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
System Administration 
Page 6-47 G2.2 Administration 
6
Field 7
If field  14 is d efined  as non-ISDN (0
, 1
, or 2
) this field  is eq uivalent to the 
Per-Channel Sig naling  and  c ommon c hannel sig naling  op tions used  with System 
85 R2V4. However, the terms have b een c hang ed  to fac ility assoc iated  sig naling  
(FAS) and  NFAS.
If field  14 is d efined  as ISDN (5
), this field  is used  to sp ec ify the method  used  to 
c onstruc t sig naling  b its for eac h DS0 B-c hannel. The 23B +  1D op tion is also 
c alled  FAS. If this interfac e c ontains a D-c hannel (23B +  1D), if it is a DS1/DMI 
link, or if it is an ISDN-PRI link that transmits B-c hannel sig naling  information with 
that p artic ular DS1 link, assig n a 0
 here.
If this fac ility c ontains all ISDN B-c hannels (24B), assig n a 1
 here. The 24B op tion 
is also c alled  NFAS. It is req uired  for those ISDN-PRI links that have their 
B-c hannel sig naling  information transmitted  over a d ifferent ISDN-PRI link. For 
eac h ISDN-PRI fac ility using NFAS, that fac ility must b e translated  as p art of a 
D-c hannel g roup in p roc ed ure 116, word  1. Eac h D-c hannel group  numb er must 
b e assoc iated  with a p artic ular ISDN-PRI fac ility that transmits the sig naling for all 
links within the group. The (23B +  1D) ISDN-PRI equipment location that provides 
this capability is called the 
p rimary D-c hannel. Reliab ility may b e inc reased  b y 
ad ministering  an alternate (23B +  1D) ISDN-PRI eq uip ment loc ation as the 
b ac kup  D-c hannel (as ad ministered  with p roc ed ure 262, word  2).
Field 8
Offers the c hoic e of 24th-c hannel or RBS. The c hoic e of sig naling  method  used  
is d ep end ent on the ap p lic ation. The DS1/DMI-BOS ap p lic ations may b e 
translated  for either op tion. However, non-NFAS ISDN-PRI app lic ations always 
req uire that 24th-c hannel sig naling  b e selec ted . With NFAS, it is p ossib le that no 
D-c hannel exists for this DS1 link.
24th-c hannel sig naling  multip lexes all signaling  information for c hannels 1 
throug h 23 into the 24th c hannel. This makes availab le the full 64K-b p s 
b and wid th (of c hannels 1 throug h 23) for voic e and /or d ig ital d ata transmission.
Field 9
Assig ns the line c od ing  format that will b e used  to forc ib ly ensure that the data 
meets T1-c arrier ones-d ensity requirement. Field  enc od es and  their d esc rip tions 
are:
Zero Code Suppression (ZCS)
Bipolar 8 Zero Code Suppression (B8ZS).
The ZCS line-c od ing  format (restric ted ) sc ans eac h byte for the all-zeroes oc tet 
and , on d etec ting  this b it seq uenc e, sub stitutes a one for the zero in b it p osition 
2. The ZCS format is the most c ommon and  is used  wid ely. The ZCS format c an 
b e used  (without any c onsid eration of the c ommunic ations p rotoc ol) to transmit  
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
System Administration 
Page 6-48 G2.2 Administration 
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7-b it c harac ters/d ata at rates up  throug h 56K-b p s via mod ems and  multip lexers 
that d o b it-stuffing . If the d ata c ommunic ations p rotoc ol is b ased  on the 
hig h-level d ata link (HDLC) p rotoc ol (that is, mod e 2/3) and  d ata is transmitted as 
inverted -HDLC, then the ZCS op tion c an b e used  for d ata rates up  throug h 
64K-b p s. The d ata modules (b oth DCP and  BRI) use the DCP p rotoc ol and BRI 
p rotoc ol resp ec tively. Both DCP and  BRI are based  on the null b ased  DMI 
sp ec ific ation, and  therefore meet these req uirements.
Those DS1/T1 fac ilities that use RBS and  are op tioned  for ZCS maintain the 
ones-d ensity req uirement b y c onverting  all-zero oc tets in the transmit PCM 
stream of eac h c hannel to a string  of seven zeros and  a one. This d oes not 
sig nific antly affec t voic e and  voic eb and  d ata sinc e it is in analog  (PCM) form. For 
DS1/T1 fac ilities that use 24th-c hannel signaling  and  are op tioned  for ZCS, the 
d ata c ommunic ations p rotoc ol/c ommunic ations eq uip ment used  must p revent 
the all-zeroes oc tet from oc c urring ; otherwise, the ZCS method  will forc ib ly alter 
the d ata (c ausing  errors) to g uarantee prop er ones-d ensity.
The B8ZS line-c od ing  format (unrestric ted ) sub stitutes a unique c od e (b ip olar 
violation c od e) for any eig ht c onsec utive zeros. This b ip olar violation c od e is 
d etec ted  at the rec eiving  end  and  c onverted  b ac k to the orig inal string  of eig ht 
zeros. The B8ZS enc od ing  method  permits d ata transmission at rates up  throug h 
64K-b p s without c onsid eration of the p rotoc ol c lear c hannel transmission.
NOTE:
Several d ifferent types of network d igital fac ilities may b e linked  tog ether to 
c omp lete the end-to-end  c onnec tion. Typ ic ally, these will b e 
multiplex-derived  fac ilities. Usually, the multip lexers will contain a b ip olar 
violation monitor and  removal c irc uit that c orrec ts all b ip olar violations 
(alters B8ZS typ e d ata) and  also p rod uc es an all ones if a loss of inp ut 
sig nal oc c urs. This b ip olar violation monitor and  removal feature is c urrently 
an inherent p art of the MX3, M13, MX2, and  M1C multip lexers, as well as 
most vendors multip lexers.
Field 10
This op tion enab les (1
) or disable (0
) c ollec tion of slip  data to sup p ort exc essive 
slip  rate b ased  on switc hing between the p rimary, sec ond ary, or internal 
hig h-ac c urac y c loc ks. The dec ision to switc h from one sourc e to the other is 
normally b ased  on an internal slip  c ount c alc ulation (software rec ord ). However, 
hard ware events (suc h as p rimary link failures) may take p rec ed enc e over any 
software c ontrols.
Slip s are c aused  b y d ifferenc es in c loc k freq uenc ies. A slip  results in the d eletion 
or rep etition of a sing le frame. Slip s are not c aused  b y noise on the line.
Those DS1/T1 sp ans that are used  to p rovid e the p rimary and  sec ond ary 
sync hronization referenc e should  b e ad ministered  for slip  enab le (1
). Sinc e the 
switc h software d oes this automatic ally, this task is not mand atory b ut is a g ood  
p roc ed ure to follow. Typic ally, those other DS1/T1 spans that are used  for d ata 
ap plic ations and  that are deemed  imp ortant should  also b e ad ministered  for slip   
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
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July 1993
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enab le. This exc lud es all T1-sp ans c onnec ting  c hannel b anks, unless the 
c hannel b ank is externally timed . Normally, those DS1/T1 sp ans that are used  
exc lusively for voic e and  that are not assig ned  as the p rimary or sec ond ary 
sync hronization sourc e should  b e ad ministered  for slip  d isab le (0
). The g oal is to 
keep that reference on-line, which minimizes slips for all those DS1s for which 
slip s c ant b e tolerated.
The d ig ital switc h always maintains a slip  c ount rec ord  for eac h DS1. Slip  c ounts 
are c alc ulated  on a 24-hour c ontinuous interval. As a historic al rec ord , the slip 
c ounts for eac h DS1 are maintained  for the last 24 c onsec utive intervals. The slip  
c ount is used  to d etermine if a DS1-sp an is experienc ing  errors and, if so, the 
severity of the errors (typ e alarm).
If the p rimary fac ility uses 24th-c hannel sig naling  and  if the sec ond ary fac ility 
uses RBS, then the p rimary will always b e on-line unless a hardware event forc es 
a switc h to the sec ond ary. A software alg orithm is used  to selec t the fac ility 
(p rimary or sec ond ary) that is on-line for the c ases where:
1. Both p rimary and  sec ond ary fac ilities use the same typ e of signaling  
(either 24th-c hannel or RBS)
2. The p rimary uses rob b ed -b it and  the sec ond ary uses 24th-c hannel 
signaling  
If as many as 50% of those sp ans that are administered  for slip  enab le are 
exp erienc ing  slip s (with resp ec t to the p rimary), then a d ec ision is mad e to 
switc h to the sec ond ary. On switc hing  to the sec ond ary, a software b it is set 
making  the p rimary ap pear as thoug h it has exc eeded  its maximum slip  limit. At 
this p oint, the primary is not evaluated  ag ain for 1 hour.
At the end  of the 1-hour interval, the slip c ount is analyzed . If the p rimary slip 
c ount is less than 2, then a switc h b ac k to the p rimary is mad e. Also, if the 
p rimary has a slip  c ount of 44 or less and  if the sec ond ary and  50% of those 
DS1s that are enabled  for slip  enab le have reac hed their maximum slip  c ount of 
88, then a switc h b ac k to the p rimary is mad e.
Field 11
Offers the op tions external loop  not available (0
) or availab le (1
).
The external loop  availab le op tion should b e selec ted only when d emand  
d iag nostic  maintenanc e is d one and  then only after the interfac e has b een 
b usied  out. This op tion is used  with p roc ed ure 620, test 2, to extend  the rang e of 
the test to inc lud e the network c hannel-terminating eq uipment (NCTE) and  the 
c onnec ting  fac ility (any external eq uip ment to the p oint of the DS1 loop  around ). 
The test req uires that either the c oloc ated  or the distant NCTE b e p hysic ally 
op tioned  for loop bac k mode.
The external loop  availab le op tion should b e used  only for the duration of a test. 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
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Page 6-50 G2.2 Administration 
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Field 12
Sp ec ifies whether (1
) or not (0
) the assoc iated  T1-sp an is used  as an inc oming  
sync hronization sourc e to the switc h. The network sync hronization d iag ram 
should  show those transmission fac ilities that are used  for sync hronization. Eac h 
switc h p ermits a maximum of two interfac es (one p rimary and  one sec ond ary) to 
b e translated  here. However, there is no req uirement to have both.
When a Generic  2 is the master timing server, neither p rimary or sec ond ary is 
administered. Eac h Generic 2 that is equipped with a DS1 will also c ontain a 
TN463 sync hronization c loc k sync hronizer (SC). For sing le-mod ule systems, the 
SC is loc ated  in the mod ule c ontrol c arrier along  with the TN460 mod ule c loc k. 
For multimod ule systems, the SC is loc ated in the TMS c arrier. The SC should  
have p reviously b een assig ned  in p roc ed ure 250.
Field 13
Assig ns whether a DS1 fac ility (translated  in field  12) will b e used  as the p rimary 
or sec ond ary sync hronization sourc e to the switc h. Field  enc od es and  their 
descriptions are:
NOTE:
The p rimary must b e ad ministered  b efore the sec ond ary. The sec ond ary 
must be removed before the primary.
Trad itional mod ules may b e c onfigured  with the ANN11 and /or ANN35 c irc uit 
p ac ks. Only the slot translated  1 (p rimary) and /or the slot translated  2 
(sec ond ary) must be c onfigured  with sync hronization c ab les. These c ab les 
c onnec t the b ac kp lane of the translated  DS1 to the b ac kp lane of the TN463. The 
c ab les are identified  as g roup  334 for interc abinet and  g roup  361 for intrac ab inet 
ap plic ations. When traditional mod ules are translated , field  20 will d isp lay the 
numb er (c od e 99) whic h shows that the switc h c ould  not read  information from 
the DS1 c irc uit p ac k.
Universal mod ules may be c onfig ured  with the TN767 c irc uit p ac k. The 
interc ab inet c able (g roup  503) is req uired  to c onnec t to the TN463 SC, whic h will 
always b e loc ated  in the TMS c ab inet. For universal mod ules, whenever this field  
is translated , field  20 displays a numb er whic h c orrespond s to:
1. Whether the c irc uit p ac k is used  as a sync hronization sourc e
2. If it is a sync hronization sourc e, then whic h type
3. Whic h c able c onnec tor (c ab le 0 or c ab le 1) c ontains the c irc uit pac k 
sync hronization lead s 0 Assig ns that the fac ility is not used  as a sync hronization sourc e
1 Assig ns that the fac ility is the p rimary sync hronization sourc e
2 Assig ns that the fac ility is the sec ondary sync hronization 
sourc e 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
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NOTE:
A loop-timing  p rob lem c an b e c reated  if sync hronization sourc es are not 
ad ministered  c orrec tly. The loop -timing  p roblem exists as the result of an 
error where b oth switc h end p oints (for the same T1-sp an) are ad ministered  
as the p rimary. This c auses the c loc k frequenc y to vary wid ely and  c an 
bring down the switch. Loop-timing problems can be avoided by following 
a c orrec tly eng ineered  network sync hronization d iag ram.
NOTE:
Dep end ing  on the ap p lic ation typ e (enc od e) translated , there may b e 
ad d itional ad ministration, slot, and  p ort g roup ing restric tions.
Field 14
Field encodes and their descriptions are:
0
Assig ns that the DS1/DMI-BOS c hannels c an b e used for b oth trunks 
and  lines (mixed ); the latter is freq uently c alled  off-p remises stations 
(OPS).
.IX Off-p remises--station (OPS)--c hannel assig nments 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
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1
Assig ns that the interfac e is used  to p rovid e DMI-BOS trunks.
The DMI-BOS trunk g roup s are d efined  using  p roc edure 100, word  1 
(enc od e 108 and /or 109). DMI-BOS ap p lic ations use the switc hs DS1 to 
p rovid e a hig h-sp eed  multip lexed  d ata interfac e for c onnec ting to 
c omp atib le c omp uters. The c omp uters may b e loc ated  on the same 
c ustomer p remises as the switc h or many miles away. The 
DS1/T1-c arrier fac ilities are used  b etween the switc h and  remote 
computers.
The DMI-BOS ap p lic ation p rovid es 23 d ata c hannels p lus 1 sig naling  
c hannel. Eac h d ata c hannel c an b e c onsid ered  a 64K-b p s 
c lear-c hannel. However, p ermissib le d ata rates d ep end  on the trunk 
g roup  translations selec ted  in p roc ed ure 100, word  2.
24th-c hannel sig naling  is the only required  servic e/fac ility op tion. All 
others (framing  format and  line c od ing  format) are DMI ap p lic ation 
ind ep endent. However, the d istant c omp uter and  all intermed iate T1 
transmission eq uip ment must b e c omp atib le; refer to the c aution 
reg ard ing  B8ZS line format and  d ata c ommunic ation protoc ols.
The ACCUNET switc hed  d ig ital servic e c an b e p rovid ed  b y setting  up  a 
trunk g roup  with enc od e 109. However, a DS1 must be op tioned  for RBS 
(p roc ed ure 260 field  8). The only other ad ministration req uirement is that 
the trunk g roups translation (field  3 of p roc ed ure 100, word  2) be 
enab led  for 56K-b p s enc od e one.
The trunk g roup used  to p rovide ACCUNET switc hed  d ig ital servic e may 
c ontain as few as 1 or as many as 24 memb ers. Therefore, the same 
DS1 may also b e used to p rovid e CO, FX, WATS, DID, and  Remote 
Access trunks.
2
Assig ns that the DS1 p rovid es 24 lines. These are g enerally c alled  
off-p remises stations (OPS). 
When a DS1 fac ility is used  exc lusively for lines, it must b e ad ministered  
for RBS. Also, the fac ility c annot b e used  as a sync hronization referenc e.
When a DS1 is ad ministered for lines (OPS), it p rovid es 24 c hannels that 
terminate in a remote D4-c hannel b ank, CDM, or their eq uivalent.
Analog  eq uip ment loc ation assignments are ad ministered  by p roc ed ure 
000, word  1, with field  8 translated  to a 2
. The DS1/OPS c hannels are 
translated  to eq uip ment loc ations (ind ivid ual extensions) with p roc edure 
000, word 1, with field  8 translated  to a 9
, rather than with p roc ed ure 116 
that was used  for trunks.
5
Assig ns that the DS1 is used  to p rovid e DMI-MOS or ISDN-PRI trunk 
fac ilities.
When enc od e 5 is ad ministered, p roc ed ure 262 is automatic ally 
translated  with stand ard  d efault op tions. These d efault op tions should  
b e rec hec ked  later for c onsistenc y with the d istant end  (refer to 
p roc edure 262, word  1). 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
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Field 15
Some fac ilities req uire that the c ontents of the D-c hannel b e inverted  to 
g uarantee that the minimum ones density b e maintained  (that is, ZCS line c od ing  
is used ). This field  shows whether the D-c hannel is inverted  or not. Field  enc odes 
and their descriptions are:
Field 16
Field encodes and their descriptions are:
Terminating  fib er c able d irec tly on the DS1/MFAT c arrier or universal mod ule p ort 
c arrier is not c urrently sup p orted . Therefore, this op tion is not ap plic ab le.–
(Dash) not ap p lic ab le or ZCS line c od ing is translated  in field  9. The 
d ash is app rop riate for all ap p lic ations of the ANN11 c irc uit p ac k. RBS 
d oes not use the 24th-c hannel to transmit sig naling information. 
24th-c hannel sig naling  via the BOS interfac e uses A and  B b its for 
sig naling  and  the c hannel struc ture is suc h that the ones-d ensity is 
never violated .
0
Assig ns that the sig naling  information, c ontents of the D-c hannel, is 
inverted .
Either 0 or 1 must be ad ministered  for ISDN-PRI. Rec all that B8ZS is 
rec ommend ed  for ISDN-PRI ap p lic ations. However, not all transmission 
fac ilities will p ermit B8ZS on an end -to-end  basis. Ad ministration must 
b e c oord inated  with the network fac ilities/d istant end  to ensure 
comp atibility.
This field  must b e a dash – when ZCS line c od ing  is selec ted  with ISDN 
and  for automatic  inversion of the D-c hannel.
1
Assig ns that the sig naling  information, c ontents of the D-c hannel, is not 
inverted . Op tion 1
 (no inversion) is strong ly rec ommend ed  for use when 
B8ZS is ad ministered  in field  9.
Wh e n  c o n n e c t e d  t o  a  4 ESS,  y o u  m u s t  in f o r m  t h e  4 ESS o n  t h e  o rd e r f o r m  
whether b its are or are not inverted .
–
(Dash) DS1/DMI-BOS ap p lic ations should  b e administered  with a dash 
(–).
0
Ind ic ates that DMI-MOS/ISDN-PRI ap p lic ations use metallic  c ab le 
fac ilities.
1
Ind ic ates that DMI-MOS/ISDN-PRI ap p lic ations use nonmetallic  c ab le 
fac ilities. 
						

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Field 17
This field  is add ed  to b ring  G2.2 into c omp lianc e with EIA sp ec ific ation PIN-1429.
This EIA sp ec ific ation relates to bit-oriented -sig naling  (BOS); 
messag e-oriented -sig naling  (MOS) is d efined  b y a CCITT sp ec ific ation.
Field encodes and their descriptions are:
Field 18
Loop  leng th refers to the total c ab le d istanc e b etween the switc h and  the NCTE, 
CDM, BCM32000, DSX-1 c ross-c onnec t, and  T1 offic e rep eater. Trad itional 
mod ules may c ontain the ANN11 and /or ANN35 c irc uit p ac ks. Both c irc uit p ac ks 
c ontain DIP switc hes for setting  the c ompensation value. Therefore, software 
ad ministration is not ap p lic ab le and  the –
 should  b e ad ministered  for trad itional 
mod ules.
Universal modules may c ontain the TN767 c irc uit p ac k. Line c omp ensation value 
b e ad ministered  in software. Tab le 6-2
 id entifies the ap p ropriate ad ministration 
enc ode for d istanc e intervals of 133 feet up  to a maximum d istanc e of 655 feet.
Comp ensation values assume 22-g auge ABAM or 24-g aug e PDS c ab les. Two 
switc hes (c oloc ated ) c an b e up  to 1310 feet ap art with maximum c omp ensation –
(Dash) not ap p lic ab le
The d ash is ap prop riate for all ap p lic ations of the ANN35 and  TN767 
c irc uit p ac ks (b oth DMI-MOS and  ISDN-PRI).
0
Ap p ropriate for all ap p lic ations of DS1/DMI-BOS exc ep t when 
c onnec ting to a switc h that uses the Canad ian style of sig naling .
1
Used  when c onnec ting  to a DS1/DMI-BOS that uses the Canad ian style 
sig naling  as sp ec ified  in PN-1429.
Table 6-2. TN767 Compensation Values
Distance to Midpoint or Endpoint (FT) Compensation
22 AWG ABAM & 24 AWG PDS 26 AWG PDS Value
0 to 133 0 to 90 0
133 to 266 90 to 180 1
266 to 399 180 to 270 2
399 to 532 270 to 360 3
532 to 665 360 to 450 4 
						

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on b oth systems. If 26-gaug e PDS c ab les are used , d istanc es are red uc ed  as 
assig ned .
The T1 offic e rep eaters or T1 line rep eaters c an be used  when the on-p remises 
d istanc e limitation is exc eed ed . A T1 offic e rep eater is req uired at eac h end  of 
the c onnec tion to p rovid e an interc onnec tion rang e of up  to 3000 feet. Eac h 
rep eater only p rovid es reg eneration for the rec eive d irec tion. The T1 line 
rep eaters c an b e used  to ac c ommod ate d istanc es up  to 6000 feet between 
switc hes. The T1 line rep eaters c an b e used  in tand em to ac c ommod ate g reater 
d istanc es.
Field 19
Field encodes and their descriptions are:
Field 20
This d isp lay-only field  serves to show whic h c ab les c ontain whic h 
sync hronization c ab les.
Procedure 262 Word 1: Additional
DMI-MOS/ISDN-PRI Facility Options
Proc ed ure 262 is used  to ad minister the ANN35 and  TN767 c irc uit p ac ks.
Fields 1-4
Assig ns the c irc uit p ac k to an eq uip ment loc ation. These inc lud e the mod ule 
numb er, c ab inet number, p ort c arrier numb er, and  slot numb er.
Entries for these four field s are the default values from translating  a 5
 in field 14 of 
p roc ed ure 260. These entries should  always be c orrec t.–
(Dash) req uired op tion for all trad itional mod ules. It is also req uired  for 
all ISDN-PRI links p rovid ed  with universal mod ules.
0
Preferred  for DS1 servic e p rovid ed  with universal mod ules (shows that a 
DS1 p rovid es stand ard  DMI-BOS).
1
Assig ns that the DS1 p rovid es the AT&T prop rietary method  of sig naling  
on the 24th c hannel.
This op tion is req uired  when c onnec tion to System 75 that uses TN722 
circuit packs.
When c onnec ting  to a TN722B or ANN11 c irc uit p ac k, the 
rec ommend ed  op tion is (0
). 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
System Administration 
Page 6-56 G2.2 Administration 
6
Field 5
BRI Only for ISDN-PRI and  DMI-MOS ap p lic ations, the d ash (–) is app rop riate.
Field 6
Assig ns this interfac e as the user (0
) or the network (1
) sid e. When c onnec ted  to 
a  4 ESS,  t h e  c u st o m e r  p re m i se s s w i t c h  is  a l w a y s t h e  u se r  si d e .  Wh e n  n o t  
c o n n e c t e d  t o  a  4 ESS ( t h a t  is ,  w h e n  c o n n e c t e d  t o  a n o t h e r  s w it c h ) ,  o n e  s w it c h  i s  
the user side and the other the network sid e.
For MOS fac ilities (suc h as DMI-MOS and  ISDN-PRI), eac h link must b e 
seg mented  into user and  network sid es. At a Generic  2, eac h MOS-b ased  fac ility 
c onnec ted  to the p ub lic  network is ad ministered  as the user sid e, while other 
c o n n e c t i o n s  ( s u c h  a s  t h a t  t o  a  4 ESS)  a re  a d m i n i st e re d  a s t h e  n e t w o rk  s id e .  Fo r 
p rivate network DMI-MOS and  ISDN-PRI c onnec tions, ad d itional c are must b e 
exercised in defining user and network sides. Specifically at each facility, only 
one end  must b e ad ministered  as the user sid e (0
) while the alternate must be 
d efined  as the network sid e (1
). If the private network node is a tandem switch, 
then that nod e may func tion as b oth user sid e and  network sid e d ep end ing on 
the p artic ular fac ility. Whenever a Generic  2 c onnec ts to a host c omp uter via 
MOS, the c omp uter should  always b e assig ned  as the network sid e.
NOTE:
When a G3V2 DS1/CEPT1 interfac e ad ministered  with a user-network 
p rotoc ol is c onnec ted  to a G2.2 interfac e, the G3V2 interfac e must b e 
administered as network and the G2.2 interfac e as user. This is because 
the user-network administration on the G2.2 is only imp lemented for layer 2. 
The layer 3 user/network relationship  in G2.2 is user b y d efault, whic h 
means the layer 3 user/network identific ation must be network in the G3V2, 
whic h in turn means the layer 2 user/network is also network, whic h in turn 
means the layer 2 user/network on the G2.2 must b e user. If a G3V2 
ad ministered  for the ECMA p eer p rotoc ol is c onnec ted  to a G2.2, you must 
make sure that if the G2.2 is ad ministered as user at layer 2 then the G3V2 
is ad ministered  as p eer-master and  c onversely, as p eer slave if the G2.2 is 
network. The following  tab le shows the rec ommend ed  ways to ad minister 
the user-network and  p eer p rotoc ols when a G2.2 is c onnec ted  to a G3V2:
G2.2
Administered as Layer 2 Layer 3 Administered as Layer 2 Layer 3
user user user network network network
user user user p eer-master/sid e A (G3V2 
only)master side A
network network network p eer-slave/sid e B (G3V2 
only)slave sid e B