Testing a Circuit
3- 20
NetTek YBT1E1 T1 & E1 Circuit Tester User Manual
The ANSI T1 standard defines the following loop control formats:
H
In-Band Codes: transmitted in place of payload data (but not
framing bits). These codes are repeated continuously for a period
of 5 seconds and are defined for use with either D4 (Superframe)
or ESF framing formats.
H
Out-of-Band Codes: defined for ESF framing only. An out-of-
band communication link does not exist for D4 framing.
Additionally, there are two types of loop codes:
H
Line Loopback: generates a full 1.5444 Mbps stream looping
back from the receiver to the transmitter, including the framing
bits.
H
Payload Loopback: the equipment performing the loopback
generates the framing, looping back 1.536 Mbps user channel
data only.
The YBT1E1 only supports line loopback codes, in both in-band and
out-of-band loop control formats, as shown in Table 3--1.
Table 3- 1: Defined line loopback codes
Type
In-band/
out-of-band
Up
Down
CSU
CSU In-Band
ESF Line
In-band
Out-of-band
10000
0000 1110 1111 1111
100
0011 1000 1111 1111
NUI
NIU FAC2
NIU FAC1
ESF Net
In-band
In-band
Out-of-band
1100
11000
0001 0010 1111 1111
1110
11100
0010 0100 1111 1111
User
In-band
3- to 8-bit user-entered pattern
Summary of Contents for NetTek YBT1E1
Page 4: ......
Page 8: ...Table of Contents iv NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 12: ...General Safety Summary viii NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 16: ...Preface xii NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 17: ...Getting Started...
Page 18: ......
Page 40: ...Getting Started 1 22 NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 41: ...Operating Basics...
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Page 56: ...Operating Basics 2 14 NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 66: ...The Measurement Results Windows 2 24 NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 67: ...Reference...
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Page 92: ...Testing a Circuit 3 24 NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 93: ...Appendices...
Page 94: ......
Page 100: ...Appendix A Specifications A 6 NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 110: ...Appendix C Diagnostic Self Tests C 4 NetTek YBT1E1 T1 E1 Circuit Tester User Manual...
Page 113: ...Index...
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