User guide

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NT9X49CC — This message switch (MS) processor-bus (P-bus) termina-
tor card, located only in the combined MS of the SNSE, provides termina-
tion for message switch backplane tracks primarily used by the message
switch processor (MSP). This pack provides a time-out on the MS transac-
tion bus (T-bus). The time-out on the MS T-bus is longer for the
NT9X49CC than for the NT9X49CA.
NT9X52AA — This message switch processor (MSP) transaction
bus (T-bus) access card, located within the SN and SNSE MS shelves, pro-
vides the IF between MSP and T-bus within the MSP.
NT9X53AA/AB or AD — This SN message switch system clock card
generates accurate timing signals from two digital phase-locked loops
(DPLL) that use Stratum 3 oscillators. The NT9X53AC and AD cards are
combined clock cards.
NT9X54AA — This DMS-bus clock interface paddle board provides ext.
cable connections for the NT9X53AA card (MS clock).
NT9X54AC — This external clock interface paddle board provides the
appropriate interfaces to convert remote and external analog reference sig-
nals to transistor-transistor logic (TTL) levels acceptable by the system
clock circuit card. NT9X54AD is Japan version.
NT9X62AA — This two-port subrate DS512 paddle board provides the
appropriate interfaces to convert remote and external analog reference sig-
nals to transistor-transistor logic (TTL) levels acceptable by the system
clock circuit card. The NT9X62BA is the four-port version and the
NT9X62CA is the SR-512 version.
NT9X63AA or BA
— This OC-3 interface paddle board is used to connect
the CMIC links (OC-3) between MS & XA-core NTLX05 CMIC packlet.
NT9X69AA — The NT9X69AA is a 16 port DS30 link interface paddle
board, which provides DS30 links between the message switch and the
existing DS30-based junctor networks (JNET). It interfaces to the
NT9X17DA or CA to provide a high-density DS30 interface capability
when retrofitting JNETs with enhanced network (ENET) in large offices.
NT9X73AA or BA — This local message switch (LMS) to F-bus rate
adapter (RA) card is used in a link interface module (LIM) to transfer pack-
ets from the 32-bit LMS transaction bus (T-Bus) to the 8-bit frame trans-
port bus (F-bus) and from the 8-bit F-bus to the 32-bit LMS T-bus. All link
interface units (LIU7) sit on the F-bus, which is duplicated for reliability.
NT9X74AA — The Frame transport bus (F-bus) repeater card, located
within the LIU7 shelves, reclocks and repeats all F-bus correspondence
between the intershelf F-bus and the intrashelf F-bus. The NT9X74BA ver-
sion of the repeater card is similar to the AA version with the exception that
the far-end F-bus terminations have been removed and placed on the
NTEX20AA and BA. The NT9X74CA version of the repeater card is sim-
ilar to the BA version with the added firmware function of querying the
identification (ID) PROM of the NTEX20AA and BA. The NT9X74DA
supersedes the NT9X74CA by adding channel bus (C-bus) terminations for
link peripheral processor (LPP) channel access.
NT9X75AA — This processor bus (P-bus) to frame transport bus (F-bus)
interface (PFI) card is a component of the signal transfer point (STP) link
interface unit (LIU7). It provides an interface between P-bus & both
instances of the F-bus (F-bus A & F-bus B).
NT9X76AA or BA — The signaling terminal (ST) card, located within the
link interface shelf, is a single board with two processors that handle the
data link level functions of the CCS7 protocol. The signaling transfer point
(STP) connects to each CCS7 link through an ST card. The NT9X76CA is
for the Japanese market.
NT9X77AA — The NT9X77AA paddle board, like the following NT9X78
PB, provides the electrical interface between the LIU and the CCS7 signal-
ling link (SL).
NT9X78AA thru DA — These DS-0A interface paddle boards are con-
tained in the link interface unit (LIU7) of the link interface modules of the
signaling transfer point (STP) switch or the SNSE ENET shelves when
equipped with LIUs. The DS-0 interface provides layer-1 functions such
as level shifting drivers/receivers between the signaling terminal (ST) and a
digital line.
NT9X79AA or BA — NT9X79AA is a frame transport bus (F-bus) exten-
sion paddle board. Both are located behind the NT9X74 (F-bus repeater
card) in the top and middle link interface shelves (LIS) of the link interface
module (LIM). The NT9X79BA is located behind the NT9X73AA (rate
adaptor) in the LMS shelf.
NT9X84 — The ethernet interface card provides temporary storage for
incoming/outgoing (I/O) link messages and protocol management and
handshaking for Ethernet CSMA/CD. It generates proper voltage and
impedance levels to drive standard twisted pair drop cable signal lines.
NT9X85AA or BA — The attachment unit interface (AUI) PB is a 15-pin
D-type connector that provides the interface between the Ethernet control-
ler and the media access unit (MAU). This is the most generic interface and
supported as an industry standard (IEEE 802.3 10Base5 implementation).
Note: This interface is compatible with all implementations of Ethernet
through external equipment. The unshielded twisted pair BA version con-
tains a UTP MAU and hub integrated onto the paddle board. The card pro-