TN464C, D, E, F Option Settings
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:
■
■Administrable
■Cyclical redundancy checking (CRC) 4 check
■Stratum 3 clock compatibility
■
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
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 |
|
|
|
September 1995 Issue 1
