCADE-MIB |
| 1.3.6.1.4.1.277.1.8.1 | dsx1ConfigTable | CASCADE-MIB |
| 1.3.6.1.4.1.277.1.8.1.1 | dsx1ConfigEntry | CASCADE-MIB |
| 1.3.6.1.4.1.277.1.8.1.1.6 | dsx1LineCoding | CASCADE-MIB |