Rainbow Electronics DS2141A - Manual (Page 20)

DS2141A
021997 20/35
TTR1/TTR2/TTR3: TRANSMIT TRANSPARENCY REGISTERS (39h to 3Bh)
(MSB) (LSB)
CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1
CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9
CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17
SYMBOL POSITION NAME AND DESCRIPTION
CH24 TTR3.7 Transmit Transparency Registers.
CH1 TTR1.0 0=this DS0 channel is not transparent.
1=this DS0 channel is transparent.
Each of the bit positions in the Transmit Transparency
Registers (TTR1/TTR2/TTR3) represents a DS0 chan-
nel in the outgoing frame. When these bits are set to a 1,
the corresponding channel is transparent (or clear). If a
DS0 is programmed to be clear, no robbed bit signaling will be inserted nor will the channel have Bit 7 stuffing
performed. However, in the D4 framing mode, bit 2 will
be overwritten by a 0 when a Yellow Alarm is trans-
mitted.
TIR1/TIR2/TIR3: TRANSMIT IDLE REGISTERS (3Ch to 3Eh)
(MSB) (LSB)
CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1
CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9
CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17
SYMBOL POSITION NAME AND DESCRIPTION
CH24 TIR3.7 Transmit Idle Registers.
0=do not insert the Idle Code into this DS0 channel.
CH1 TIR1.0 1=insert the Idle Code into this channel.
TIDR: TRANSMIT IDLE DEFINITION REGISTER (3Fh)
(MSB) (LSB)
TIDR7 TIDR6 TIDR5 TIDR4 TIDR3 TIDR2 TIDR1 TIDR0
SYMBOL POSITION NAME AND DESCRIPTION
TIDR7 TIDR.7 MSB of the Idle Code.
TIDR0 TIDR.0 LSB of the Idle Code.
Each of the bit positions in the Transmit Idle Registers
(TIR1/TIR2/TIR3) represents a DS0 channel in the out-
going frame. When these bits are set to a 1, the corre-
sponding channel will transmit the Idle Code contained in the Transmit Idle Definition Register (TIDR). Robbed
bit signaling and Bit 7 stuffing will occur over the pro-
grammed Idle Code unless the DS0 channel is made
transparent by the Transmit Transparency Registers.
TTR1 (39)
TTR2 (3A)
TTR3 (3B)
TIR1 (3C)
TIR2 (3D)
TIR3 (3E)