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Configuring MCE1 and MCT1 Services
308648-14.00 Rev 00
7-19
Setting the MCT1 Line Coding
T1 uses bipolar format for signals. In bipolar format, alternating positive and
negative pulses on the digital line signify the number 1, and the absence of a pulse
signifies 0 (see Figure 6-2 in Chapter 6). A long string of zeros would cause the
line to lose synchronization due to lack of pulses. Nortel Networks provides a
line-coding mechanism to maintain synchronization.
By default, the MCT1 interface uses bipolar with 8 zero substitution (B8ZS) line
coding. You can select AMI line coding instead.
B8ZS line coding replaces a block of eight consecutive binary 0s with an 8-bit
B8ZS code. For more information on B8ZS line coding, see “Enabling or
Disabling Bipolar with 8 Zero Substitution (B8ZS)” in Chapter 6.
AMI line coding is also bipolar: a binary 0 is transmitted as zero volts, and a
binary 1 is transmitted as either a positive or negative pulse, opposite in polarity to
the previous pulse. (When configured for AMI line coding, the MCT1 link module
remains synchronized upon receiving up to 45 consecutive zeros.)
Using the BCC
To change the line coding, navigate to the mct1 prompt (for example,
box
;
mct1/1/1
) and type:
port-line-coding
variable
For example:
mct1/1/1#
port-line-coding ami
mct1/1/1#
port-line-coding b8zs
Using Site Manager
See the Line Coding parameter on page A-30 for information.
Note:
If the T1 receive path detects a B8ZS code word when the line is
configured for AMI coding, the router generates a log message and an SNMP
trap.
- Configuring WAN Line 1
- Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308648-14.00 Rev 00 10
- Before You Begin 33
- Text Conventions 34
- Acronyms 35
- Hard-Copy Technical Manuals 38
- How to Get Help 39
- Chapter 1 41
- Getting Started 41
- Accessing Line Parameters 44
- shows where to 46
- Table 1-2. WAN Line Types 47
- Chapter 2 49
- Setting the BofL Timeout 54
- Setting Minimum Frame Spacing 62
- Setting the Signaling Method 67
- Setting the Line Coding 69
- Configuring KG84A Security 69
- LS0017A 70
- Setting the Retry Count 73
- Setting the Link Idle Timer 73
- Setting the Cable Type 74
- Setting the Retry Timer 75
- Setting a Priority 76
- Setting the Hold Down Time 77
- Setting the IFTF Pattern 78
- Resetting EIA Signal Status 91
- Chapter 3 93
- Asynchronous Services 93
- Setting the Baud Rate 96
- Setting the Idle Timer 97
- Chapter 4 99
- Configuring DSU/CSU Services 100
- Site Manager 101
- Setting the Option Mode 102
- Resetting the Router 103
- Configuring Line Availability 104
- Resetting the CQMS Counters 105
- Setting the Poll Rate 105
- Caution: 106
- Using the BCC 107
- Using Site Manager 107
- AN/ANH/ARN 109
- Local Analog Loopback (AL) 110
- Chapter 5 113
- Configuring HSSI Services 113
- Enabling or Disabling BofL 115
- Setting the BofL Interval 116
- Setting the MTU 117
- Setting the CRC Size 119
- Configuring WAN Line Services 122
- Chapter 6 123
- Editing T1 Services 124
- (Figure 6-1) 125
- Setting the T1 Frame Type 126
- Figure 6-2. Bipolar Format 127
- Specifying Line Buildout 128
- Assigning Channel Functions 129
- Editing E1 Services 130
- Enabling or Disabling CRC 132
- Setting the Clock Source 132
- Chapter 7 135
- Setting the Clock Parameters 139
- (continued) 141
- (continued) 142
- Setting the MCE1 Line Type 143
- Setting the MCE1 Line Coding 143
- Setting the Loop Clock 146
- Setting the External Clock 146
- Setting the MCT1 Line Type 152
- Carrier-to-Customer 156
- Setting Relay Control 159
- Configuring a DS0A Connection 164
- Setting Parameters 165
- Defining Logical Lines 169
- Circuit name: MCE1_31_1 171
- E1 CRC MF 187
- Testing MCE1 and MCT1 Lines 190
- Setting Port Test Parameters 191
- Table 7-19. ESF Line Types 194
- Running Port Tests 195
- Running Logical Line Tests 200
- Chapter 8 203
- Configuring FT1 Services 203
- Setting the FT1 Line Type 209
- Setting the FT1 Line Coding 210
- Setting the Signal Level 211
- Type of circuit 225
- Slot where connector 225
- Logical line 225
- Assigning Timeslots 235
- Chapter 9 245
- Configuring FE1 Services 245
- Setting the FE1 Line Type 250
- Setting the FE1 Line Coding 251
- Circuit name: 257
- Testing FE1 Lines 269
- About the Tests 270
- Chapter 10 277
- Types of Multiline Circuits 278
- Multiline Example 279
- Software Considerations 280
- (MCE1 Example) 289
- Logical Lines (MCE1 Example) 291
- Appendix A 295
- Site Manager Parameters 295
- Asynchronous Line Parameters 296
- DSU/CSU Parameters 302
- E1 Line Parameters 304
- HSSI Line Parameters 307
- LAPB Parameters 312
- MCE1 Port Parameters 319
- MCT1 Port Parameters 323
- FT1 Port Parameters 338
- FT1 Logical Line Parameters 344
- FE1 Line Parameters 350
- FE1 Clock Parameters 351
- FE1 Port Parameters 352
- FE1 Logical Line Parameters 357
- Synchronous Line Parameters 363
- T1 Line Parameters 382
- Appendix B 387
- BCC show Commands 387
- <circuit_name> 389
- <slot> 389
- Receive Errors 391
- Transmit Errors 391
- System Errors 393
- <number_of_seconds> 394
- Commands for HSSI Services 411
- E1 framers 431
- Commands for Serial Services 439
- Appendix C 451
- <slot_no.> 452
- Glossary 453
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