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TN464C, D, E, F Option Settings
September 1995 Issue 1
H-41
TN464C, D, E, F Option Settings
The TN464 circuit pack interfaces between a 24 or 32 channel Central Office
(CO)/Integrated Services Digital Network (ISDN) or tie trunk and the Time
Division Multiplex (TDM) bus.
The TN464C and TN464D act as Digital Service Level 1 (DS1)/E1 interfaces and
Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI)
interfaces and have the following attributes:
■ 1,544-megabits per second (Mbps) Digital Service Level 1 (DS1) (24
channel integrated services digital network (ISDN)) and 2.048 megabits
per second Mbps) E1 (32-channel Integrated Services Digital Network
(ISDN)) transmission rates
■ Administrable A-law companding and Mu-law companding
■ Cyclical redundancy checking (CRC) 4 check
■ Stratum 3 clock compatibility
■ D-channel connectivity for Integrated Services Digital Network (ISDN)
primary rate interface (PRI)
The TN464D is a superset of the TN464C and has the following additional
attributes: supports digital release link tie trunks and MFC, R2 Direct Inward
Dialed (DID) signaling. In addition to supporting tie trunk, Central Office (CO)
trunk, and Direct Inward Dialed (DID) trunk protocols, the TN464D supports
bit-oriented signaling protocols and bit-oriented Direct Inward Dialed (DID)
signaling protocols.
The TN464C and TN464D have the following signal leads: LBACK2, LBACK1,
LO, LO (out), LI, LI (in to Private Branch Exchange (PBX)).
TN464C/D Option Settings
To choose the bit rate and the line impedance match, set plugs (TN464 C & D)
on the circuit pack. Insert the jumper blocks into the pins to join the center row of
pins and the row designating the desired options.
Set the impedance and bit rate as follows:
Table H-30. Option Switch and/or Plug Settings on TN464C/D
120 Ohms Twisted Pair
75 Ohms Coaxial requiring 888A adapter
32 Channel 2.048 megabits per second
24 Channel 1.544 megabits per second