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Configuring WAN Line Services
7-12
117345-B Rev. 00
Setting the MCT1 Line Type
Select one of the following line types (frame formats) for your T1 equipment:
• ESF -- Transmits extended superframes (ESFs), each consisting of 24 SF/D4
frames; provides enhanced signaling and synchronization
For ESF lines, you can also set the facility data link (FDL) mode. See “Setting
the FDL Mode for ESF Line Types” later in this chapter.
• SF/D4 -- Transmits superframes, each consisting of 12 individual frames
For more information on these frame formats, see “Setting the T1 Frame Type” in
Chapter 6
.
See the Line Type parameter on page A-30
for information.
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. Bay 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.)
Set the line coding for this MCT1 interface.
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 1
- WAN Line Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117345-B Rev. 00 10
- About This Guide 19
- Before You Begin 20
- Conventions 20
- Acronyms 21
- Bay Networks Customer Service 24
- How to Get Help 24
- Chapter 1 27
- Getting Started 27
- To edit a circuit: 33
- Figure 1-4. Edit Lines Window 34
- Chapter 2 35
- Setting the BofL Timeout 41
- Setting the MTU 41
- Configuring Clocking Signals 43
- Setting the Signal Mode 45
- Setting Minimum Frame Spacing 49
- Setting the CRC Size 52
- Setting the Signaling Method 54
- Setting the Line Coding 55
- Configuring KG84A Security 55
- Setting the Retry Count 59
- Setting the Link Idle Timer 60
- Setting the Cable Type 61
- Setting the Retry Timer 61
- Setting a Priority 62
- Setting the Hold Down Time 63
- Setting the IFTF Pattern 65
- Chapter 3 77
- Asynchronous Services 77
- for information 78
- Setting the Remote IP Address 79
- Specifying the Remote Port 80
- Specifying the Local Port 80
- Setting the Idle Timer 81
- Chapter 4 83
- Setting the Option Mode 85
- Loopback Test Modes 89
- AN/ANH/ARN 90
- Chapter 5 93
- Enabling or Disabling BofL 96
- Using the BCC 100
- Using Site Manager 100
- Configuring HSSI Services 101
- Chapter 6 103
- Editing T1 Services 104
- Setting the T1 Frame Type 105
- Configuring WAN Line Services 106
- Figure 6-2. Bipolar Format 106
- Specifying Line Buildout 107
- Assigning Channel Functions 108
- Editing E1 Services 109
- Enabling or Disabling CRC 111
- Setting the Clock Source 111
- Chapter 7 113
- Setting the Clock Parameters 116
- Configuring a DS0A Connection 129
- Setting Parameters 131
- Table 7-2 132
- Defining Logical Lines 133
- (MCT1 Example) 134
- Circuit Name: MCE1_31_1 135
- Circuit name: MCE1_231_1 135
- (MCE1 Example) 136
- See the following sections: 137
- Caution: 139
- Assigning Timeslots 144
- About the Tests 149
- Setting Port Test Parameters 150
- Running Port Tests 153
- Running Logical Line Tests 158
- Send Command Function 159
- Chapter 8 161
- Configuring FT1 Services 161
- Configuring an FT1 Port 162
- Defining Logical Line 172
- Circuit name: 174
- Chapter 9 189
- Types of Multiline Circuits 190
- Multiline Example 191
- Software Considerations 192
- Logical Lines (MCE1 Example) 205
- Appendix A 209
- Asynchronous Line Parameters 210
- DSU/CSU Parameters 216
- E1 Line Parameters 218
- HSSI Line Parameters 221
- LAPB Parameters 226
- MCE1 Port Parameters 233
- MCT1 Port Parameters 237
- FT1 Port Parameters 252
- FT1 Logical Line Parameters 258
- Synchronous Line Parameters 263
- T1 Line Parameters 282
- Glossary 287
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