Lucent Technologies DEFINITY Communications System Generic 2.2 And Generic 3 V2 DS1/CEPT1/ISDN PRI Reference Manual

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-17 Channel Structure and Signaling 
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Notes:
1. CO is any of the following  trunk types: CO, FX, and  WATS.
2. Tie is any of the following trunk typ es: ac c ess, tie, tand em, RLT, ap lt.
3. If CAS is used  on a CO trunk typ e, the c ountry p rotoc ol must b e c orrec t for 
that c ountry.
4. The TN767 c annot b e used  for ISDN PRI sig naling  on a G3rV2. It...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-18 Line Coding 
4
Line Coding
Line c oding  is the pattern that d ata assumes as it is prop ag ated  over a 
c ommunic ations c hannel. Dig ital trunks on DEFINITY systems use the following  
line cod ing s:
nAlternate Mark Inversion (G3 V2 only, CEPT1 interfac es only)
nAlternate Mark Inversion with Zero Cod e Sup p ression (all systems, DS1 
interfac es...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-19 Line Coding 
4
Figure 4-3. Alternating Mark Inversion
Alternating Mark Inversion Line Coding
All transmissions g enerated b y d ig ital trunk ports are enc od ed  in AMI. AMI was 
d esig ned  to fill the line rep eater’s need  for d ep end ab le and rec urring  voltag e 
c hanges on the line. With AMI, every 1 in the transmission stream c hang es the 
line...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-20 Line Coding 
4
c od ing  sub stitutes a p red etermined  b it string  for every g roup  of eig ht 
c onsec utive zeros that it find s in the transmission stream. The p red etermined  
sub stitute string  c ontains intentional b ip olar p ulse violations so that it c an b e 
rec ognized  at the rec eiving  end . Thus, unlike with ZCS, B8ZS line c od ing  will...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-21 Line Coding 
4
1. 100V if there has b een an even numb er of 1s sinc e the last substitution. V 
means a b ip olar violation. For examp le, if the last 1 was a + , the V would  
be a +.
2. 000V if there has b een an od d  numb er of 1s sinc e the last sub stitution.
To illustrate HDB3, c onsid er the following  string :
Input bit stream      1011   0000   01...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-22 Line Coding 
4
ac hieved . Mod e 3 d ata is restric ted  if it is inverted b ec ause it is p ac kag ed  in an 
un-inverted LAPD protocol.
NOTE:
The terms restric ted  d ata and  unrestric ted data are c onfusing  b ec ause 
restric ted  d ata is d ata that c an b e transp orted over any fac ility and  is thus 
less restric ted  (in an intuitive sense) than...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-23 Line Coding 
4
Notes:
1. The mod e-2 hand shake will not work over other than 64-kb p s fac ilities (for 
example, robbed-bit facilities). 
2. Other MPDMs are the High Speed  Sync hronous MPDM and the Vid eo 
Teleconferenc ing  MPDM. The only difference b etween them is that the Vid eo 
Teleconferenc ing  MPDM has an RS-366 interfac e for keyb oard  dialing...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-24 Line Coding 
4
4. Mod e-3 d ata c an only b e c irc uit-switched in Generic  2.2 and  G3V2 systems. Also, 
mod e 3 on the 3270 A and 3270 T req uires a 3270 C on the far-end .
5. Mod e 2 on the PC/PBX c onnec tion is supp orted  und er the ASCII terminal 
emulation p ac kag e. The PC/PBX c onnec tion in mode 2 uses a mod e-3/2 ad ap tive 
hand shake if the b...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-25 Line Compensation 
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NOTE:
It is rec ommend ed  that the D c hannel not b e inverted  if B8ZS is 
ad ministered .
G2.2 Line Coding Implementation
G2.2 imp lements line c od ing  in p roc ed ure 260, word1, field 9. This 
ad ministration is req uired for all DS1-b ased  trunk b oard s, inc luding  those in the 
universal mod ule. You c an c hoose either B8ZS...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-26 Idle Code 
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The value entered  into the Line Compensation
 field  of this form should  b e set 
to the leng th of the c ab le from the DS1/CEPT1 c irc uit p ac k to the CSU. If the 
c ab le is c onnec ted  to another DS1/CEPT1 interfac e that also p erforms line 
c omp ensation, the value should  b e set to one half the leng th of the c ab le.
Idle Code...