ATT Definity Addendum 1 For Ds1, Dmi, Isdn Pri Instructions Manual

							6. PORT TYPES/INSTALLATION COMPATIBILITIES
This chapter describes the operating modes, installation compatibilities, and port types supported by
DS1s. Because of differences between Generic 1 and Generic 2 software and hardware, appropriate
distinctions are identified and separate sections provided.
To date, DS1s have been well accepted. For both Generic 1 and Generic 2, DS1s were initially available
for providing digital tie trunks. Later versions of DS1s and later releases and versions of the switch
software provide additional capabilities. These later version circuit packs are always backward
compatible with previous types.
However, new capabilities that depend on software may only be available on the earlier releases when
the required software is provided, whether the software is a patch or later issue of the tape. Not all new
capabilities are backward compatible to earlier releases and versions. Table 6-1, Supported Digital
Facilities, lists the available capabilities and the hardware and software dependencies.
Engineering problems are minimized by having a good understanding of:
lDSl/DMI, and ISDN-PRI capabilities
lHardware and software compatibility requirements
lServices that the particular application requires
lAll carrier facilities that will be used to complete the end-to-end transmission facility (both local
exchange company (LEC) and toll network carrier)
lThe labeled network diagram
Installation problems are minimized by proceeding from a labeled network diagram. Each DS1 or all
intermediate transmission equipment, such as channel-expansion multiplexers (CEMs), channel-division
multiplexers (CDMs), network channel-terminating equipment (NCTE), network carrier multiplexers,
channel banks, or channel units, should be verified for compatibility. Verification includes a review of
the administration options and, where appropriate, the option-switch settings.
Each end of the channel must be fully compatible For example, if at one end channel 1 is used as a tie
trunk, then channel 1 at the distant end must also be used as a tie trunk. Or, if a group of channels (for
example, 1-16) are administered for call-by-call (CBC) use at one end, then the same group of channels
must also be used for call by call. If, at one switch, extended super framing (ESF), 24th-channel½
½
signaling, and the zero code suppression (ZCS) line-code format are optioned, then the distant end must
be administered or optioned likewise.½
6-1
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							6-2PORT TYPES/INSTALLATION COMPATIBILITIES
CAUTION
The 551V channel service units will only function with the ZCS line-code format. They
will not pass B8ZS bipolar violations. If the B8ZS line-code format is used for copper
carrier facilities, then the 551V ST (or equivalent) NCTE should be installed and optioned
accordingly.½
½
½
½
The CDMs are T1 multiplexers that provide an economical means to independently access any of the 24
channels from a DS1 or T1 facility. This access means is called per-channel drop and insert capability.
One line-interface unit, the CDM DS1, connects to the compatible equipment (such as, a Generic 1,
Generic 2, CEM, or D4-channel bank). The other line-interface unit connects to the NCTE and T1
facility.½
Dedicated data applications, both point-to-point and multipoint, can be connected to the CDM and
inserted in selected channels. At the receive end, particular channels may be dropped from a DS1 or T1
facility by another CDM, or routed through a dedicated switch connection (DSC) as required.
TABLE 6-1. Supported Digital Facilities
DS1/DMI/ISDN-PRI Circuit-Pack Suffix Compatibility Matrix
Signaling
TypeSystem 85 R2 and G2System 75 R1 and G1½
½
Switch
VersionTN380ANN11
(Note 1)ANN35TN555
(G2 Only)TN767
(G2 Only)Switch
VersionTN722TN767
E&M
SignalingV1-V4,G2B,C,D
(Note 2)B,C,D,E
(Notes 2&3)N/AN/Aall
V2,V3,G1allall
Ground Start
(CO, FX, WATS, RA,
Plus DID)V1-V4,G2
(Note 4)
C,D
C,D,E
N/AN/AallG1
N/Aall
(Note 5)½
½
Loop Start
(CO, FX, WATS, RA)V3,V4,G2C,DC,D,EN/A
N/AallG1
N/Aall
(Note 5)½
½
OPS Line (Note 6)
V3,V4,G2C,D
C,D,E
N/AN/Aall
G1N/A
all
DMI-BOS (Note 3)
V3,V4,G2C,D
D,EN/A
N/Aall
V2,V3,G1B
all
DSC (analog data)V3,V4,G2
(Note 7)C,D
C,D,Eall
N/A
allN/A
N/A
N/A½
DMI-MOS and ISDN
(Note 8)V4,G2DN/A
allN/A
(Note 9)all
G1N/Aall½
ProprietaryV1-V4,G2B,C,D
(Note 2)C,D,E
N/A
N/Aall
V2,V3,G1all
all
NOTES:
1.The ANN11E and ANN11C have similar functions with one exception: the ANN11E supports the DMI-BOS 24th-
channel-signaling format and the ANN11C does not. The DMI-BOS format was added in addition to the proprietary
24th-channel and robbed-bit formats supported by ANN11C. The applications of these formats are summarized below
in a feature comparison. The ANN11C and ANN11E are compatible with respect to all other options not listed in this
table (including robbed-bit (RB) signaling, D4/ESF framing, and ZCS/B8ZS line coding).
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							PORT TYPES/INSTALLATION COMPATIBILITIES6-3
SIG. TYPE ANN11 REQAPPLICATIONS SUPPORTERD
Robbed Bit C or E
Voice-grade tie, DID, & Co trunks, OPS lines, connections to D4-channel banks, DSCs,
ACCUNET® switched digital
Proprietary C or E
24th Chan.AVD-tie trunks between System 85s and between System 85 and System 75½
DMI-BOS E24th Chan.Proprietary 24th-channel format applications plus connections to any endpoint conforming to
the AT&T Digital Multiplexed Interface Technical Specification. Examples include 3B5
hosts, HP3000 hosts, and IBM® IDNX multiplexers. These endpoints are called DMI-
BOS endpoints in these notes. Other vendor equipment is certified by AT&T for this
connectivity. Certified equipment requires an ANN11E at the System 85 end.½
Application issues about the ANN11C and ANN11E are summarized below.*
a.
b.
c.It is not necessary to administer a DMI trunk type (108 or 109) or set the Application Type in procedure 260
to DMI-BOS” to use DMI-BOS signaling. To get DMI-BOS, use an ANN11E and administer 24th-channel
signaling on the ANN11E by setting field 8 in procedure 260 to 0. This causes ANN11E firmware to use the
DMI-BOS signaling format for all trunk types administered on that ANN11E. The only exception is where an
ANN11E is connected to an ANN11C that is also administered for 24th-channel signaling (see item c below).
ANN11E provides both DMI-BOS and proprietary 24th-channel signaling types. However, these two signaling
types are not selectable via ANN11E administration. When administered for 24th-channel signaling, the ANN11E
defaults to DMI-BOS. However, an ANN11E may still be connected to an ANN11C. The ANN11E will
automatically determine when the ANN11C (or any other endpoint) is using proprietary signaling and switch to
proprietary 24th-channel signaling to maintain compatibility.
DMI trunk types 108 and 109 are intended for connections to DMI host computer endpoints and for ACCUNET
switched digital service. The primary difference of trunk types 108 and 109 is that they inhibit the use of “Data
Answer tone” on the trunk. Examples of applications requiring this are a DMI-BOS trunk to a host (which uses
DMI-BOS 24th channel signaling) or an ANN11 used for ACCUNET switched digital service access (which
requires robbed-bit signaling). Again, trunk types 108 and 109 are not the only trunk types that can provide
DMI-BOS signaling. This matters for non host DMI-BOS endpoints, such as the IBM IDNX multiplexer.
This multiplexer requires DMI-BOS 24th-channel signaling but is not a host. Therefore, the ANN11E that
terminates on an IDNX should be administered as any appropriate trunk type other than 108 or 109. Note that, at
present, DMIs are only certified for switch-to-host connectivity and not for switch-to-switch connectivity, which
appears to be the application of the IDNX multiplexer. This is now the only application of DMI that requires
trunk types other than 108 or 109.
d.
e.
f.
g.ANN11C may be used in any R2 switch supporting DS1 trunks. However, there is one caveat that applies to
switches supporting DMI host trunk types 108 and 109 (System 85 R2V3 and later). If the ANN11C is
administered for 24th-channel signaling, it will use the proprietary type. This means that it will work as long as
it is connected to a System 75 or System 85 but will not work if connected to another vendor’s DMI-BOS
endpoint using trunk type 108 or 109.½
½
Setting the “Application Type” field of procedure 260 to DMI-BOS prevents the associated ANN11 board
from being used as a clock reference by a system clock synchronizer. This is only useful when the ANN11
connects to a host. Here, the host loop times to the switch and cannot be used as a clock reference.
An ANN11D is equivalent to an ANN11E. The E suffix came from adding a fiber interface to the ANN11D.
However, the fiber connectivity was not pursued. ANN11Ds were produced in limited numbers for System 85
R2V4.½
The DMI-BOS signaling supported by ANN11E from System 85 R2V3 and later should not be confused with
DMI-MOS supported by ANN35 (Primary Rate Interface) from System 85 R2V4 and later.½
½
2.
3.The TN380B (module processor) and ANN11B (DS1) are manufacture discontinued (MD) and are not available for
R2V3 or later versions. For duplicated modules, both modules must always be equipped with the same type of module
processor, both modules must be equipped with the TN380C or TN380D circuit packs. (TN380D supersedes TN380C
and earlier in ISCN 249DR.)
The TN580 has all functions of the TN380D.
For R2V1 System 85s (version 1.5 or later software) and R2V2 System 85s (version 1.3 or later software) equipped
with the TN380C and ANN11C/D circuit packs, the following port types may also provide ground-start, FX, WATS,
RA, PBX/CO, and DID trunks via the DS1 facility.½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							6-4PORT TYPES/INSTALLATION COMPATIBILITIES
4.
5.
6.
7.
8.
9.The DMI-BOS is available with the ANN11D, ANN11E, and TN722B circuit packs. The ANN11D is only used on
some R2V4 CIs. The ANN11E supersedes the ANN11C as the production model. For System 85 and Generic 2,
DMI-MOS is available with the ANN35 circuit pack (traditional modules) and with the TN767 or TN555 circuit pack
(universal modules).
For Generic 1, DS1, CO, and foreign exchange (FX) with TN767.
The OPS line option is initially available with the TN380C, TN380D, ANN11C, ANN11D, and ANN11E circuit packs.
Therefore, the R2V3 software (or later version) is required for administration purposes (procedure 000).
System 85 R2V3 for analog DSC endpoints; System 85 R2V4 for added digital endpoints.
The dynamic trunk group includes CO trunk types (17, 27, and 30), tie trunk types (41, 42, 43, 46, and 47), as well as
DMI trunk types (108 and 109).
This requires an accompanying TN555 circuit pack to terminate the D-channel.½
½
½
½
½
Six different types of channel units may be used to provide drop or insert channels. The 4-wire E&M
tie trunk is compatible with DS1 tie trunks and may be used for the dedicated switch connection. The
All-Rate OCU Dataport — RS-232C (2.4, 4.8, 9.6K-bps) or V.35 (56K-bps) is compatible with an
identical channel unit when configured in a D4-channel bank. All other CDM channel units must
terminate at a distant CDM on the same channel with an identical channel unit. The emphasis here is
what is on one end must be compatible with what is on the other end, channel per channel.
The D4-channel bank is versatile. It may be used as customer-premises equipment to support both
circuit-switched (such as with a switch) and dedicated-line applications. The D4-channel banks can also
be used at an analog end office (class 5) or configured to provide both voice and data interfaces to a
digital toll office (4ESS).
Although the D4-channel bank is compatible with other devices using D4 standards, its most frequent
application (from this document’s perspective) is as the interface between a DIMENSION® and DS1 or
T1 facilities. The physical connections from the D4 to the switch are identical to connections used in
any 4-wire analog tie trunk connection. The 4-wire E&M-ER tie trunk should be used because these
units include variable attenuators in the range between 0 and 25.5 dB. Therefore, external attenuator
pads are not required. Since both analog and digital tie trunks are involved in the end-to-end link, the½
end-to-end transmission facilities (called a combination tie trunk).
GENERIC 1 DS1/DMI-BOS
The operating mode and supported port types for Generic 1 DS1/DMI-BOS are described next.½
Operating Mode
There are no special slot or option strap considerations for Generic 1 DS1/DMI, as with Generic 2. The½
TN722, TN722B, and TN767 plug into any normal port slot in the system.
Supported Port Types
The TN722 and TN722B only emulate tie-trunk signaling. That is, they provide 2-state signaling (on-
hook/off-hook signaling). Two categories of trunk types perform 2-state signaling: tie trunks and DMI
trunks.½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							PORT TYPES/INSTALLATION COMPATIBILITIES6-5
The TN767 circuit pack provides CO in addition to tie and DMI trunk types. That is, it provides 4-state
signaling (on-hook/off-hook signaling as well as ringing and no-ringing indication, and reverse battery).
NOTE: No restrictions are placed on the type of framing, signaling, or line-coding options used
with any of the port types. However, take care to assure that the interface options are compatible
with the distant endpoint (D4-channel banks are not now compatible with 24th-channel signaling;
most D4-channel banks do not support ESF framing).
Tie Trunk
Generic 1 DS1/DMI tie trunks appear to the switch software as a TN760B analog tie trunk. Therefore,
things that can be administered for a digital tie trunk can also be administered for an analog tie trunk
(except for alternate voice/data (AVD) common-type trunks).½
A tie trunk port presents an interface of a channel unit requiring tie trunk signaling to a far-end D4-
channel bank. Since six types of tie-trunk channel units use the same digital signaling format, there may
not be a one-to-one relationship between a DS1/DMI tie-trunk port and the channel unit on which it
terminates at a channel bank. The six types of channel units are types I, II, and III 2-wire E&M, and
types I, II, and III 4-wire E&M. While these channel units have the same digital interface, they differ in
their analog voice interfaces (2- or 4-wire) and in the type of E&M (analog) signaling to which
DS1/DMI signaling states are converted (type I, II, or III).½
½
A Generic 1 analog tie trunk is a 4-wire type I E&M trunk. Thus, a DS1/DMI tie-trunk port can be
considered to be the same, and a 4-wire type I channel unit (or its equivalent) could be used to interface
to a DS1/DMI tie-trunk port at the far end.½
It appears that any of the other five types of E&M channel units could be used as well, although this
capability has not been tested.
DMI Trunks
The DMI trunks are used to provide 64K-bps data connectivity to a host computer or to provide both
voice and 64K-bps data connectivity to private or public networks that support DMI-BOS signaling.
These trunks must be optioned for the DMI-BOS 24th-channel signaling format. The DMI specification
requires one of the four following trunk types: wink-in/wink-out, wink-in/auto-out, auto-in/wink-out,
and auto-in/auto-out though Generic 1 does not restrict other trunk types from being administered. These
trunk types are administered the same way as other trunk types.½
½
GENERIC 1 ISDN-PRI
All operating modes and supported trunk types of Generic 1 DS1/DMI-BOS are supported for Generic 1
ISDN-PRI. In addition, ISDN-PRI is available with a TN767. Refer to chapter 7, Administration
Options and Requirements, for specific administration information.½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							6-6PORT TYPES/INSTALLATION COMPATIBILITIES
SYSTEM 85 DS1, TRADITIONAL MODULES (ANN11)
The operating mode and supported port types for System 85 DS1 (ANN11) in traditional modules are
described next.½
½
Operating Modes
The two operating modes and grouping rules are described next.
Line-Only Mode
The line-only mode of a DS1 allows up to 24 analog stations (and optional modems) to be remoted½
through a DS1 facility. A D4-channel bank or its equivalent is required at the off-premises end.
NOTE: Each DSl/MFAT carrier may contain a maximum of four DS1 circuit packs that function
in line-only mode. These circuit packs may only be located in physical carrier slots 0, 5, 13, and
18. For a DS1 to function in line-only mode (rather than line+trunk mode), those slots containing
the DS1 circuit packs must be configured with an option strap. This strap connects backplane pins
208 and 224. For J58888N1 List 2 Modification C or later, the carrier is manufactured with the
strap always installed on slots 0 and 13. The strap may be field installed on slots 5 and 18, as
required.
In line-only mode, a DS1 provides the equivalent of three analog OPS circuit packs, each containing
eight ports. The line-only DS1 thus requires three carrier slots: one for the actual circuit pack and two
more as virtual slots. The term virtual is used to represent slots whose backplane signals are used by
the line-only mode DS1, but not physically occupied by the interface. Virtual slots result from a
physical limitation in the number of time slots that are available in each carrier slot.½
Only 8 time slots per carrier slot are available to OPS circuit packs. Since a DS1 uses 24 time slots, it
must use the time slots associated with the occupied carrier slot, plus those from 2 additional slots. The
two virtual slots associated with the real line-only mode DS1 always occupy the two carrier slots
immediately to the right of the real DS1.
These two virtual slots must be left vacant. Otherwise, circuit packs inserted in these slots
may be damaged along with the DS1.½
½
WARNING
A fully equipped carrier contains four line-only DS1s and has four other slots available for analog-type
circuit packs. These other slots are physical slot numbers 3, 8, 16, and 21. Therefore, a single carrier
can provide up to 96 digital OPS ports. Figure 6-1, Physical and Virtual Carrier Slot Relationships,
Line-Only Mode, shows the carrier slots, physical versus virtual slot locations, and their relationship to
OPS port numbers.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							PORT TYPES/INSTALLATION COMPATIBILITIES6-7
Line+Trunk Mode
The line+trunk mode of a DS1 provides the capability of mixing both lines and trunks on the same DS1
facility.
The DS1 works (by default) in line+trunk mode, unless the backplane strap is configured. Here, a DS1
provides the equivalent of six analog circuit packs, each providing four ports. The line+trunk DS1 thus
requires six slots: one for the actual circuit pack and five as virtual slots. Virtual slots mean the same
thing for line+trunk mode as they do for the line-only interface with one variation: virtual slots provide
four ports for the line+trunk mode versus eight ports for the line-only mode.
System 85 hardware allows a maximum of four trunk circuits per slot. Therefore, line+trunk mode only
uses four backplane time slots from each of the six carrier slots. Thus, a maximum of four OPS ports
may be administered for any one of the virtual (or actual) slots.
A maximum of two line+trunk circuit packs may be configured in each carrier. They may only be
placed in slots 5 and 18. Therefore, with line+trunk mode, the carrier will support a maximum of 48
digital trunks or 48 OPS ports. Virtual slots are the leftmost three slots of the left quarter and the two
slots immediately to the right of the real DS1 in the right quarter of the half carrier in which the DS1 is
contained. These virtual board locations must be left vacant or damage to a port board and the DS1
could result.
A carrier equipped with two line+trunk DS1s will have four slots available for other port boards in
physical slots 3, 8, 16, and 21. Figure 6-2, Physical and Virtual Carrier Slot Relationships, Line+Trunk
Mode, shows the carrier slots, physical versus virtual slot locations, and their relationship to line+trunk-
mode use.
Because line+trunk mode requires six carrier slots while line-only mode requires only three, mode
selection is not made a software configurable option.½
½
½
*
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							6-8PORT TYPES/INSTALLATION COMPATIBILITIES
SLOT NUMBERS
0
51
62
73
8LEFT HALF CARRIER
13
1814
1915
2016
21RIGHT HALF CARRIER
LINE-ONLY
ANY
OTHER
EMPTYEMPTY
DS1 OR DMI
INTERFACE
PORT
CIRCUIT
PACK
EQUALS
EQUALS
ACTUAL
OPS
#1
(NOTE)VIRTUAL
OPS
#2
VIRTUAL
OPS
#3OTHER
CIRCUIT
PACKS
OPS PORTS/CARRIER SLOT
OPS #0
OPS #1
OPS #2
OPS #3
OTHERS
EQUALS
OPS #4
OPS #5
OPS #6
OPS #7
NOTE: Any half carrier that does not contain a line+trunk mode circuit pack
can have 1 or 2 functioning line-only modes.
Figure 6-1. Physical and Virtual Carrier Slot Relationships, Line-Only Mode
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7. ADMINISTRATION OPTIONS AND REQUIREMENTS
Administering DS1/DMI/ISDN-PRI services involves configuring the software translations to know what
the equipment-carrier configuration and circuit pack types are and what services are to be done.
For System 85 R1 through R2V3, switch administration may be done from the system-management
terminal (SMT), maintenance and administration panel (MAAP), or Remote Maintenance,
Administration, and Traffic System (RMATS)-II. A System 85 R2V4 includes an additional
administration terminal known as the visual maintenance and administration panel (VMAAP). These
administration terminals use flipchart procedures.½
½
½
NOTE: Although flipchart procedures are used for System 85 administration, Manager II screens
are shown instead of the actual flipcharts. Field numbers for the Manager II screens are exact
correlations to field numbers for flipchart procedures.½
½
½
Generic 2 is significantly different and may only be administered via a MS-DOS® based computer
running the Manager II applications software. The Manager II applications software provides three
modes of operation. The modes are called:½
l
l
lBasic mode
Enhanced mode
Task mode
The enhanced mode consists of fill-in-the-blank screen-display procedures that contain many of the same
fields as the flipchart procedures. However, with enhanced mode, each screen-based procedure provides
a user-friendly interface with optional pop-up help instructions. Therefore, with Manager II, Generic 2 is
administered similarly to System 75, System 75XE, and Generic 1.½
Because Generic 2 administration is significantly different from previous System 85 releases and
versions, this administration section contains a separate heading that includes descriptions on how to
administer DS1/DMI/ISDN-PRI services for Generic 2.½
½
For System 85, administering DS1/DMI-BOS/DMI-MOS simply consists of translating procedures 250,
260, and 116. Being familiar with administering these procedures is a good starting point for
understanding the options and requirements of ISDN-PRI. Administrating ISDN-PRI uses procedures
250, 260, 116, plus several additional procedures.½
Some applications (such as off-premises station or OPS) may also require that other additional
procedures be administered.
7-1
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-2ADMINISTRATION OPTIONS AND REQUIREMENTS
Generic 1 may be administered from a Manager I terminal or by the Initialization and Administration
System (INADS). Generally, the administration procedures consist of executing the proper
administration and maintenance commands (from the command line feature set) and translating, in the
required order, the following screen-based forms:½
l
l
l
l
lDS1 circuit pack
Sync-plan
DMI-BOS (when required)
Trunk group (as required)
Trunk member assignments (as required)
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4