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Section 61200102L1-2, Issue 3
Section 61200102L1-2
Issue 3, May 1995
CLEI Code # 5SC3DD0 _ _ _PRACTICES
61200.102L1-2C
SLC-5 NULL
ISDN 2B1Q INTERFACE
DESCRIPTION
Figure 1. ADTRAN SLC-5 NULL Card
Unit
Part No.
Features
Table A. Basic Features
Accompanies SLC-5 U-BR1TE in
2B+D operation.
FAIL LED indicates proper
activation.
Allows non-ISDN ready SLC-5
configurations to use SLC-5
ISDN U-BR1TE.
Provides a four signal serial
communication interface to the
SLC-5 bank controller.
1200102L1
SLC-5
NULL
The NULL card occupies the adjacent physical
slot of a SLC-5 U-BR1TE (unless already occupied by
a SLC-5 U-BR1TE) that is provisioned for NULL 2B+D.
Consequently, only one NULL card is required per tri-
slot group. Three time slots are required for transport
of 2B+D information.
1. GENERAL
1.1 This practice provides an overall description
of the ADTRAN SLC
®
-5 NULL card. Figure 1 is a
photograph of the NULL card. Part numbers and basic
features for the NULL are provided in Table A.
1.2 Issue 2 of this practice revised subsections
1.3, 1.4, and Table C. Issue 3 adds the CLEI code.
1.3 The SLC-5 NULL card is designed to operate
with AT&T SLC Series 5 equipment. The ADTRAN
SLC-5 U-BR1TE is given access to the two time slots
associated with its physical position in the bank; see
ADTRAN SLC-5 U-BR1TE practices, Sections
61100040L1-5 and 61100040L1-2, for more
information.
SLC is a registered trademark of AT&T.
CONTENTS
1. GENERAL ......................................................................... 1
2. PHYSICAL DESCRIPTION ............................................. 2
3. DESIGN DESCRIPTION .................................................. 2
4. INTERFACE REQUIREMENTS ..................................... 2
5. TESTING ........................................................................... 3
6. SPECIFICATIONS ............................................................ 3
7. REFERENCES................................................................... 3
FIGURES
Figure 1. ADTRAN SLC-5 NULL Card.................................. 1
Figure 2. ADTRAN SLC-5 NULL Card Installation
Examples................................................................... 2
Figure 3. SLC-5 NULL Card Faceplate ................................... 2
Figure 4. SLC-5 NULL Card Block Diagram.......................... 3
TABLES
Table A. Basic Features ............................................................ 1
Table B. ISDN Equipped Banks versus NULL Card
Requirements ............................................................. 2
Table C. NULL Card Specifications ....................................... 3
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Section 61200102L1-2, Issue 3
1.4 The ADTRAN SLC-5 NULL Card is a line card
for use in AT&T SLC Series 5 central office terminals
(COTs) or in SLC Series 5 remote terminals (RTs) that
are not ISDN ready (see Table B). The NULL card is
only required when an ADTRAN SLC-5 U-BR1TE is
provisioned as NULL 2B+D. The NULL card must then
occupy the adjacent physical slot unless occupied by
another SLC-5 U-BR1TE.
Table B. ISDN Equipped Banks versus
NULL Card Requirements
Location
RT
RT
COT
COT
RT
RT
RT
Any
BCU
MC97724A1
MC97724A1B
MC97755A12
MC97755A1BI1:1
MC97771A1
MC97776A1
MC97776A1BI1:1
Any previous not listed
NULL Card
Requirement
Yes
No
Yes
No
No
Yes
No
Yes
S1-1
Setting
On
Off
On
Off
Off
On
Off
On
2. PHYSICAL DESCRIPTION
2.1 The SLC-5 NULL card plugs into a single SLC-
5 channel slot. Figure 2 shows placement examples
for the ADTRAN SLC-5 NULL card.
2.2 Figure 3 is an illustration of the ADTRAN SLC-
5 NULL card faceplate. There is one LED on the
front panel of the ADTRAN SLC-5 NULL card. The
FAIL LED indicates the status of the allocation of
additional time slots to the NULL card by the BCU.
The FAIL LED remains
On
until the BCU allocates
the additional time slots. The FAIL LED turns
Off
when
the additional time slots have been allocated.
123456789101112
1/2
Physical slot
Time slot
3/4 5/6 7/8 9/10 11/12 13/14 15/16 17/18 19/20 21/22 23/24
SLC-5
U-BR1TE
2B+D
SLC-5
U-BR1TE
2B+D
NULL
SLC-5
U-BR1TE
2B+D
SLC-5
U-BR1TE
2B+D
NULL
SLC-5
U-BR1TE
2B+D
NULL
EMPTY
OR
OTHER
SERVICE
SLC-5
U-BR1TE
1B+D
SLC-5
U-BR1TE
1B+D
EMPTY
OR
OTHER
SERVICE
Figure 2. ADTRAN SLC-5 NULL Card Installation Examples
NULL
FAIL
1200102L1
Figure 3. SLC-5 NULL Card Faceplate
3. DESIGN DESCRIPTION
The SLC-5 Null Card provides a four signal
serial communication interface to the SLC series 5
BCU. Through this interface, the unit informs the BCU
that the SLC-5 NULL card is a plain old telephone
service (POTS) card requesting the time slots
allocated to the physical location to which it is plugged
in.
4. INTERFACE REQUIREMENTS
The ADTRAN SLC-5 NULL card design
interfaces with the SLC-5 bank controller as illustrated
in Figure 4.
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Section 61200102L1-2, Issue 3
901 Explorer Boulevard • Huntsville, Alabama • 35806-2807 • (205) 971-8000 • FAX (205) 971-8699
Processor
Bank
Controller
I/F
SLC-5
Bank
Controller
Unit
(BCU)
Address/Data
Bus
MSG
NMQ
NMP
Backplane
Connector
NSR
+5
Figure 4. SLC-5 NULL Card Block Diagram
5. TESTING
The ADTRAN SLC-5 NULL card requires no
testing. The FAIL LED located on the front panel of
the NULL card indicates the operational status of the
unit (see subsection 2.2).
6. SPECIFICATIONS
6.1 The specifications for the SLC-5 NULL card
are listed in Table C.
7. REFERENCES
7.1 For more SLC-5 NULL card information, refer
to ADTRAN SLC-5 NULL Installation/Maintenance
Practice, Section 61200102L1-5, ADTRAN Schematic
2200.102-1, and ADTRAN faceplate drawing number
3260.1530.
Table C. NULL Card Specifications
Facility Interface
Interfaces only with the SLC-5 channel bank controller
Faceplate Controls and Indicators
Controls: None
Indicators: FAIL LED to display proper operation
Tests: None
Mechanical
Size: 10.69" Long, 3.75" High, 0.65" Wide
Weight: 4.5 oz, nominal
Mounting: Mounts in AT&T SLC Series 5
channel banks
Power
Current Drain On-card dissipation
+5V 23
m
A
Environmental
Temperature: Operating: -40°C to +70°C
Storage: -40°C to +85°C
Relative Humidity: Up to 95% non-condensing
/