User guide

72
Circuit Pack Descriptions
Note: The following circuit pack descriptions are for most of the packs
shown within the various hardware shelves in this QRG.
NTAX78AB or BA — The Enhanced time switch (ETS) card is function-
ally equivalent to the NT6X44CA time switch card. As of NA003, the
NTAX78 replaces the NT6X44 that will implement DTA for ESMU or
SMA. As of NA004, SMA interfacing TR-303 compliant terminals require
the NTAX78 card. The ETS card is required to perform ISDN DTA func-
tions on an ESMU or any subtending RCU ISDN lines.
NTBX01AB — This enhanced ISDN card is a redesign of the ISDN sig-
naling pre-processor (ISP) card. Memory size and processor speed have
been increased to meet changing system requirements. The card provides
interfaces both to the signaling processor (SP) and to the speech bus. It ter-
minates a single messaging link for each D-channel handler (DCH) and
processes layer-3 information. Signaling information that is extracted by
the DCH is sent to the master processor (MP) by way of the enhanced
ISDN signaling pre-processor (EISP).
NTBX02 — The D-channel handler card is the main interface to all
D-channels through the speech bus. The DCH sets up communication with
an ISDN terminal on request from the terminal or the line group controller
(LGC) master processor (MP). NTBX02BA is an enhanced DCH card.
NTBX34 —This LCME Processor card is responsible for processing asso-
ciated with scanning the line cards for calls, setting up call connections
through the digroup controller card (NTBX35) and DMS-X messaging
with the Host. This card also carries out background tasks for diagnostics.
It is also located in the SRU.
NTBX35
—The LCME Digroup Controller card provides time switching
for external and internal channel assignments, and provides digital loop
around paths. It also interface with the Link Control Card (LCC) and the
Line Drawers. It is also located in the SRU.
NTBX36
—This is the Bus Interface Card (BIC) for ISDN LCME and is
located in the Line Drawer.
NTBX72 — The ISDN enhanced LCME battery and ringing router card
monitors the current of various ANI/COIN inputs selected by a multiplexer
(MUX) circuit.
NTDX15AA — This +/-5V power converter provides a regulated and pro-
tected nominal output of +5.15 V and -5.2 V. The maximum current avail-
able on the positive output is determined by the negative output load. At
no load, up to 69 Amps can be drawn from the positive rail; at -10 A, up to
55 Amps can be drawn from the positive rail. This pack supports the fol-
lowing products: high-speed interface (HSI); network programming plat-
form (NPP); channel frame processor (CFP). It can be used in the SNSE
CM/SLM shelf.
NTDX15AB is the global +/-5V power converter.
NTDX16AA
— The +5V dual power converter can provide full redun-
dancy for an LPP/LIS shelf. If one NTDX16 power converter fails, or
requires power-down or replacement, the other NTDX16 power converter
supplies power for the entire LPP or LIS shelf.
NTDX91 — A dual power converter used in the file processor (FP) storage
device shelf.
NTEX17 — The AA card is a 1 Meg Modem line card that provides for
data networking as well as a POTS interface. The CA and DA cards are
xDSL line cards that provide full voice service and high-speed data com-
munications in the 1-Meg Modem Service. The DA is used for the RLCM
and STAR remotes and works only with the NTEX54CA DBIC card.
NTEX20 —The intra F-bus terminator PBs (NTEX20AA and
NTEX20BA) provide intrashelf F-bus termination. NTEX20AA provides
intrashelf termination for F-bus (A) 0 signals. NTEX20BA provides
intrashelf termination for F-bus (B) 1 signals.
NTEX22 — The integrated processor & F-bus interface card (IPF) pro-
vides a LIU7 link general processor, a dual F-bus interface capability, and
is used for LIUs, EIUs, FRIUs, and NUIs. It replaces the NT9X13CA link
general processor and the NT9X75AA F-bus to F-bus interface. In regard
to the LIU7, the NTEX22BA card is optional in North America, but is
required in the United Kingdom. The NTEX22BA is functionally identical
to the NTEX22AA, except that the BA card has 8 Mbytes of DRAM. The
AA card is no longer supported. The upgrade NTEX22BB is functionally
identical to the NTEX22AA and BA cards except that the BB card supports
32-bit asynchronous P-bus slaves and spared peripherals. The NTEX22CA
is a 32MB LIU7 Integrated Processor that provides 2.5 to 2.7 times the
capacity of the 8MB LIU7. The FA version is a 128MB card.
NTEX25 — The NTEX25AA network interface unit (NIU) channel bus
controller (CBC) card in the link peripheral processor (LPP) allows direct
network connection to the LPP. The NTEX25AA takes channels from the
network and transmits them to the application specific units (ASU) over the
C-bus, and takes channels from the ASUs via the C-bus and transmits them
to both planes of the network. The NIU is a hot standby. Unit 0 uses the
NTEX25AA, which interfaces to C-bus 0 and Unit 1 uses the NTEX25BA,
which interfaces to C-bus 1.